Get Form 1120 Instructions

How to file Form 1120. You have the option to file Form 1120 either online or by mail. Because it's faster, easier, and cuts back on paperwork, we always recommend filing online using the IRS efile service. Plus, some large C corporations reporting $10 million or more in assets are required to file online.

Providers and Large Taxpayers authorized to participate in the Internal Revenue Service e-file program can file Forms 1120 (U.S. Corporation Income Tax Return), 1120-F (U.S. Income Tax Return of a Foreign Corporation), and 1120-S (U.S. Income Tax Return for an S Corporation) through Modernized e-File.

Purpose of Form Use Form 1120-L to report the income, gains, losses, deductions, credits, and to figure the income tax liability of life insurance companies.

When a business is legally structured as a corporation, it must also choose between a C-Corp or an S-Corp status. In the U.S., C-corporations report their tax information using Form 1120. A business organized as an S-Corp will file a different annual tax form, Form 1120-S.

Form 1120-C If the corporation's principal business, office, or agency is located in:Use the following IRS center address:The United StatesDepartment of the Treasury Internal Revenue Service Ogden, UT 84201-0012A foreign country or U.S. possessionInternal Revenue Service PO Box 409101 Ogden, UT 84409 Oct 31, 2023

If you are taxed as a C-Corp, you need to file a Form 1120, you must file it by the 15th day of the forth month following the close of the tax year, which for most taxpayers is April 15 or the next business day if it falls on a weekend or holiday.

C corporations must file Form 1120 each year, whether or not they have taxable income for that period.

Those corporations with $10 million or more in total assets, and that file 250 or more returns a year, are required to electronically file their Form 1120, 1120F, and 1120S.