Yes, you are correct, the Military Retirement Income subtraction can be found on MD Form 502SU, Line u and flows to Line 13 of Form MD 502. Maryland allows individuals at least 55 years of age on the last day of the taxable year to take a subtraction for up to $20,000 of military retirement income. Individuals under age 55 may claim a subtraction of up to $12,500.
To trigger this subtraction in TurboTax, you need to walk through the interview questions after you enter your Form 1099-R. When you come to the question Where is your distribution from? choose Active or reserve military retirement.

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