I am a resident of Montana serving in the U.S. armed forces. My spouse is a nonresident of Montana. We file a joint federal return. How do we file our Montana income tax return?
Married couples filing a joint federal return, where one is a Montana resident and one is a non-resident, must file the Montana income tax return as “married filing separately.” If both spouses have income reportable to Montana, then a return for each spouse must be filed. Otherwise, just the Montana resident must file a Montana return. Montana residents report their income from all sources to Montana regardless of what state or country the income is sourced from. This includes Montana military personnel stationed outside Montana.
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