Many find the easiest way to figure the entries for Form. X is to first make the changes in the margin of the return they are amending.When filing an amended North Carolina individual income tax return, fill in the "Amended Return" circle located at the top right of Form D-400. Where can I find more information about amending my return? You can now file Form 1040X electronically with tax filing software to amend your Form 1040, 1040SR, or 1040NR for the current or two prior tax periods. File an amended return if there's a change in your filing status, income, deductions, credits, or tax liability. To claim a refund, you must file an amended return within 3 years after the date you filed your original return or 2 years after the date you paid the tax. If you are amending a 2019 return, only complete through. Amended return filing status. No additional form or paperwork is required.