As of today, Form 14039, Identify Theft Affidavit, will be available in TurboTax on February 25, 2021.
According to the instructions for Form 14039, Identity Theft Affidavit, you can submit by either mail or FAX. See the link above for the address and FAX number.
Form 14039 is used when an e-Filed return is rejected because of a duplicate filing under your SSN, or you’re instructed to do so.
