Partnerships and S Corporations:

IRS Needs to Improve Information to Address Tax Noncompliance

GAO-14-453: Published: May 14, 2014. Publicly Released: Jun 13, 2014.

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What GAO Found

The full extent of partnership and S corporation income misreporting is unknown. The Internal Revenue Service's (IRS) last study of S corporations, using 2003-2004 data, estimated that these entities annually misreported about 15 percent (an average of $55 billion for 2003 and 2004) of their income. IRS does not have a similar study for partnerships. Using IRS data and the study results, GAO derived a rough-order-of-magnitude estimate of $91 billion per year of partnership and S corporation income being misreported by individuals for 2006 through 2009.

IRS examinations and automated document matching have not been effective at finding most of the estimated misreported income. For example, IRS reported that examinations identified about $16 billion per year of misreporting in 2011 and 2012, the bulk of which related to partnerships. However, such information about compliance results is not reliable. IRS estimated that 3 to 22 percent of the misreporting by partnerships was double counted due to some partnership income being allocated to other partnerships or related parties. Further, IRS does not know how income misreporting by partnerships affects taxes paid by partners. IRS does not have a strategy to improve the information. As a result, IRS does not have reliable information about its compliance results to fully inform decisions about allocating examination resources across different types of businesses.

IRS's processes for selecting returns to examine could be improved. Not all partnership and S corporation line items from paper returns are digitized, and IRS officials said that having more return information available electronically might improve examination selection. In 2011, about 65 percent of partnerships and S corporations electronically filed (e-filed). Certain large partnerships and S corporations are required by statute to e-file. Expanding the mandate would increase digitized data available for examination selection. Further, in 1995 GAO found that IRS's computer scoring system for selecting partnership returns to examine used outdated information. IRS does not have a strategy to update and use this information to select partnerships for examination. Relatively few partnerships are examined compared to other business entities, and many examinations result in no change in taxes owed. Improved examination selection based on more current information could generate more revenue and reduce IRS examinations of compliant taxpayers.

Fiscal Year 2012 Examination and Adjustment Rates for Different Types of Tax Returns

Fiscal Year 2012 Examination and Adjustment Rates for Different Types of Tax Returns

Why GAO Did This Study

Since 1980, partnerships' and S corporations' share of business receipts increased greatly. These entities generally do not pay income taxes. Instead, income or losses (hundreds of billions of dollars annually) flow through to partners and shareholders to include on their income tax returns. GAO has previously reported that the misreporting of income by partners and shareholders poses a tax compliance risk.

GAO was asked to assess IRS's efforts to ensure compliance by partnerships and S corporations. This report (1) describes what is known about misreporting of flow-through income, (2) assesses how much misreporting IRS identifies, and (3) analyzes possible improvements in IRS's use of data to better identify partnerships and S corporations to consider examining. Comparing partnership, S corporation, and other entities' examination results, GAO analyzed 2003-2012 IRS data and evaluated possible improvement ideas stemming, in part, from prior GAO work, for how IRS identifies examination workload.

What GAO Recommends

GAO suggests that Congress consider requiring more partnerships and corporations to e-file their tax returns. GAO recommends, among other things, that IRS (1) develop a strategy to improve its information on the extent and nature of partnership misreporting, and (2) use the information to potentially improve how it selects partnership returns to examine. IRS stated it would consider all the recommendations and identify appropriate actions.

For more information, contact James R. White at (202) 512-9110 or

Matter for Congressional Consideration

  1. Status: Open

    Comments: No legislative action identified.

    Matter: Congress should consider expanding the mandate for partnerships and corporations to electronically file their tax returns to cover a greater share of filed returns.

Recommendations for Executive Action

  1. Status: Open

    Comments: IRS has developed a strategy to better estimate the extent and nature of partnership misreporting, and the effectiveness of partnership examinations in detecting this misreporting as GAO recommended in May 2014. Specifically, IRS established a working team that included membership from the Office of Research, Analysis and Statistics, Small Business/Self Employed, and Large Business and International operating divisions. The team met regularly to discuss and evaluate alternative approaches. It has recommended a multi-year examination effort to collect audit data from a representative, statistical sample of the partnership population, which would consist of two phases, a pilot and a full study. However, IRS still needs to take the next step and implement the working team's recommendation. IRS officials stated that the pilot study will be started in fiscal year 2016, and the full study would begin when there was consensus that the pilot effort produced a reasonably efficient sample design.

    Recommendation: The Commissioner of Internal Revenue should develop and implement a strategy to better estimate (1) the extent and nature of partnership misreporting, and (2) the effectiveness of partnership examinations in detecting this misreporting.

    Agency Affected: Department of the Treasury: Internal Revenue Service

  2. Status: Open

    Comments: After IRS develops a strategy for gaining a better understanding of the extent and nature of partnership misreporting and the effectiveness of examinations in detecting the misreporting, it plans to evaluate differences in examination rates among types of business entities and consider alternative approaches to workload selection for partnership returns. It proposes to complete this action by September 2017.

    Recommendation: The Commissioner of Internal Revenue should use the better information on noncompliance and program effectiveness to determine (1) whether the differences in examination rates across different types of business entities are justified, and (2) whether an improved tool for selecting partnerships for examination, such as an updated partnership discriminant function, should be developed.

    Agency Affected: Department of the Treasury: Internal Revenue Service

  3. Status: Open

    Comments: IRS stated it understands the objective of this recommendation and, at such time that resources are available to enhance capabilities, it would consider the proposed methodology of advanced testing. However, IRS currently will not pursue the recommendation actions and based on current budget predictions, it does not expect this to change in the near future.

    Recommendation: While IRS works to improve the quality of its Schedule K-1 data, the Commissioner of Internal Revenue should develop a plan for conducting testing or other analysis to determine whether the improved Schedule K-1 data, perhaps combined with other IRS information about businesses and taxpayers, could be used more effectively to ensure compliance with the reporting of flow-through income.

    Agency Affected: Department of the Treasury: Internal Revenue Service


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