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entitled 'The Federal Government's Long-Term Fiscal Outlook: Spring 
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United States Government Accountability Office: 
GAO: 

The Federal Government's Long-Term Fiscal Outlook: 

Spring 2013 Update: 

GAO-13-481SP: 

Side bar: 

GAO's Long-Term Fiscal Simulations: 

Since 1992, GAO has published long-term fiscal simulations showing 
federal deficits and debt under different sets of policy assumptions. 
GAO developed its long-term model in response to a bipartisan request 
from members of Congress concerned about the long-term effects of 
fiscal policy. GAO's simulations provide context for consideration of 
policy options. They are not intended to suggest particular policy 
choices or to predict the economic impact of any set of choices but to 
help facilitate a dialogue on this important issue. 

GAO regularly updates its simulations as new data become available. 
This update incorporates the Congressional Budget Office's (CBO) most 
recent 10-year baseline projections, which include the effects of the 
American Taxpayer Relief Act (ATRA) of 2012 enacted earlier this year. 
As in the past, GAO shows two simulations, which differ in the 
following ways: 

The Baseline Extended simulation follows CBO's February 2013 baseline, 
which generally reflects current law for the first 10 years. The 
baseline includes the effects from the discretionary spending limits 
and automatic enforcement procedures put in place by the Budget 
Control Act (BCA) of 2011. After 2023, this fiscal constraint is 
maintained; revenue and spending other than interest on the debt and 
large entitlement programs (Social Security, Medicare, and Medicaid) 
are held constant as a share of GDP. Over the long term, revenue as a 
share of GDP is higher and discretionary spending lower than 
historical averages. 

In the Alternative simulation, expiring tax provisions, such as the 
research and experimentation tax credit, are extended to 2023; 
revenues are then brought back to the historical average as a share of 
GDP. For the first 10 years, discretionary spending reflects the 
original caps set by the BCA but not the lower caps triggered by the 
automatic enforcement procedures. Over the long term, discretionary 
spending and revenue are held at historical averages. 

The Baseline Extended simulation follows the Social Security and 
Medicare Trustees' (Trustees) 2012 intermediate projections and CBO's 
June 2012 long-term projections for Medicaid adjusted to reflect 
excess cost growth consistent with the Trustees' Medicare projections. 
In the Alternative simulation, Medicare spending is based on the 
Centers for Medicare & Medicaid Services Office of the Actuary's (CMS 
Actuary) alternative projections that assume reductions in Medicare 
physician rates do not occur as scheduled under current law and that 
certain cost-containment mechanisms intended to slow the growth of 
health care costs are not sustained over the long term. GAO also shows 
the outlook using CBO's long-term projections for Social Security and 
the major health entitlements; the results are consistent with GAO's 
simulations based largely on the Trustees' projections. 

Additional information on the fiscal outlook and federal debt is 
available at [hyperlink, http://www.gao.gov/special.pubs/longterm/]. 

For more information, contact Susan J. Irving at (202) 512-6806 or 
irvings@gao.gov or Thomas J. McCool, at (202) 512-2642 or 
mccoolt@gao.gov. 

[End of side bar] 

The Federal Government's Long-Term Fiscal Outlook: 
Spring 2013 Update: 

Our long-term simulations continue to highlight the need to focus 
attention not only on the federal government's near-term budget 
outlook but also on its longer-term fiscal path. In the near term, 
deficits are expected to continue to decline from the recent historic 
highs as the economy recovers and actions taken by Congress and the 
President begin to take effect. Debt held by the public as a share of 
gross domestic product (GDP), however, remains well above historical 
averages. Debt held by the public at these high levels could limit the 
federal government's flexibility to address emerging issues and 
unforeseen challenges such as another economic downturn or large-scale 
natural disaster. Furthermore, in both the Baseline Extended and 
Alternative simulations, debt held by the public continues to grow as 
a share of GDP in the coming decades, indicating that the federal 
government remains on an unsustainable long-term fiscal path (see 
figure 1). Rising debt in both simulations is driven by a fundamental 
imbalance between revenue and spending, which, on the spending side, 
is driven by the aging of the population and rising health care costs. 
Significant action to change the long-term fiscal path must be taken 
soon to minimize the risk that eventual policy changes will be 
disruptive to individuals and the economy, while also taking into 
account concerns about near-term economic growth. 

Figure 1: Debt Held by the Public under Two Fiscal Policy Simulations: 

[Refer to PDF for image: multiple line graph] 

Percent of GDP: 

Historical high: 109% in 1946. 

Fiscal year: 2000; 
Baseline extended: 34.7%; 
Alternative: 34.7%. 

Fiscal year: 2001; 
Baseline extended: 32.5%; 
Alternative: 32.5%. 

Fiscal year: 2002; 
Baseline extended: 33.6%; 
Alternative: 33.6%. 

Fiscal year: 2003; 
Baseline extended: 35.6%; 
Alternative: 35.6%. 

Fiscal year: 2004; 
Baseline extended: 36.8%; 
Alternative: 36.8%. 

Fiscal year: 2005; 
Baseline extended: 36.9%; 
Alternative: 36.9%. 

Fiscal year: 2006; 
Baseline extended: 36.6%; 
Alternative: 36.6%. 

Fiscal year: 2007; 
Baseline extended: 36.3%; 
Alternative: 36.3%. 

Fiscal year: 2008; 
Baseline extended: 40.5%; 
Alternative: 40.5%. 

Fiscal year: 2009; 
Baseline extended: 54.1%; 
Alternative: 54.1%. 

Fiscal year: 2010; 
Baseline extended: 62.9%; 
Alternative: 62.9%. 

Fiscal year: 2011; 
Baseline extended: 67.8%; 
Alternative: 67.8%. 

Fiscal year: 2012; 
Baseline extended: 72.5%; 
Alternative: 72.5%. 

Fiscal year: 2013; 
Baseline extended: 76.3%; 
Alternative: 76.5%. 

Fiscal year: 2014; 
Baseline extended: 77.7%; 
Alternative: 79%. 

Fiscal year: 2015; 
Baseline extended: 76.3%; 
Alternative: 78.9%. 

Fiscal year: 2016; 
Baseline extended: 74.6%; 
Alternative: 78.2%. 

Fiscal year: 2017; 
Baseline extended: 73.4%; 
Alternative: 78%. 

Fiscal year: 2018; 
Baseline extended: 73.1%; 
Alternative: 78.9%. 

Fiscal year: 2019; 
Baseline extended: 73.5%; 
Alternative: 80.5%. 

Fiscal year: 2020; 
Baseline extended: 74.2%; 
Alternative: 82.3%. 

Fiscal year: 2021; 
Baseline extended: 75%; 
Alternative: 84.3%. 

Fiscal year: 2022; 
Baseline extended: 76%; 
Alternative: 86.5%. 

Fiscal year: 2023; 
Baseline extended: 77%; 
Alternative: 88.7%. 

Fiscal year: 2024; 
Baseline extended: 78.2%; 
Alternative: 91.7%. 

Fiscal year: 2025; 
Baseline extended: 80%; 
Alternative: 95.5%. 

Fiscal year: 2026; 
Baseline extended: 82.1%; 
Alternative: 100%. 

Fiscal year: 2027; 
Baseline extended: 84.7%; 
Alternative: 105.3%. 

Fiscal year: 2028; 
Baseline extended: 87.8%; 
Alternative: 111.4%. 

Fiscal year: 2029; 
Baseline extended: 91.1%; 
Alternative: 118.1%. 

Fiscal year: 2030; 
Baseline extended: 94.7%; 
Alternative: 125.3%. 

Fiscal year: 2031; 
Baseline extended: 98.4%; 
Alternative: 132.9%. 

Fiscal year: 2032; 
Baseline extended: 102.3%; 
Alternative: 140.9%. 

Fiscal year: 2033; 
Baseline extended: 106.3%; 
Alternative: 149.2%. 

Fiscal year: 2034; 
Baseline extended: 110.4%; 
Alternative: 157.7%. 

Fiscal year: 2035; 
Baseline extended: 114.7%; 
Alternative: 166.4%. 

Fiscal year: 2036; 
Baseline extended: 119.2%; 
Alternative: 175.5%. 

Fiscal year: 2037; 
Baseline extended: 123.9%; 
Alternative: 184.8%. 

Fiscal year: 2038; 
Baseline extended: 128.6%; 
Alternative: 194.3%. 

Fiscal year: 2039; 
Baseline extended: 133.4%. 

Fiscal year: 2040; 
Baseline extended: 138.4%. 

Fiscal year: 2041; 
Baseline extended: 143.3%. 

Fiscal year: 2042; 
Baseline extended: 148.4%. 

Fiscal year: 2043; 
Baseline extended: 153.5%. 

Fiscal year: 2044; 
Baseline extended: 158.9%. 

Fiscal year: 2045; 
Baseline extended: 164.3%. 

Fiscal year: 2046; 
Baseline extended: 169.9%. 

Fiscal year: 2047; 
Baseline extended: 175.7%. 

Fiscal year: 2048; 
Baseline extended: 181.5%. 

Fiscal year: 2049; 
Baseline extended: 187.5%. 

Fiscal year: 2050; 
Baseline extended: 193.5%. 

Fiscal year: 2051; 
Baseline extended: 199.6%. 

Source: GAO. 

Note: Data are from GAO's Spring 2013 simulations based on the 
Trustees' assumptions for Social Security and the Trustees' and the 
CMS Actuary's assumptions for Medicare. 

[End of figure] 

The timing and the pace of the debt build-up--and therefore the size 
of action needed to address it--depend on the specific assumptions 
used. In the Baseline Extended simulation, which reflects the 
continuation of current law, debt as a share of GDP declines in the 
short term before turning up again. In the Alternative simulation, 
which assumes historical trends and policy preferences continue, 
federal debt as a share of GDP grows rapidly throughout the period. 

The key change in this update is the enactment of ATRA, which, among 
other changes, permanently extended many of the tax provisions that 
were previously set to expire under current law and limited the reach 
of the Alternative Minimum Tax. As a result, revenue in our Baseline 
Extended simulation is lower as a share of GDP than it was in the Fall 
2012 Baseline Extended simulation but remains higher than the 40-year 
historical average after 2013. In contrast, revenue increased in the 
first 10 years of the Alternative simulation as a result of changes in 
tax rates for high-income taxpayers enacted in ATRA. After the first 
10 years, however, the Alternative simulation phases into the 40-year 
historical average for revenue. Therefore, the overall effects of ATRA 
on the longer-term outlook under this simulation are relatively small. 

In both simulations spending for the major health and retirement 
programs will increase as a share of GDP in coming decades, putting 
greater pressure on the rest of the federal budget. For the first few 
decades this spending is driven largely by the aging of the 
population. The oldest members of the baby-boom generation are already 
eligible for Social Security retirement benefits and for Medicare, 
and, as shown in figure 2, the number of baby boomers turning 65 is 
projected to grow in coming years from an average of about 7,600 per 
day in 2011 to more than 11,000 per day in 2029.As a result, the share 
of the population over the age of 65 is projected to increase from 
roughly 13 percent to over 19 percent during this time. 

Figure 2: Daily Average Number of People Turning 65 Each Year: 

[Refer to PDF for image: vertical bar graph] 

Daily Average Number of People Turning 65: 

[Refer to PDF for image: vertical bar graph] 

Fiscal year: 2000; 
Daily average number of people turning 65: 5,500. 

Fiscal year: 2001; 
Daily average number of people turning 65: 5,500. 

Fiscal year: 2003; 
Daily average number of people turning 65: 5,500. 

Fiscal year: 2003; 
Daily average number of people turning 65: 5,800. 

Fiscal year: 2004; 
Daily average number of people turning 65: 5,800. 

Fiscal year: 2005; 
Daily average number of people turning 65: 6,000. 

Fiscal year: 2006; 
Daily average number of people turning 65: 6,200. 

Fiscal year: 2007; 
Daily average number of people turning 65: 6,700. 

Fiscal year: 2008; 
Daily average number of people turning 65: 7,200. 

Fiscal year: 2009; 
Daily average number of people turning 65: 7,200. 

Fiscal year: 2010; 
Daily average number of people turning 65: 7,200. 

[Baby boomers turning 65] 

Fiscal year: 2011; 
Daily average number of people turning 65: 7,600. 

Fiscal year: 2012; 
Daily average number of people turning 65: 9,100. 

Fiscal year: 2013; 
Daily average number of people turning 65: 9,200. 

Fiscal year: 2014; 
Daily average number of people turning 65: 9,100. 

Fiscal year: 2015; 
Daily average number of people turning 65: 9,400. 

Fiscal year: 2016; 
Daily average number of people turning 65: 9,400. 

Fiscal year: 2017; 
Daily average number of people turning 65: 9,700. 

Fiscal year: 2018; 
Daily average number of people turning 65: 10,000. 

Fiscal year: 2019; 
Daily average number of people turning 65: 10,200. 

Fiscal year: 2020; 
Daily average number of people turning 65: 10,700. 

Fiscal year: 2021; 
Daily average number of people turning 65: 10,700. 

Fiscal year: 2022; 
Daily average number of people turning 65: 11,000. 

Fiscal year: 2023; 
Daily average number of people turning 65: 11,200. 

Fiscal year: 2024; 
Daily average number of people turning 65: 11,200. 

Fiscal year: 2025; 
Daily average number of people turning 65: 11,600. 

Fiscal year: 2026; 
Daily average number of people turning 65: 11,400. 

Fiscal year: 2027; 
Daily average number of people turning 65: 11,400. 

Fiscal year: 2028; 
Daily average number of people turning 65: 11,300. 

Fiscal year: 2029; 
Daily average number of people turning 65: 11,400. 

Source: GAO analysis of U.S. Census Bureau data. 

[End of figure] 

While the aging population is the largest contributor to health care 
spending growth in the next few decades, the longer-term outlook 
depends more heavily on assumptions about growth in the cost of caring 
for each beneficiary. One way of measuring growth in health spending 
per beneficiary is through the rate of excess cost growth, or the 
extent to which the annual growth rate of health care spending per 
capita exceeds the annual growth rate of potential GDP per capita 
adjusted to remove the effects of demographic characteristics such as 
aging. Excess cost growth leads to an ever-growing share of the 
nation's income being spent on health care, crowding out spending on 
all other goods and services. While excess cost growth has averaged 
around 2 percent over the last 35 years, going forward the Trustees 
and CBO both assume that excess cost growth will decrease over time 
because of the financial pressure health care spending is putting on 
the federal government, states, businesses, and households. How and 
when this transition takes place, however, is highly uncertain. 
Furthermore, while health care cost growth has slowed in recent years, 
it remains unclear to what degree this represents a temporary event 
related to the recent recession or a larger change to the U.S. health 
care system resulting from increased efficiency and coordination that 
may have a more lasting effect. 

Our simulations represent two potential paths for future health care 
cost growth. In the Baseline Extended simulation, the cost-containment 
mechanisms enacted in the Patient Protection and Affordable Care Act 
(PPACA) are assumed to be fully implemented and effective, slowing 
growth of health care spending over the long term. In this simulation 
excess cost growth averages 0.2 percent for Medicare over the long 
term, and spending on Medicare and Medicaid, the Children's Health 
Insurance Program (CHIP), and exchange subsidies grows from a little 
less than 5 percent of GDP in 2013 to 9 percent by 2050. However, the 
Trustees, CBO, and the CMS Actuary have questioned whether certain 
cost-containment mechanisms can be sustained over the long term. This 
is reflected in the Alternative simulation in which policies that 
would restrain spending growth are phased out over time. In this 
simulation excess cost growth averages 0.8 percent for Medicare over 
the long term, and spending on Medicare and Medicaid, CHIP, and 
exchange subsidies grows to over 10 percent of GDP by 2050. 

Sensitivity analysis shows that even assuming health care cost per 
capita does not grow faster than the economy after the first 10 years--
an outcome that has not been sustained for any extended length of time 
in the past several decades--debt held by the public rises steeply in 
the Alternative simulation in the next couple of decades.[Footnote 1] 
This demonstrates that significant policy changes beyond those 
designed to control per capita health care cost growth need to be 
taken in the next two decades to put federal debt on a more 
sustainable path. 

Figures 3 and 4 below show revenue and the composition of spending in 
the Baseline Extended and Alternative simulations moving forward. In 
the Baseline Extended simulation, not only is PPACA assumed to slow 
growth in health care spending, but over the long term discretionary 
spending is lower than at any point in the last 50 years and revenue 
is above the historical average. Even in this simulation, by 2030 
revenue covers little more than spending on Social Security, Medicare, 
Medicaid, CHIP, exchange subsidies, and net interest (see figure 
3).There is little room for "all other spending," which includes 
national defense, homeland security, and veteran's health care, as 
well as investment-oriented spending on highways and mass transit, 
education, and basic research that helps promote future economic 
growth. 

Figure 3: Potential Fiscal Outcomes: Revenues and Composition of 
Spending in the Baseline Extended Simulation: 

[Refer to PDF for image: stacked vertical bar and line graph] 

Percentage of GDP: 

Fiscal year: 2010; 
Net interest: 1.4%; 
Social Security: 4.9%; 
Medicare, Medicaid, CHIP, and exchange subsidies: 5.1%; 
All other spending: 12.8%; 
Revenue: 15.1%. 

Fiscal year: 2020; 
Net interest: 2.9%; 
Social Security: 5.2%; 
Medicare, Medicaid, CHIP, and exchange subsidies: 5.8%; 
All other spending: 8.3%; 
Revenue: 18.7%. 

Fiscal year: 2030; 
Net interest: 4.6%; 
Social Security: 6.2%; 
Medicare, Medicaid, CHIP, and exchange subsidies: 7.4%; 
All other spending: 7.9%; 
Revenue: 19.1%. 

Fiscal year: 2040; 
Net interest: 6.7%; 
Social Security: 6.3%; 
Medicare, Medicaid, CHIP, and exchange subsidies: 8.4%; 
All other spending: 7.9%; 
Revenue: 19.1%. 

Source: GAO. 

Notes: Data are from GAO's Spring 2013 simulations based on the 
Trustees' assumptions for Social Security and Medicare. 

[End of figure] 

As figure 4 shows, if the federal government follows historical trends 
and policy preferences, as assumed in the Alternative simulation, and 
borrows from the public to finance the growing imbalance between 
revenue and spending, by 2040 more than half of all federal revenue 
will go to net interest payments. Overall, our simulations illustrate 
the difficult trade-offs that policymakers will have to consider in 
order to put the federal government on a more sustainable path. 

Figure 4: Potential Fiscal Outcomes: Revenues and Composition of 
Spending in the Alternative Simulation: 

[Refer to PDF for image: stacked vertical bar and line graph] 

Percentage of GDP: 

Fiscal year: 2010; 
Net interest: 1.4%; 
Social Security: 4.9%; 
Medicare, Medicaid, CHIP, and exchange subsidies: 5.1%; 
All other spending: 12.8%; 
Revenue: 15.1%. 

Fiscal year: 2020; 
Net interest: 3.2%; 
Social Security: 5.2%; 
Medicare, Medicaid, CHIP, and exchange subsidies: 6.1%; 
All other spending: 8.7%; 
Revenue: 18.4%. 

Fiscal year: 2030; 
Net interest: 5.9%; 
Social Security: 6.2%; 
Medicare, Medicaid, CHIP, and exchange subsidies: 7.8%; 
All other spending: 9.5%; 
Revenue: 17.9%. 

Fiscal year: 2040; 
Net interest: 10.2%; 
Social Security: 6.3%; 
Medicare, Medicaid, CHIP, and exchange subsidies: 9.3%; 
All other spending: 10.0%; 
Revenue: 17.9%. 

Source: GAO. 

Notes: Data are from GAO's Spring 2013 simulations based on the 
Trustees' assumptions for Social Security and the CMS Actuary's 
assumptions for Medicare. 

[End of figure] 

Balancing Near-Term and Long-Term Considerations: 

One measure of the challenge over the long term is the "fiscal gap." 
The fiscal gap represents the difference, or gap, between revenue and 
noninterest spending over a certain period, such as 75 years, that 
would need to be closed in order to achieve a specified debt level at 
the end of the period. From the fiscal gap, one can calculate the size 
of action needed--in terms of tax increases, spending reductions, or, 
more likely, some combination of the two--to close the gap. 

For example, the fiscal gap in our Alternative simulation is 8 percent 
of GDP (see table 1). This means that revenue would have to increase 
by roughly 44 percent or noninterest spending would have to be reduced 
by about 32 percent (or some combination of the two) on average over 
the 75-year period to keep debt held by the public as a share of GDP 
in 2087 from exceeding its level at the beginning of 2013 (roughly 
72.5 percent of GDP). Even more significant changes would be needed to 
reduce debt to lower levels. 

Table 1: Federal Fiscal Gap under Our Simulations: 

Scenario: Baseline Extended; 
Fiscal gap 2013-2087 (percentage of GDP): 3.9%; 
Average percentage change required to close gap: 
If action is taken today, Solely through increases in revenue: 20.4%; 
If action is taken today, Solely through decreases in noninterest 
spending: 17.4%; 
If action is delayed until 2023, Solely through increases in revenue: 
24.3%; 
If action is delayed until 2023, Solely through decreases in 
noninterest spending: 20.4%. 

Scenario: Alternative; 
Fiscal gap 2013-2087 (percentage of GDP): 8.0%; 
Average percentage change required to close gap: 
If action is taken today, Solely through increases in revenue: 44.4%; 
If action is taken today, Solely through decreases in noninterest 
spending: 31.5%; 
If action is delayed until 2023, Solely through increases in revenue: 
53.2%; 
If action is delayed until 2023, Solely through decreases in 
noninterest spending: 36.3%. 

Source: GAO. 

Note: Data are from GAO's Spring 2013 simulations based on the 
Trustees' assumptions for Social Security and the Trustees' and CMS 
Actuary's assumptions for Medicare. 

[End of table] 

Given the current state of the economy, policy changes could be 
designed to phase in over time to avoid disrupting near-term economic 
growth and also to provide people with sufficient time to adjust. 
However, the longer action is delayed the greater the size of those 
actions will need to be and the risk that the eventual changes will be 
disruptive and destabilizing to the economy and individuals. Table 1 
illustrates how much greater fiscal policy changes would have to be if 
no actions were taken for the next decade. Under the Alternative 
simulation, waiting 10 years would increase the fiscal gap to nearly 
10 percent of GDP--meaning a revenue increase of about 53 percent or a 
noninterest spending cut of about 36 percent or some combination of 
the two would be required to bring debt held by the public back to its 
level in 2013 by 2087. 

Concluding Observations: 

Addressing the long-term fiscal challenge will not be easy and will 
likely require difficult choices affecting both revenue and spending. 
Many of the long-term drivers of the federal government's fiscal 
imbalance, such as the aging of the population, are beginning to 
affect the federal budget at a time when federal debt held by the 
public is already at historically high levels. Therefore, policy 
options may already be more constrained. If changes are to be phased 
in over time to allow the people sufficient time to adjust, action 
must be taken now. The window of opportunity for putting federal 
health and retirement programs on a sound footing without disruptive 
effects on the large population of near retirees is closing. The 
recent slowdown in the growth of federal health care spending is 
encouraging and, if sustained, could have a meaningful effect on the 
long-term outlook. However, given the aging of the population and the 
growth of enrollment in federal health care programs projected in the 
next two decades, slowing the growth in spending per beneficiary alone 
will not be enough to address the federal government's fiscal 
imbalance. 

Key Changes since the Last Update: 

This update incorporates CBO's February 2013 baseline projections that 
follow current law at the time.[Footnote 2] As previously discussed, 
this includes the effects of ATRA, which, among other changes, 
permanently extended many of the tax provisions that were previously 
set to expire and modified tax rates for higher-income taxpayers. 
Overall, the changes reduced the long-term revenue assumption used in 
the Baseline Extended simulation relative to our prior update, though 
revenue in the Baseline Extended simulation remains above historical 
averages after 2013. Conversely, the changes increased revenue in the 
first 10 years of the Alternative simulation after which time revenue 
returns to the historical average. 

CBO's February 2013 baseline projections also include a reduction in 
its 10-year projections for Medicaid spending, which CBO attributes in 
part to more people receiving employer-based health care coverage than 
previously estimated. As a result, spending on Medicaid, CHIP, and 
exchange subsidies in our simulations, which is extrapolated from the 
CBO baseline, is lower than it was in the Fall 2012 Update. 

Key Assumptions in Our Federal Simulations: 

Table 2 lists the key assumptions incorporated in the Baseline 
Extended and Alternative simulations based on the Trustees' 
assumptions for Social Security and the Trustees' and CMS Actuary's 
assumptions for Medicare. 

Table 2: Key Budget Assumptions for Baseline Extended and Alternative 
Simulations Based on the Social Security and Medicare Trustees' 
Projections: 

Model inputs: Revenue; 
Baseline Extended simulation: CBO's February 2013 baseline that 
assumes tax provisions expire as scheduled under current law and 
growth of real income causes a greater proportion of taxpayers' income 
to be taxed in higher brackets through 2023; thereafter remains 
constant at 19.1 percent of GDP (CBO's projection in 2023); 
Alternative simulation: CBO's estimates that assume expiring tax 
provisions are extended through 2023, thereafter phases into the 40-
year historical average of 17.9 percent of GDP. 

Model inputs: Social Security spending; 
CBO's February 2013 baseline through 2023; 
thereafter phases into the 2012 Social Security Trustees' intermediate 
projections; 
Alternative simulation: Same as Baseline Extended. 

Model inputs: Medicare spending; 
Baseline Extended simulation: CBO's February 2013 baseline through 
2023 that assumes cuts in physician payment rates will occur as 
scheduled under current law at the time[A] and the Budget Control 
Act's automatic enforcement procedures reduce spending;b thereafter 
phases into the 2012 Medicare Trustees' intermediate projections in 
which cost containment mechanisms, including those enacted in the 
Patient Protection and Affordable Care Act, reduce excess cost growth 
to 0.2 percentage points on average over the long term[D]; 
Alternative simulation: Based on CMS Actuary's alternative scenario 
that assumes physician payment rates grow by 1 percent annually 
through 2021[A] and then gradually transition to a long-term growth 
rate equal to the per capita increase in overall health spending; 
spending reductions scheduled under the Budget Control Act do not 
occur,c and policies that would restrain spending growth are applied 
fully through 2019 but begin to phase out thereafter; 
excess cost growth averages 0.8 percentage point over the long term[D]. 

Model inputs: Medicaid, the Children's Health Insurance Program, and 
exchange subsidies spending; 
Baseline Extended simulation: CBO's February 2013 baseline through 
2023; thereafter growth in spending for these programs is consistent 
with CBO's June 2012 long-term assumptions for the number and age 
composition of enrollees and the 2012 Medicare Trustees' intermediate 
assumptions for excess cost growth; excess cost growth averages 0.8 
percentage points over the long term[D]; 
Alternative simulation: CBO's February 2013 baseline through 2023; 
thereafter growth in spending for these programs is consistent with 
CBO's June 2012 long-term assumptions for the number and age 
composition of enrollees under CBO's alternative assumption that a 
policy that would slow the growth of per-participant subsidies for 
health insurance coverage is not in effect and eligibility thresholds 
are modified to maintain the share of the population eligible for 
subsidies; as in Baseline Extended, excess cost growth averages 0.8 
percentage points over the long term[D]. 

Model inputs: Other mandatory spending; 
Baseline Extended simulation: CBO's February 2013 baseline through 
2023, which incorporates the reductions in spending scheduled to occur 
under the Budget Control Act's automatic enforcement procedures;[B] 
thereafter remains constant as a share of GDP at 2.4 percent of GDP 
(implied by CBO's projection in 2023); 
Alternative simulation: CBO's February 2013 baseline adjusted for 
extension of certain tax credits and to exclude the effects of the 
Budget Control Act's automatic enforcement procedures through 
2023;[B,C] thereafter remains constant as a share of GDP at 2.5 
percent (the level reached in 2023). 

Model inputs: Discretionary spending; 
Baseline Extended simulation: CBO's February 2013 baseline through 
2023, which reflects the original caps set by the Budget Control Act, 
as well as the lower caps triggered by the automatic enforcement 
procedures;[B] thereafter remains constant at 5.5 percent of GDP 
(CBO's projection in 2023); 
Alternative simulation: Follows the original caps set by the Budget 
Control Act but not the lower caps triggered by the automatic 
enforcement procedures;[B,C] after 2023 gradually phases up to 7.5 
percent of GDP (the 20-year historical average). 

Source: GAO. 

Notes: CBO's projections are from The Budget and Economic Outlook: 
Fiscal Years 2013 to 2023 (February 2013) and CBO's The 2012 Long-Term 
Budget Outlook (June 2012). Trustees projections are from The 2012 
Annual Report of the Board of Trustees of the Federal Old-Age and 
Survivors Insurance and Federal Disability Insurance Trust Funds and 
The 2012 Annual Report of the Boards of Trustees of the Federal 
Hospital Insurance and Federal Supplementary Medical Insurance Trust 
Funds, which were both issued on April 23, 2012. Projections from the 
CMS Actuary are based on "Projected Medicare Expenditures under 
Illustrative Scenarios with Alternative Payment Updates to Medicare 
Providers" (May 18, 2012). We assume that Social Security and Medicare 
benefits are paid in full regardless of the amounts available in the 
trust funds. 

[A] Physician payment rates are scheduled to be reduced by roughly 25 
percent at the start of 2014 and smaller amounts in subsequent years 
under the sustainable growth rate (SGR) system. Since 2003, Congress 
has taken a series of legislative actions to override scheduled 
reductions in physician payment rates that would otherwise occur under 
current law at the time. Physician fee updates set by Congress have 
averaged 0.8 percent per year over this period. 

[B] The Budget Control Act established limits on discretionary budget 
authority for 2012 through 2021.It also included automatic enforcement 
procedures that will reduce both discretionary and mandatory spending 
because lawmakers did not enact legislation originating from the Joint 
Select Committee on Deficit Reduction that would lower projected 
budget deficits by $1.2 trillion. ATRA reduced the size of these 
automatic spending reductions scheduled for 2013 to roughly $85 
billion and delayed their effects until March 2013. In 2013, these 
reductions will be accomplished through across-the-board spending 
reductions known as sequestration. After 2013, spending reductions are 
achieved through lower limits on discretionary spending and automatic 
reductions in mandatory spending, including Medicare. 

[C] The Alternative simulation, which was prepared prior to the 
enactment of full-year appropriations for fiscal year 2013, assumes 
that sequestration does not occur as scheduled in 2013. While 
sequestration has begun to take effect, the difference in spending 
from this assumption has only a small impact on federal debt in the 
Alternative simulation in the near-term and a negligible effect over 
the long term. 

[D] Excess cost growth refers to the annual growth rate of health care 
spending per enrollee in excess of the annual growth rate of potential 
GDP, adjusted for demographic characteristics. 

[End of table] 

Table 3 shows the key economic assumptions that underlie all of our 
simulations. GDP is held constant across simulations and does not 
respond to changes in fiscal policy. Also, the implied interest rate 
on federal debt held by the public in our simulations is held constant 
over the long term even when deficits climb. With large budget 
deficits, there could be a rise in the rate of interest and a more 
rapid increase in federal interest payments than our simulations 
display. 

Table 3: Key Economic Assumptions Underlying All of Our Long-Term 
Federal Simulations: 

Model inputs: Real GDP growth; 
All simulations: CBO's February 2013 baseline through 2023; thereafter 
averages 2.1 percent based on the intermediate assumptions of the 2012 
Social Security and Medicare Trustees Reports. 

Model inputs: Inflation (percentage change in GDP price index); 
All simulations: CBO's February 2013 baseline through 2023; 2 percent 
thereafter (CBO's projection in 2023). 

Model inputs: Interest rate (on debt held by the public); 
All simulations: Rate implied by CBO's February 2013 baseline net 
interest payment projections through 2023; phasing to 5.2 percent by 
2028 and then constant thereafter (based on CBO's June 2012 long-term 
projection). 

Source: GAO. 

[End of table] 

The simulation results depend largely on what is assumed about growth 
in spending for large entitlement programs. As in previous updates, we 
also show the Baseline Extended simulation using both Trustees and CBO 
estimates for long-term spending on Social Security and major health 
entitlement programs (Medicare, Medicaid, and others). In addition, we 
show the Alternative simulation using different assumptions about 
certain health care cost-containment provisions based on CBO and CMS 
Actuary alternative projections. As figure 5 shows, the results are 
largely the same. The outlook under either set of assumptions is 
unsustainable. 

Figure 5: Debt Held by the Public under Fiscal Policy Simulations with 
Different Assumptions for Major Entitlement Programs: 

[Refer to PDF for image: multiple line graph] 

Fiscal year: 2000; 
Baseline Extended, CBO Social Security and baseline health: 34.7%; 
Alternative, CBO Social Security and baseline health: 34.7%; 
Baseline Extended, Trustees Intermediate Social Security and Medicare: 
34.7%; 
Alternative, Trustees Intermediate Social Security and CMS Actuary 
alternative Medicare: 34.7%. 

Fiscal year: 2001; 
Baseline Extended, CBO Social Security and baseline health: 32.5%; 
Alternative, CBO Social Security and baseline health: 32.5%; 
Baseline Extended, Trustees Intermediate Social Security and Medicare: 
32.5%; 
Alternative, Trustees Intermediate Social Security and CMS Actuary 
alternative Medicare: 32.5%. 

Fiscal year: 2002; 
Baseline Extended, CBO Social Security and baseline health: 33.6%; 
Alternative, CBO Social Security and baseline health: 33.6%; 
Baseline Extended, Trustees Intermediate Social Security and Medicare: 
33.6%; 
Alternative, Trustees Intermediate Social Security and CMS Actuary 
alternative Medicare: 33.6%. 

Fiscal year: 2003; 
Baseline Extended, CBO Social Security and baseline health: 35.6%; 
Alternative, CBO Social Security and baseline health: 35.6%; 
Baseline Extended, Trustees Intermediate Social Security and Medicare: 
35.6%; 
Alternative, Trustees Intermediate Social Security and CMS Actuary 
alternative Medicare: 35.6%. 

Fiscal year: 2004; 
Baseline Extended, CBO Social Security and baseline health: 36.8%; 
Alternative, CBO Social Security and baseline health: 36.8%; 
Baseline Extended, Trustees Intermediate Social Security and Medicare: 
36.8%; 
Alternative, Trustees Intermediate Social Security and CMS Actuary 
alternative Medicare: 36.8%. 

Fiscal year: 2005; 
Baseline Extended, CBO Social Security and baseline health: 36.9; 
Alternative, CBO Social Security and baseline health: 36.9; 
Baseline Extended, Trustees Intermediate Social Security and Medicare: 
36.9%; 
Alternative, Trustees Intermediate Social Security and CMS Actuary 
alternative Medicare: 36.9%. 

Fiscal year: 2006; 
Baseline Extended, CBO Social Security and baseline health: 36.6%; 
Alternative, CBO Social Security and baseline health: 36.6%; 
Baseline Extended, Trustees Intermediate Social Security and Medicare: 
36.6%; 
Alternative, Trustees Intermediate Social Security and CMS Actuary 
alternative Medicare: 36.6%. 

Fiscal year: 2007; 
Baseline Extended, CBO Social Security and baseline health: 36.3%; 
Alternative, CBO Social Security and baseline health: 36.3%; 
Baseline Extended, Trustees Intermediate Social Security and Medicare: 
36.3%; 
Alternative, Trustees Intermediate Social Security and CMS Actuary 
alternative Medicare: 36.3%. 

Fiscal year: 2008; 
Baseline Extended, CBO Social Security and baseline health: 40.5%; 
Alternative, CBO Social Security and baseline health: 40.5%; 
Baseline Extended, Trustees Intermediate Social Security and Medicare: 
40.5%; 
Alternative, Trustees Intermediate Social Security and CMS Actuary 
alternative Medicare: 40.5%. 

Fiscal year: 2009; 
Baseline Extended, CBO Social Security and baseline health: 54.1%; 
Alternative, CBO Social Security and baseline health: 54.1%; 
Baseline Extended, Trustees Intermediate Social Security and Medicare: 
54.1%; 
Alternative, Trustees Intermediate Social Security and CMS Actuary 
alternative Medicare: 54.1%. 

Fiscal year: 2010; 
Baseline Extended, CBO Social Security and baseline health: 62.9%; 
Alternative, CBO Social Security and baseline health: 62.9%; 
Baseline Extended, Trustees Intermediate Social Security and Medicare: 
62.9%; 
Alternative, Trustees Intermediate Social Security and CMS Actuary 
alternative Medicare: 62.9%. 

Fiscal year: 2011; 
Baseline Extended, CBO Social Security and baseline health: 67.8%; 
Alternative, CBO Social Security and baseline health: 67.8%; 
Baseline Extended, Trustees Intermediate Social Security and Medicare: 
67.8%; 
Alternative, Trustees Intermediate Social Security and CMS Actuary 
alternative Medicare: 67.8%. 

Fiscal year: 2012; 
Baseline Extended, CBO Social Security and baseline health: 72.5%; 
Alternative, CBO Social Security and baseline health: 72.5%; 
Baseline Extended, Trustees Intermediate Social Security and Medicare: 
72.5%; 
Alternative, Trustees Intermediate Social Security and CMS Actuary 
alternative Medicare: 72.5%. 

Fiscal year: 2013; 
Baseline Extended, CBO Social Security and baseline health: 76.3%; 
Alternative, CBO Social Security and baseline health: 76.5%; 
Baseline Extended, Trustees Intermediate Social Security and Medicare: 
76.3%; 
Alternative, Trustees Intermediate Social Security and CMS Actuary 
alternative Medicare: 76.6%. 

Fiscal year: 2014; 
Baseline Extended, CBO Social Security and baseline health: 77.7%; 
Alternative, CBO Social Security and baseline health: 79%; 
Baseline Extended, Trustees Intermediate Social Security and Medicare: 
77.7%; 
Alternative, Trustees Intermediate Social Security and CMS Actuary 
alternative Medicare: 79.1%. 

Fiscal year: 2015; 
Baseline Extended, CBO Social Security and baseline health: 76.3%; 
Alternative, CBO Social Security and baseline health: 78.9%; 
Baseline Extended, Trustees Intermediate Social Security and Medicare: 
76.3%; 
Alternative, Trustees Intermediate Social Security and CMS Actuary 
alternative Medicare: 79%. 

Fiscal year: 2016; 
Baseline Extended, CBO Social Security and baseline health: 74.6%; 
Alternative, CBO Social Security and baseline health: 78.2%; 
Baseline Extended, Trustees Intermediate Social Security and Medicare: 
74.6%; 
Alternative, Trustees Intermediate Social Security and CMS Actuary 
alternative Medicare: 78.5%. 

Fiscal year: 2017; 
Baseline Extended, CBO Social Security and baseline health: 73.4%; 
Alternative, CBO Social Security and baseline health: 78%; 
Baseline Extended, Trustees Intermediate Social Security and Medicare: 
73.4%; 
Alternative, Trustees Intermediate Social Security and CMS Actuary 
alternative Medicare: 78.3%. 

Fiscal year: 2018; 
Baseline Extended, CBO Social Security and baseline health: 73.1%; 
Alternative, CBO Social Security and baseline health: 78.9%; 
Baseline Extended, Trustees Intermediate Social Security and Medicare: 
73.1%; 
Alternative, Trustees Intermediate Social Security and CMS Actuary 
alternative Medicare: 79.1%. 

Fiscal year: 2019; 
Baseline Extended, CBO Social Security and baseline health: 73.5%; 
Alternative, CBO Social Security and baseline health: 80.5%; 
Baseline Extended, Trustees Intermediate Social Security and Medicare: 
73.5%; 
Alternative, Trustees Intermediate Social Security and CMS Actuary 
alternative Medicare: 80.6%. 

Fiscal year: 2020; 
Baseline Extended, CBO Social Security and baseline health: 74.2%; 
Alternative, CBO Social Security and baseline health: 82.3%; 
Baseline Extended, Trustees Intermediate Social Security and Medicare: 
74.2%; 
Alternative, Trustees Intermediate Social Security and CMS Actuary 
alternative Medicare: 82.4%. 

Fiscal year: 2021; 
Baseline Extended, CBO Social Security and baseline health: 75%; 
Alternative, CBO Social Security and baseline health: 84.3%; 
Baseline Extended, Trustees Intermediate Social Security and Medicare: 
75%; 
Alternative, Trustees Intermediate Social Security and CMS Actuary 
alternative Medicare: 84.4%. 

Fiscal year: 2022; 
Baseline Extended, CBO Social Security and baseline health: 76%; 
Alternative, CBO Social Security and baseline health: 86.5%; 
Baseline Extended, Trustees Intermediate Social Security and Medicare: 
76%; 
Alternative, Trustees Intermediate Social Security and CMS Actuary 
alternative Medicare: 86.6%. 

Fiscal year: 2023; 
Baseline Extended, CBO Social Security and baseline health: 77%; 
Alternative, CBO Social Security and baseline health: 88.7%; 
Baseline Extended, Trustees Intermediate Social Security and Medicare: 
77%; 
Alternative, Trustees Intermediate Social Security and CMS Actuary 
alternative Medicare: 88.7%. 

Fiscal year: 2024; 
Baseline Extended, CBO Social Security and baseline health: 78.2%; 
Alternative, CBO Social Security and baseline health: 91.7%; 
Baseline Extended, Trustees Intermediate Social Security and Medicare: 
78.5%; 
Alternative, Trustees Intermediate Social Security and CMS Actuary 
alternative Medicare: 91.6%. 

Fiscal year: 2025; 
Baseline Extended, CBO Social Security and baseline health: 80%; 
Alternative, CBO Social Security and baseline health: 95.5%; 
Baseline Extended, Trustees Intermediate Social Security and Medicare: 
80.3%; 
Alternative, Trustees Intermediate Social Security and CMS Actuary 
alternative Medicare: 95.2%. 

Fiscal year: 2026; 
Baseline Extended, CBO Social Security and baseline health: 82.1%; 
Alternative, CBO Social Security and baseline health: 100%; 
Baseline Extended, Trustees Intermediate Social Security and Medicare: 
82.6%; 
Alternative, Trustees Intermediate Social Security and CMS Actuary 
alternative Medicare: 99.7%. 

Fiscal year: 2027; 
Baseline Extended, CBO Social Security and baseline health: 84.7%; 
Alternative, CBO Social Security and baseline health: 105.3%; 
Baseline Extended, Trustees Intermediate Social Security and Medicare: 
85.1%; 
Alternative, Trustees Intermediate Social Security and CMS Actuary 
alternative Medicare: 105.1%. 

Fiscal year: 2028; 
Baseline Extended, CBO Social Security and baseline health: 87.8%; 
Alternative, CBO Social Security and baseline health: 111.4%; 
Baseline Extended, Trustees Intermediate Social Security and Medicare: 
88.1%; 
Alternative, Trustees Intermediate Social Security and CMS Actuary 
alternative Medicare: 111.1%. 

Fiscal year: 2029; 
Baseline Extended, CBO Social Security and baseline health: 91.1%; 
Alternative, CBO Social Security and baseline health: 118.1%; 
Baseline Extended, Trustees Intermediate Social Security and Medicare: 
91.2%; 
Alternative, Trustees Intermediate Social Security and CMS Actuary 
alternative Medicare: 117.7%. 

Fiscal year: 2030; 
Baseline Extended, CBO Social Security and baseline health: 94.7%; 
Alternative, CBO Social Security and baseline health: 125.3%; 
Baseline Extended, Trustees Intermediate Social Security and Medicare: 
94.7%; 
Alternative, Trustees Intermediate Social Security and CMS Actuary 
alternative Medicare: 125.1%. 

Fiscal year: 2031; 
Baseline Extended, CBO Social Security and baseline health: 98.4%; 
Alternative, CBO Social Security and baseline health: 132.9%; 
Baseline Extended, Trustees Intermediate Social Security and Medicare: 
98.5%; 
Alternative, Trustees Intermediate Social Security and CMS Actuary 
alternative Medicare: 132.7%. 

Fiscal year: 2032; 
Baseline Extended, CBO Social Security and baseline health: 102.3%; 
Alternative, CBO Social Security and baseline health: 140.9%; 
Baseline Extended, Trustees Intermediate Social Security and Medicare: 
102.4%; 
Alternative, Trustees Intermediate Social Security and CMS Actuary 
alternative Medicare: 140.7%. 

Fiscal year: 2033; 
Baseline Extended, CBO Social Security and baseline health: 106.3%; 
Alternative, CBO Social Security and baseline health: 149.2%; 
Baseline Extended, Trustees Intermediate Social Security and Medicare: 
106.5%; 
Alternative, Trustees Intermediate Social Security and CMS Actuary 
alternative Medicare: 149.2%. 

Fiscal year: 2034; 
Baseline Extended, CBO Social Security and baseline health: 110.4%; 
Alternative, CBO Social Security and baseline health: 157.7%; 
Baseline Extended, Trustees Intermediate Social Security and Medicare: 
110.7%; 
Alternative, Trustees Intermediate Social Security and CMS Actuary 
alternative Medicare: 157.7%. 

Fiscal year: 2035; 
Baseline Extended, CBO Social Security and baseline health: 114.7%; 
Alternative, CBO Social Security and baseline health: 166.4%; 
Baseline Extended, Trustees Intermediate Social Security and Medicare: 
115%; 
Alternative, Trustees Intermediate Social Security and CMS Actuary 
alternative Medicare: 166.4%. 

Fiscal year: 2036; 
Baseline Extended, CBO Social Security and baseline health: 119.2%; 
Alternative, CBO Social Security and baseline health: 175.5%; 
Baseline Extended, Trustees Intermediate Social Security and Medicare: 
119.6%; 
Alternative, Trustees Intermediate Social Security and CMS Actuary 
alternative Medicare: 175.6%. 

Fiscal year: 2037; 
Baseline Extended, CBO Social Security and baseline health: 123.9%; 
Alternative, CBO Social Security and baseline health: 184.8%; 
Baseline Extended, Trustees Intermediate Social Security and Medicare: 
124.5%; 
Alternative, Trustees Intermediate Social Security and CMS Actuary 
alternative Medicare: 185.1%. 

Fiscal year: 2038; 
Baseline Extended, CBO Social Security and baseline health: 128.6%; 
Alternative, CBO Social Security and baseline health: 194.3%; 
Baseline Extended, Trustees Intermediate Social Security and Medicare: 
129.4%; 
Alternative, Trustees Intermediate Social Security and CMS Actuary 
alternative Medicare: 194.5%. 

Fiscal year: 2039; 
Baseline Extended, CBO Social Security and baseline health: 133.4%; 
Baseline Extended, Trustees Intermediate Social Security and Medicare: 
134.5%. 

Fiscal year: 2040; 
Baseline Extended, CBO Social Security and baseline health: 138.4%;
Baseline Extended, Trustees Intermediate Social Security and Medicare: 
139.7%. 

Fiscal year: 2041; 
Baseline Extended, CBO Social Security and baseline health: 143.3%; 
Baseline Extended, Trustees Intermediate Social Security and Medicare: 
145.1%. 

Fiscal year: 2042; 
Baseline Extended, CBO Social Security and baseline health: 148.4; 
Baseline Extended, Trustees Intermediate Social Security and Medicare: 
150.7%. 

Fiscal year: 2043; 
Baseline Extended, CBO Social Security and baseline health: 153.5%; 
Baseline Extended, Trustees Intermediate Social Security and Medicare: 
156.5%. 

Fiscal year: 2044; 
Baseline Extended, CBO Social Security and baseline health: 158.9%; 
Baseline Extended, Trustees Intermediate Social Security and Medicare: 
162.3%. 

Fiscal year: 2045; 
Baseline Extended, CBO Social Security and baseline health: 164.3%; 
Baseline Extended, Trustees Intermediate Social Security and Medicare: 
168.3%. 

Fiscal year: 2046; 
Baseline Extended, CBO Social Security and baseline health: 169.9%; 
Baseline Extended, Trustees Intermediate Social Security and Medicare: 
174.5%. 

Fiscal year: 2047; 
Baseline Extended, CBO Social Security and baseline health: 175.7%; 
Baseline Extended, Trustees Intermediate Social Security and Medicare: 
181.1%. 

Fiscal year: 2048; 
Baseline Extended, CBO Social Security and baseline health: 181.5%; 
Baseline Extended, Trustees Intermediate Social Security and Medicare: 
187.9%. 

Fiscal year: 2049; 
Baseline Extended, CBO Social Security and baseline health: 187.5%; 
Baseline Extended, Trustees Intermediate Social Security and Medicare: 
194.9%. 

Fiscal year: 2050; 
Baseline Extended, Trustees Intermediate Social Security and Medicare: 
193.5%. 

Fiscal year: 2051; 
Baseline Extended, Trustees Intermediate Social Security and Medicare: 
199.6%. 

Source: GAO. 

Note: Data are from GAO's Spring 2013 simulations based on the 
Trustees' and CBO's assumptions for Social Security and the Trustees', 
CMS Actuary's, and CBO's assumptions for Medicare. 

[End of figure] 

Table 4 shows the assumptions incorporated into the simulations based 
on CBO's projections for major entitlement programs used in the 
comparison shown in figure 5. 

Table 4: Key Budget Assumptions Underlying Our Simulations Using CBO's 
Spending Projections for Major Entitlement Programs: 

Model inputs: Social Security spending; 
Baseline Extended simulation: CBO's February 2013 baseline through 
2023; thereafter based on CBO's June 2012 long-term projections for 
Social Security; 
Alternative simulation: Same as Baseline Extended. 

Model inputs: Medicare spending; 
Baseline Extended simulation: CBO's February 2013 baseline through 
2023; thereafter based on CBO's June 2012 long-term projections under 
its extended-baseline scenario that assumes policies that would 
restrain; spending growth are not in effect after 2029 and excess cost 
growth averages 1.2 percentage points per year over the long term[A]; 
Alternative simulation: Based on CBO's projections under its 
alternative fiscal scenario that assumes physician payment rates are 
maintained at 2012 levels through 2022; spending reductions under the 
BCA do not occur; policies to restrain growth are not in effect after 
2022; and excess cost growth averages 1.3 percentage points per year 
over the long term[A]. 

Model inputs: Medicaid, the Children's Health Insurance Program, and 
exchange subsidies spending; 
Baseline Extended simulation: CBO's February 2013 baseline through 
2023; thereafter based on CBO's June 2012 long-term projections under 
its extended-baseline scenario which follows current law and assumes 
that excess cost growth averages 0.7 percentage points per year over 
the long term for Medicaid and CHIP and transitions to the underlying 
rate for private insurance premiums after 2029 for exchange 
subsidies[A]; 
Alternative simulation: CBO's February 2013 baseline through 2023; 
thereafter CBO's June 2012 projections under its alternative fiscal 
scenario in which a policy that would slow the growth of per-
participant subsidies for health insurance coverage is assumed to not 
be in effect; eligibility thresholds are assumed to be modified to 
maintain the share of the population eligible for subsidies; 
excess cost growth for exchange subsidies is consistent with the 
Baseline Extended; and excess cost for Medicaid and CHIP growth 
averages 0.7 percentage points per year over the long term[A]. 

Source: GAO. 

Notes: CBO's projections are from The Budget and Economic Outlook: 
Fiscal Years 2013 to 2023 (February 2013) and CBO's The 2012 Long-Term 
Budget Outlook (June 2012). CBO assumes that full benefits are paid 
regardless of the amounts available in the trust funds. 

[A] Excess cost growth refers to the annual growth rate of health care 
spending per enrollee in excess of the annual growth rate of potential 
GDP, adjusted for demographic characteristics. 

[End of table] 

This product is part of a body of work on federal debt and the long-
term fiscal challenge. Related products can be found at [hyperlink, 
http://www.gao.gov/special.pubs/longterm/index.html]. 

Our simulations provide illustrations--not precise forecasts--of the 
relative outcomes associated with different fiscal policy assumptions. 
These simulations are not predictions of what will happen in the 
future, as policymakers would likely take action to prevent damaging 
out-year fiscal consequences. While recognizing the uncertainty 
inherent in long-term projections, we determined that the data used 
were sufficiently reliable for our purposes of illustrating the 
potential fiscal outcomes under different sets of broad policy 
decisions. To assess the reliability of the data used in our 
simulations, we reviewed the data to ensure it was presented 
consistently across documents and that the methodology used to create 
the projections was clear and reasonable. Where possible, we also 
assessed whether the data were reasonable by comparing to other's 
reporting of similar data. 

We conducted our work from February 2013 to April 2013 in accordance 
with all sections of GAO's Quality Assurance Framework that are 
relevant to our objectives. The framework requires that we plan and 
perform the engagement to obtain sufficient and appropriate evidence 
to meet our stated objectives and to discuss any limitations in our 
work. We believe that the information and data obtained, and the 
analysis conducted, provide a reasonable basis for any findings and 
conclusions in this product. 

[End of section] 

Footnotes: 

[1] For sensitivity analysis of the effects of different assumptions 
about excess cost growth on our long-term simulations, see GAO, 
Patient Protection and Affordable Care Act: Effect on Long-Term 
Federal Budget Outlook Largely Depends on Whether Cost Containment 
Sustained, [hyperlink, http://www.gao.gov/products/GAO-13-281] 
(Washington, D.C.: Jan. 31, 2013). 

[2] The CBO report is available at [hyperlink, http://www.cbo.gov]. 

[End of section] 

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