**GAO-08-728**                      Published: Jun 13, 2008. Publicly Released: Jul 16, 2008.                  

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## Highlights

The Internal Revenue Service (IRS) estimated that $33 billion in income tax assessments was not paid in 2001. If not collected, annual unpaid taxes keep accumulating each year along with penalty and interest charges to create an inventory of "tax debts," which approached $300 billion at the end of fiscal year 2007. IRS has shelved or delayed collection of billions of dollars of this tax debt. Congress and others have questioned IRS's collection process's effectiveness. As requested, GAO is reporting on (1) the process IRS uses to collect unpaid tax debts; (2) trends in the unpaid tax debt inventory, collections, and other resolutions from fiscal years 2002 through 2007; and (3) the performance measures and goals available to assess how well the collection process works overall. To meet these objectives, GAO interviewed IRS officials and reviewed IRS's unpaid assessments database, documentation on the collection process and factors used in managing it, and IRS's highest-level collection measures.

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## Topics

Tax Policy and Administration

Collection proceduresCost analysisCost effectiveness analysisDebt collectionDelinquent taxesGovernment collectionsInternal controlsPerformance measuresRisk assessmentRisk managementTax evasionTax nonpaymentTax violationsTaxesTaxpayersBenefit-cost trackingProgram goals or objectivesProgram implementation