Montana has a state income tax, and it applies to most residents and workers

Montana collects a state income tax on wages, salaries, interest, dividends, and other income. The state does not have a sales tax, but it does tax income at rates that vary based on how much you earn. If you live in Montana or work there, you will likely owe state income tax unless your income falls below the filing threshold for your situation.

The tax is progressive, meaning the rate increases as your income increases. Montana has multiple tax brackets, and the exact amount you owe depends on your filing status (single, married filing jointly, head of household, or married filing separately) and your total income for the year.

Key Takeaways

  • Montana taxes income at rates ranging from 2% to 6.9%, depending on your income level and filing status.
  • The state has no sales tax, but property taxes and other taxes exist alongside the income tax.
  • You must file a Montana state tax return if your income exceeds the threshold for your filing status, even if you do not owe federal tax.
  • Montana allows a tax credit for taxes paid to other states, which matters if you work in another state but live in Montana.
  • Retirees may be able to exclude certain retirement income from Montana taxation under specific conditions.

Montana's tax brackets and rates for the current year

Montana's income tax brackets change each year based on inflation adjustments. The state uses six tax brackets, with rates starting at 2% on the lowest income and reaching 6.9% on the highest. The exact dollar amounts where each bracket begins depend on your filing status.

For example, a single filer in 2024 might pay 2% on income up to a certain threshold, then 3% on the next portion, and so on. A married couple filing jointly reaches the same top rate but at a higher income level. You can find the current year's brackets on the Montana Department of Revenue website, which publishes them annually.

Montana also allows a standard deduction, which reduces the income you actually pay tax on. The standard deduction amount varies by filing status and age, and it is adjusted each year for inflation.

Who must file a Montana state tax return

You must file a Montana return if your income exceeds the filing threshold for your situation. The threshold depends on your filing status, age, and type of income. A single person under 65 with only wage income has a different threshold than a married couple filing jointly or a person over 65.

Even if you do not owe Montana tax, you may need to file to claim a refund of taxes withheld from your paychecks. If your employer took Montana tax out of your wages but you ended up not owing any tax, filing gets that money back to you.

Montana residents who work in other states may also need to file a Montana return even if they paid tax to another state. Montana allows a credit for taxes paid to other states, but you have to file to claim it.

Montana's treatment of retirement income

Montana offers a partial exclusion for certain retirement income, which can reduce the amount of tax you owe if you are retired. Specifically, you may be able to exclude a portion of income from pensions, annuities, and distributions from retirement accounts, but the rules have income limits and other conditions.

The exclusion is not automatic — you have to claim it on your return. The amount you can exclude depends on your age, your total income, and the type of retirement income. Some types of retirement income may have access to for the exclusion while others do not.

If you receive Social Security benefits, those are generally not taxed by Montana, though they may be taxed federally depending on your total income. It is worth reviewing your specific situation with a tax preparer or the Montana Department of Revenue to understand what portion of your retirement income is subject to state tax.

No sales tax, but other Montana taxes exist

While Montana has no statewide sales tax, the state does collect other taxes. Property tax is significant in Montana and is assessed by counties on real estate and some personal property. The rate varies by county and by the type of property.

Montana also taxes certain specific items and activities: fuel excise tax, cigarette and tobacco tax, alcohol tax, and gambling tax. Businesses pay corporate income tax and various licensing fees. If you own property or operate a business in Montana, these taxes may apply to you even though there is no sales tax.

How to file Montana state taxes

You can file your Montana return on paper or electronically. The state accepts returns through its own system or through third-party software that is certified to file Montana returns. If you use tax software, make sure it includes Montana state tax preparation.

Montana returns are filed with the Montana Department of Revenue. The deadline to file is the same as the federal deadline, usually April 15, though it can shift if that date falls on a weekend or holiday. If you need more time, you can request an extension, which gives you until October 15 to file.

If you are unsure whether you need to file or have questions about your specific situation, the Montana Department of Revenue has a phone line and website with resources. Some community organizations and libraries also offer free tax preparation help for people with lower incomes.

Frequently Asked Questions

Do I have to pay Montana income tax if I just moved there?

You owe Montana tax on income earned while you are a resident. If you moved partway through the year, you file as a part-year resident and only pay tax on income earned after you moved. You will need to show when you established residency, so keep records of your move.

What if I work in another state but live in Montana?

You may owe tax to both states. Montana allows a credit for taxes paid to other states, which reduces what you owe Montana. You file a return in both states and claim the credit on your Montana return. The credit cannot exceed the Montana tax you owe.

Can I deduct federal taxes from my Montana income?

No. Montana does not allow you to deduct federal income tax paid when calculating your Montana tax. You calculate Montana tax on your federal taxable income, not on your gross income, but federal tax itself is not deductible.

Is there a penalty if I file late?

Yes. Montana charges penalties and interest if you file late or pay late. The penalty is a percentage of the unpaid tax, and interest accrues daily. If you cannot file by the deadline, requesting an extension before April 15 can reduce penalties.

Do I need to file if I had no income?

Generally no, unless you are claiming a refund of taxes withheld. If your employer took Montana tax out of your paychecks but you earned no income or very little income, filing gets that money back to you.