SOI Tax Stats - Private foundations study data sources and limitations

Description of the sampling methodology and data sources and limitations for SOI's annual study of private foundations and nonexempt charitable trusts
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SOI Tax Stats - Exempt Organizations study data sources and limitations

Explanation of data sources and limitations of the Statistics of Income exempt organizations study data.
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SOI Tax Stats - Compendium of Federal Transfer Tax and Personal Wealth Studies, Volume 2

Compendium of Federal Estate Tax and Personal Wealth Studies
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Tax Professionals

SOI Tax Stats - Affordable Care Act (ACA) statistics: Individual income tax items

SOI Tax Stats - Affordable Care Act (ACA) Statistics: Individual Income Tax Items
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