If your only income is SSDI then you had no income tax return to file for the state or feds so that question would not be asked at all. The MN credit form is filed independently of the income tax return and can be done for free on the MN website here :
You can file your M1PR free of charge at the MN Dept. of Revenue Property Tax Refund site, and if you're a homeowner, you can e-file it through the MN DOR's Property Tax Refund Online Filing System.
