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These tables below were originally published in the IRS Data Book, which is IRS Publication 55B, and are complied by various divisions throughout the IRS. The IRS's fiscal year runs from October 1 to September 30.

Enforcing Laws

Examination Coverage

Examination Coverage: Recommended and Average Recommended Additional Tax After Examination
by Type and Size of Return and Fiscal Year

Examination Coverage: Individual Income Tax Returns Examined
by Size of Adjusted Gross Income and Fiscal Year

Returns Examined with Unagreed Recommended Additional Tax After Examination
by Type and Size of Return and Fiscal Year

Returns Examined Involving Protection of the Revenue Base
by Type and Size of Return and Fiscal Year

Examination Coverage: Returns Examined Resulting in Refunds
by Type and Size of Return and Fiscal Year

• Returns Examined by Type of Return and Internal Revenue Region, District, and Service Center and Fiscal Year
1999     1998     1997      1996     1995

Returns of Tax-Exempt Organizations, Employee Plans, and Government Entities Examind
by Type of Return and Fiscal Year

•  Returns of Tax-Exempt Organizations and Employee Plans Examined, and Recommended Additional Tax After Examinatinon,
by Type of Examination and Fiscal Year
2005     2004     2003     2002     2001     2000     1999     1998

Determination Letters Issued on Employee Pension Plans
by Type and Disposition of the Plan and Fiscal Year

Tax-Exempt Guidance and Other Regulatory Activities

Applications for Tax-Exempt Status
by Organization Type and Internal Revenue Code Section and Fiscal Year

Tax-Exempt Organizations and Non-Exempt Charitable Trusts

Delinquent Collection Activities

Criminal Investigation Program
by Status or Disposition and Fiscal Year

Civil Penalties Assessed and Abated
by Type of Tax and Penalty and Fiscal Year

•  Additional Tax and Penalties Recommended After Examination
By Tax Class and by Internal Revenue Regions, Districts and Service Centers and Fiscal Year
1997     1996     1995

Information Reporting Program
In addition to receiving taxpayers' self-reported income and tax on those tax returns that are filed, the IRS receives independent information about income received and taxes withheld on informatino returns, such as Forms W-2 and 1099 from employers and other third parties.  With its Automated Underreporter Program, the IRS matches these information returns to tax returns and contacts taxpayer to resolve discripancies. 
By returns received, contacts, and additional tax and interest assessed

Math Errors on Individual Income Tax Returns
During the routine processing of tax returns, the IRS also checks for mathematical and clerical errors before refunds are paid,
By type of error