Montana has made the following changes for the 2025 tax year.
Filing Statuses
Under new law, Montana taxpayers must use the same filing status as their federal return.
Filing Requirements
The Montana filing requirements now follow the federal filing requirements.
Tax Rates
Legislative changes
- House Bill 845 increased the maximum subtraction a taxpayer may take for contributions to a 529 plan. For tax year 2025, the maximum contribution amount has increased from $3,000 to $4,500 (up to $9,000 if filing jointly).
- Senate Bill 93 removes the expiration date for the military retirement income and survivor’s benefits subtraction.
- Senate Bill 544 provided a transition adjustment for Montana net operating losses (NOL). This adjustment is the difference of the amount of a federal NOL and a Montana NOL as of December 31, 2023. Taxpayers must have made the election to make the transition adjustment by October 15, 2025, on their 2024 tax return. Any unused amounts of the adjustment may be carried forward for up to seven years.
Additional Information
For a list detailing what's new for Montana in 2025, please click here.