Yes, you may need an Identity Protection PIN (IP PIN) or a signature PIN to e-file for a deceased person.
If the IRS issued them an IP PIN, which is a 6-digit number that the IRS provides to taxpayers to validate their identity, you must use it to avoid rejection.
If you are referring to the 5 digit pin which is an electronic filing pin that you create for your signature, you as the surviving spouse can signs on behalf of the deceased. The 5-digit PIN is a code that you select to electronically sign your tax return.
For joint returns, the survivor signs, and the deceased is marked as "Deceased".
For more information, review the IRS article Self-select PIN method for Forms 1040.
Here's some additional resources for you to review: Death in the Family, Can I e-file a tax return for someone who is deceased?
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