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.This interview will help you determine if you should file an amended return to correct an error or make other changes to your return. 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. File an amended return if there's a change in your filing status, income, deductions, credits, or tax liability. Complete your amended return as if you are filing the return for the first time. Submit all the forms relevant to the information in your amended return. Access IRS forms, instructions and publications in electronic and print media. You can check the status of an amended return around 3 weeks after you submit it. You should generally allow 8 to 12 weeks for your Form 1040-X to be processed.