Most unpaid taxes stem from taxpayers reporting less income than they earned

Unpaid Taxes, by Reason (Billions of Dollars)

Source: Internal Revenue Service Embed Download image
Notes: Estimates are averages of the projected gross tax gap in tax years 2020 and 2021. Employment taxes include Social Security, Medicare, and federal unemployment taxes. The Internal Revenue Service does not estimate how many corporations failed to file. Estate, gift, and excise taxes are not shown.