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While people with income under a certain amount aren't required to file a tax return because they won't owe any tax, if you qualify for certain tax credits or already paid some federal income tax, the IRS might owe you a refund that you can only get by filing a return.

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

IRS Publication 6149 contains multi-year projections of the number of tax returns to be filed with the IRS by state¡ªas determined by the addresses on the tax returns.

SOI Tax Stats - Examination Coverage: Returns Examined Involving Protection of Revenue Base , by Type of Size of Return and Fiscal Year

Returns of tax-exempt organizations, employee retirement plans, government entities, and tax-exempt bonds examined, by type of return

IRS Publication 6186 contains multi-year projections of the number of tax returns to be filed with the IRS by the calendar year of filing.

IRS Publication 6292 contains multi-year projections of the number of tax returns to be filed with the IRS by fiscal year of filing.

IRS Publication 6187 contains multi-year projections of the number of individual Form 1040 series returns to be filed with the IRS by major processing categories important to IRS planning operations.

Nonfarm Sole Proprietorship returns bulletin article and related tables.

These tables present information from the population of all Forms 1040 processed by the IRS on or before week 30 of the calendar year. Returns filed primarily reflect income earned in the respective Filing Year, but exclude taxpayers who requested a 6-month filing extension by filing Form 4868, Application for Automatic Extension of Time To File U.S. Individual Income Tax Return.