SOI tax stats - Individual statistical tables by size of adjusted gross income

Individual Tax Statistics - Data by Size of Income.
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SOI tax stats - Foreign recipients of U.S. partnership income statistics

Foreign recipients of U.S. partnership income statistics
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Tax Professionals

SOI Tax Stats - Information Reporting Program - IRS Data Book Table 24

Information Reporting Program by Fiscal Year
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Tax Professionals

SOI tax stats - Selected online taxpayer assistance, by type of assistance - IRS Data Book Table 10

SOI tax stats - Selected online taxpayer assistance, by type of assistance
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Tax Professionals

SOI Tax Stats - Appeals Workload, by Type of Case, IRS Data Book Table 29

SOI Tax Stats - Appeals Workload, by Type of Case
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SOI Tax Stats - Criminal Investigation Program, by Status or Disposition - IRS Data Book Table 26

Criminal Investigation Program, by Status or Disposition and Fiscal Year
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SOI Tax Stats - Costs Incurred by Budget Activity - IRS Data Book Table 32

Costs Incurred by Budget Activity
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SOI Tax Stats - Collections Costs Personnel and US Population - IRS Data Book Table 33

Collections, Costs, Personnel, and U.S. Population, by Fiscal Year
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IRS - Taxpayer compliance research

Find articles and publications on research about taxpayer behavior in complying with the tax laws. This includes information on compliance measurement (i.e., the tax gap) and the determinants of taxpayer compliance.
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SOI Tax Stats - Amount of refunds issued, including interest, by state - IRS Data Book Table 8

Amount of Refunds Issued, Including Interest, by State
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