Business

Form 1120: U.S. Corporation Income Tax Return

The primary tax return used by domestic C corporations to report income, gains, losses, deductions, and credits and to calculate corporate income tax liability.

Download Form 1120 PDFAbout on IRS.govInstructions PDF

Who Files This Form?

Domestic C corporations, unless exempt or required to file a special return.

Key Fields

  • Gross receipts/sales
  • Cost of goods sold
  • Taxable income
  • Total tax
  • Estimated tax payments
  • Overpayment/amount owed

Filing Deadlines

Due Date

April 15 (calendar year) or 15th day of 4th month after fiscal year end

With Extension

October 15 (calendar year)

Late Filing Penalty

Failure-to-file penalty of 5% per month (up to 25%); failure-to-pay penalty of 0.5% per month.

Related Forms

Form 1120-S

U.S. Income Tax Return for an S Corporation

Form 1065

U.S. Return of Partnership Income

Schedule K-1 (1065)

Partner's Share of Income, Deductions, Credits

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