Minnesota requires a final state income tax return for a deceased taxpayer in the year of their death if a federal income tax return is required for that year. Complete and enclose Form M23 and a copy of the death certificate when you file the deceased person's property tax refund return.For paper returns, the filer should write the word deceased, the deceased person's name and the date of death across the top. Statement of Person Claiming Refund Due a Deceased Taxpayer. More In Forms and Instructions. The final return is due on April 15 of the year following the person's death. The tax year ends on the date of death. File the final income tax returns of a deceased person for current and prior years, pay any balance due and claim the refund. You should also complete and file with the final return a copy of Form 1310, Statement of Person Claiming Refund Due a Deceased Taxpayer. Write the word "DECEASED," the decedent's name, and the date of death across the top of the tax return.