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About Publication 501, Dependents, Standard Deduction, and Filing Information

Publication 501 discusses some tax rules that affect every person who may have to file a federal income tax return.

SOI Tax Stats - Definitions of selected terms and concepts for tax-exempt organizations

SOI Tax Stats - Charities, Business Leagues, and Other Tax-Exempt Organizations Selected Terms and Concepts
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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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Tax Professionals

SOI Tax stats IRS data book glossary of terms

SOI Tax stats - IRS data book glossary
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Tax Professionals

SOI Tax Stats - Definitions of selected terms and concepts for income from trusts and estates

SOI Tax Stats - Income from Trusts and Estates Study Terms and Concepts
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SOI Tax Stats - Private foundations study terms and concepts

Selected terms and concepts metatdata page for the Statistics of Income study of private foundations
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SOI tax stats: What's new

Brief descriptions of recent major additions to tax stats are shown here.
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Tax Professionals