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IRS tax forms are used for taxpayers and tax-exempt organizations to report financial information to the Internal Revenue Service (IRS) of the United States. They are used to report income, calculate taxes to be paid to the federal government, and disclose other information as required by the Internal Revenue Code (IRC). There are over 800 various forms and schedules. Other tax forms in the United States are filed with state and local governments.

Form 1040, U.S. Individual Income Tax Return, is one of three forms (1040 [the "Long Form"], 1040A [the "Short Form"] and 1040EZ - see below for explanations of each) used for personal (individual) federal income tax returns filed with the IRS. The first Form 1040 was published for use for the tax years 1913, 1914, and 1915. For 1916, Form 1040 was converted to an annual form (i.e., updated each year with the new tax year printed on the form). Initially, the IRS mailed tax booklets (Form 1040, instructions, and most common attachments) to all households. As alternative delivery methods (CPA/Attorneys, Internet forms) increased in popularity, the IRS sent fewer packets via mail. In 2009 this practice was discontinued.

Income tax returns for individual calendar year taxpayers are due by April 15 of the next year, except when April 15 falls on a Saturday, Sunday, or a legal holiday. In those circumstances, the returns are due on the next business day. An automatic extension until Oct. 15 to file Form 1040 can be obtained by filing Form 4868.

Form 1040 consists of two full pages not counting attachments. The first page collects information about the taxpayer(s), dependents, income items, and adjustments to income. The second page calculates the allowable deductions and credits, tax due given the income figure, and applies funds already withheld from wages or estimated payments made towards the tax liability. At the top of the first page is the Presidential election campaign fund checkoff, which allows taxpayers to designate that the federal government give $3 of the tax it receives to the Presidential election campaign fund.

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