Did you submit your information through one of the non-filer applications in order to get your stimulus payment? There are non-filer options either through TurboTax or the IRS.
If so, when using the non-filer system on the IRS website, your information is processed by the IRS as an original filed return.
Any subsequent filing submitted electronically will be rejected and must be mailed to the IRS for processing.
You MUST complete an amended return Form 1040X per the IRS : https://www.irs.gov/taxtopics/tc308
If you discover an error after filing your return, you may need to amend your return. The IRS may correct mathematical or clerical errors on a return and may accept returns without certain required forms or schedules. In these instances, there's no need to amend your return.
However, do file an amended return if there's a change in your filing status, income, deductions, or credits.
Don't forget that when you mail a paper return to the IRS, you must include copies of your W-2s and 1099s, plus you need to sign and date the return.
