What happens if errors are made during the completion of Form 1120?

In such cases, you need to rectify the mistake by amending the form. Utilize Form 1120X, the Amended U.S. Corporation Income Tax Return, for this purpose. Form 1120X must be submitted within three years from the original return.

To complete Form 1120X, you'll need the following information:

1. Business name
2. Explanation of changes
3. Business address
4. Details on payments and credits
5. Data on income and deductions
6. Tax amount due or overpayment
7. Employer Identification Number (EIN)
8. Signature