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The Daily Insight

Is a corporation required to file a tax return?

Author

Sarah Duran

Published Mar 22, 2026

Under the tax code, every U.S. corporation that’s in business to make a profit must file a tax return regardless of whether it made any money. This applies both to traditional corporations and Subchapter S corporations.

All corporations are required to file a corporate tax return, even if they do not have any income. If an LLC has elected to be treated as a corporation for tax purposes, it must file a federal income tax return even if the LLC did not engage in any business during the year.

How does a corporation file taxes?

The corporation must file a corporate tax return, IRS Form 1120, and pay taxes at a corporate income tax rate on any profits. If a corporation will owe taxes, it must estimate the amount of tax due for the year and make quarterly payments to the IRS by the 15th day of the 4th, 6th, 9th, and 12th months of the tax year.

What tax forms does a corporation need to file?

Here is a brief overview of the tax forms a typical S corporation needs to file with the IRS.

  • Form 2553 – S Corporation Election.
  • Form 1120S – S Corporation Tax Return.
  • Schedule B – Other Return Information.
  • Schedule K – Summary of Shareholder Information.
  • Schedule K-1 – Individual Shareholder Information.

What kind of tax forms do I need to file as a corporation?

Affected corporations and partnerships are those with assets of $10 million or more that file Form 1120, 1120-PC, 1120-L, 1120S, or 1065. Certain other partnerships filing Form 1065 are also required to use the Schedule M-3.

When do I need to file a C Corp tax return?

Note: Form 1120 needs to be completed by the 15th of the third month after your corporation’s end tax year. For instance, if your company has a December 31 year-end tax time, you need to file a tax report by March 31. If you need to learn more about C corp tax filing, post your legal need to our UpCounsel marketplace.

Do you have to file a business tax return?

The answer is always “YES.” If you have income and fail to file an income tax return, you may incur fines and penalties from the IRS. Even if your business has a loss, or your business was inactive, you must file a tax report. A business loss may actually help you because it can reduce your total income on your personal tax return.

When to file Form 1120 for Service Corporation?

Service corporations comprise of businesses whose employees a 95-percent minimum amount of time in the aforementioned fields. Note: Form 1120 needs to be completed by the 15th of the third month after your corporation’s end tax year. For instance, if your company has a December 31 year-end tax time, you need to file a tax report by March 31.