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I am a senior in MD and turbotax appears to be including the 1099-INT amount  in the 'SUBTRACTIONS FROM MARYLAND INCOME' section -- lowering my MD AGI. The difference between my calculations and what I am seeing on Turbo Tax equal the exact 1099-INT number.

 

But I cannot find any firm documentation to support that subtraction, nor understand on which line it is being noted on my MD502. I want to understand this.

 

Would it be something on the MD502SU form, like "Net subtractions from income reported by a fiduciary."? Can anyone help?