Signing the Return (2004 IRS FAQ)
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IRS FAQ 1.14 IRS Procedures: Signing the Return
My husband passed away last year, and I will be filing a joint return. Are any special return notations required to indicate my husband is deceased?
If you are a surviving spouse filing a joint return and no personal representative has been appointed, you should sign the return and write in the signature area, "filing as surviving spouse." The final return should have the word "Deceased," the decedent's name, and the date of death written across the top of the return. For additional information, refer to Decedents, Decedents.
References:- Decedents, Decedents
Source: IRS.gov