Check line 13 of your 1040 to see if you have a qualified business income deduction (QBID) of $9. Montana's Income Tax Simplification went into effect for 2024, so generally Montana taxable income should be the same as federal taxable income. Montana does not, however, offer the QBID so that amount has to be added back to get to your adjusted Montana taxable income.
This QBID could have flowed to you from various forms you may have reported on your tax return such as a Schedule K-1 or 1099-DIV. Most commonly, it's calculated based on net income from self employment.
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