Form 1120-S U.S. Income Tax Return for an S Corporation can be amended by clicking the Checkbox next to Amended Return, on page 1 section H.

To access this checkbox through the Q&A:

1. From within your TaxAct 1120-S return (Online or Desktop), click Filing , then click Amend Federal Return (on smaller devices, click in the top left corner of your screen, then click Filing).
2. Continue with the interview process until you reach the screen titled Amended Federal Return - Complete Worksheet 1120SX, then click the Checkbox next to Amended Federal Return.
3. Continue with the interview process and file the amended return.

You will need to attach an explanation of changes, and if the income, deductions, or credits changed, then a new Schedule K-1 (Form 1120-S) Shareholder’s Share of Income, Deductions, Credits, etc. must be filed and copies sent to the shareholders.

TaxAct supports the e-filing of amended S Corporation returns. At the end of the Amended Federal Return section, you will be prompted to select either Paper Filing or Electronic Filing.

Note. Before mailing the return(s), be sure to review the paper-filing instructions.