If you filed your New Mexico personal income tax (PIT-1) return and you need to change at least one of the following, you must file a New Mexico PIT-X, an amended New Mexico personal income tax return:
- Your reported federal taxable income
- New Mexico taxable income, credits, or rebates
- New Mexico tax due
At the top right of PIT-X, page 2, next to Reason for amending, describe the reason you are amending your return.
When To Attach Amended Federal Return
If your New Mexico amended return shows changes as the result of filing an amended federal return, attach a copy of your federal amended forms and schedules.
NOTE: The law requires you to file an amended New Mexico return within 180 days of the date an adjustment to your federal return becomes final.