SOI Tax Stats - Historic table 2

Statistics of Income tax statistics: Historic table 2
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Tax Professionals

SOI tax stats - Individual income tax returns complete report (Publication 1304) - Basic tables part 2

Contains complete individual income tax data. The statistics are based on a sample of individual income tax returns, selected before audit, which represents a population of Forms 1040, 1040-A, and 1040-EZ, including electronic returns. The report contains data on sources of income, adjusted gross income, exemptions, deductions, taxable income, income tax, modified taxable income, tax credits, self-employment tax, and tax payments.
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Individuals, Tax Professionals

SOI Tax Stats - Domestic private foundation and charitable trust statistics

Statistical tables and articles presenting Form 990-PF data for the following types of private foundations: Operating Foundations, Nonoperating Foundations, and Section 4947(a)(1) Nonexempt Charitable Trusts.
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SOI tax stats - Individual income tax returns

Individual tax returns article and related tables
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Statistics of Income Bulletin (Publication 1136) article topics

This is a link from the SOI Home Page and each of the Main Landing pages for SOI Bulletin articles by topic.
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SOI Tax Stats - IRS Data Books: 2003 - 2001

Look here for the 2001 - 2003 IRS Data Books (Publications 55B), with links to the 1995 to 2000 IRS Data Books. The tables shown in these publications contain statistics for IRS collections and refunds, as well as number of returns. There's also information on examination activities, taxpayer assistance, chief counsel, appeals, criminal investigation, and more.
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Tax Professionals