The key word is IF...... If "Amended Return" checkbox is not checked, then taxpayer TIN in the Return Header must not be the same as a TIN of a previously accepted electronic return for the return type and tax period indicated in the tax return.
Is it possible that someone else filed a return with your SSN? It could have been a typo, or something worse. I suggest you print, sign and file by mail. Get a USPS Tracking Number, And watch your credit reports.
