It may depend on which box $$ are being subtracted.....and you have not indicated whcih box $$ are doing this
1) All of box 3 $$ would be subtracted.
2) Some of box 8 $$ might be subtracted if you held some MD Muni bonds...or all would be subtracted if you indicated that all of box 8 $$ came only from MD Muni bonds you owned. If you owned a mixture of MD and non-MD Muni bonds, you needed to answer a follow-up question as to what $$ amounts in box 8 came from MD Muni bonds (or a US territory, like Puerto Rico), and what $$ amount came from "Multiple States".
3) Box 1 $$ would only be subtracted if you indicated that those $$ came from certain DC area taxable bonds.
___________
All else fails, delete the 1099-INT and re-enter it manually. If the error continues, and is associated with the box 8 $$ amounts...you may need further instructions..
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
