Taxes Form 1040, Form 1040x, Form 1040 SR, and Form 1040 NR
Federal tax Form 1040, also known as the “U.S. Individual Income Tax Return,” is the standard federal income tax form used by American taxpayers to file their annual income tax returns. It’s the mother of all tax forms as it’s used to report a taxpayer’s tax details to the Internal Revenue Service (IRS).