Just so I understand your answer @DaveF1006 , consider the following hypothetical: I lived half the year in Maryland and half the year in Pennsylvania. I get my Form 1099 and it says I earned $1,000 ...
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Just so I understand your answer @DaveF1006 , consider the following hypothetical: I lived half the year in Maryland and half the year in Pennsylvania. I get my Form 1099 and it says I earned $1,000 in interest on a money market fund. I look up the supplemental information from the fund sponsor, and I see that 85 percent of the interest for this fund consists of interest on U.S. government obligations in 2025. I work on my federal return, and get to the screen in TurboTax that prompts me for interest on U.S. government obligations. I multiply 85 percent times $1,000 and enter $850. When I get to my state return for Maryland, I have to figure out how much income I earned while living in Maryland. My income for Maryland totals $50,000, including $500 in interest from my money market fund. TurboTax carries over the $850 dollars I entered in the interview for my federal return and subtracts all of it from my Maryland income. So the program deducts not only the entire $500 of interest on my money market fund, but also an additional $350. My income for Pennsylvania totals another $40,000, including the remaining $500 in interest from my money market fund. When I get to my Pennsylvania return, TurboTax applies some kind of calculation and deducts some percentage (less than 100%, let's say 50%) of my interest on U.S. government obligations that works out to $425. As a result, I've now earned $1,000 of interest on my money market fund, deducted $1,275 of interest on U.S. government obligations from the two states combined, and deducted more interest on U.S. government obligations in Maryland than the total money market interest I earned in Maryland. Correct result?