If you discover that you’ve made an error on your tax return, you may need to file an amended return. Though you don’t need to file if you’ve made a simple math error or left out forms (the IRS corrects for those automatically), you should file an amended return for any missed credits, deductions, filing status, or income.
- Use Form 1040X to file an amended return.
- You’ll need to use separate forms for each year that you need to amend.
- If you use any other forms or need to submit new documentation, attach them to the 1040X form.
- Pay any additional taxes you owe as soon as possible to avoid accruing additional interest and penalties.
* This information is not intended to be a substitute for specific individualized tax advice. We suggest that you discuss your specific tax issues with a qualified tax professional.
Tip adapted from IRS.gov
 IRS.gov, June 4, 2019