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If your e-filed (and accepted) tax return indicated you were deceased, then I would recommend filing an amended return to correct the error.

The "amended return" interview asks for the reason you are amending - enter "Erroneously reported that a taxpayer on the return was deceased."

If you are unable to e-file the amendment, then file it by mail with a short cover letter (nothing fancy) explaining why you had to amend.

Make sure you enter the correct information on the Personal Info interview. The second screen in that interview asks "Do any pf these apply to you?" and this is where the program asks about deceased taxpayers.  See the attached screenshot as an example.

Since the IRS coordinates its SSN records with the Social Security Administration, you may also need to contact them. See What should I do if I am incorrectly listed as deceased in Social Security’s records? for instructions.