The amount of SSA credit would be whatever the taxable amount is on your Federal return. It will show as a subtraction on Schedule 1.
If the older of you or your spouse (if married filing jointly) was born during the period January 1, 1946, through December 31, 1952, and reached the age of 67, you are eligible for a deduction against all income and will no longer deduct retirement and pension benefits. Complete Schedule 1, line 23 instead of Michigan Pension Schedule, Form 4884.
The deduction is $20,000 for a return filed as single or married, filing separately, or $40,000 for a return filed as married, filing jointly. If you checked either SSA Exempt box 22C or 22G from Schedule 1, your deduction is increased by $15,000. If you checked both boxes 22C and 22G your deduction is increased by $30,000.
The standard deduction is reduced by military pay (included on Schedule 1, line 14), military and/or railroad retirement benefits (both reported on Schedule 1, line 11)
Taxpayers born January 1, 1953 through January 1, 1955 should not file Form 4884. Instead, taxpayers may be eligible for a Tier 3 Michigan Standard Deduction. This deduction is up to $20,000 for a return filed as single or married filing separately, or up to $40,000 for a married filing jointly return. Exemption(s) claimed on MI-1040, lines 9a and 9d, taxable Social Security benefits, military compensation (including retirement benefits), Michigan National Guard retirement benefits and railroad retirement benefits included in AGI may reduce the amount eligible to be claimed on this line.