Are you asking how to ensure that Treasury interest is not reported as income on a Maryland return?
As other users in this discussion thread have mentioned, if Treasury interest is reported in Box 3 of Form 1099-INT, then it should automatically be excluded from State income, since it is excluded from all states' income.
Each state return in TurboTax has a customized questionnaire based on that state's laws.
If you had income from Treasury obligations, and you were not a full-year resident of Maryland, the questionnaire will ask you to enter how much of the Treasury interest income was from outside Maryland.
After asking about any part-year resident allocations, the Maryland questionnaire will display a screen with a complete list of items treated differently by Maryland. Choose the Start button next to any that apply to your situation.
See this Comptroller of Maryland webpage for more information about Maryland state taxes for 2023.
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