Generally yes, if you have rental income in Montana, you would need to file a return to show the expenses that reduce your income even if it is negative. If your income is was lower than your filing threshold for Montana you will not need to file.
Montana uses your federal wages, then makes adjustments from there. If your federal income from the rental is showing as $0, then you would not need to file a Montana return.
If your federal income was showing profit from the rental property and you needed to make adjustments to lower the income with Montana deductions, then you would need to file a Montana return to claim the deductions that would lower the income.
(Edited 4/4/23 @1:03PM PST)
@dagmar22
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