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 Tax Topic 356, Decedents.

References:

• Tax Topic 356, Decedents

Source: www.irs.gov