Form 1040, U.S. Individual Income Tax Return
Have additional income, such as unemployment compensation, prize or award money, or gambling winnings. Have any deductions to claim, such as student loan interest deduction, self-employment tax, and educator expenses.
Owe other taxes, such as self-employment tax, household employment taxes, additional tax on IRAs or other qualified retirement plans and tax-favored accounts, AMT, or need to make an excess advance premium tax credit repayment.
Can claim any credit that you didn’t claim on Form 1040 or 1040-SR, such as the foreign tax credit, education credits, or general business credit. Have other payments, such as an amount paid with a request for an extension to file or excess social security tax withheld.
Source Page: https://www.irs.gov/forms-pubs/about-form-1040