MD 502 "Subtractions from Maryland Income" line 13

[dazed---confused]

Why does the MD Form 502, line 13 mention "attached form 502SU" but Turbotax does not create one?

What does the code "AB" that Turbotax autofills into line 13 mean?

[SundayInSalem]

TurboTax should create Form 502SU if you have a subtraction on Form 502, line 13. 

Code "AB" is "Income from US Government obligations." For example, you may have reported dividends from a mutual fund that included US Government interest. US Government interest is not taxable to the state.

See: Topic No. 403 Interest Received