Montana does have a state income tax

Montana charges a state income tax on wages, self-employment income, interest, dividends, and other earnings. The tax rate depends on how much you earn — Montana uses a progressive system with brackets that range from 2% on the lowest incomes to 6.9% on the highest. Unlike some states, Montana does not have a separate sales tax or capital gains tax, which affects how your total state tax burden works out.

If you work in Montana or live there, you will owe state income tax on most types of income. The state also taxes retirement income, including Social Security benefits in some cases, though Montana offers a partial exemption for Social Security that many retirees can use.

Key Takeaways

  • Montana's state income tax ranges from 2% to 6.9% depending on your income bracket, with rates applied progressively to higher earnings.
  • Montana has no sales tax or capital gains tax, so income tax is the primary way the state collects revenue from residents.
  • Social Security benefits are taxable in Montana, but the state offers a partial exemption that reduces or eliminates the tax for many retirees.
  • Your employer will withhold Montana state income tax from your paycheck if you work in the state, similar to federal withholding.
  • Self-employed people and business owners in Montana must pay quarterly estimated taxes if they expect to owe more than a certain amount.

Montana's income tax brackets and rates

Montana's income tax brackets change each year because they are adjusted for inflation. For the 2024 tax year, the brackets start at 2% for the lowest earners and increase in steps to 6.9% for the highest bracket. The exact dollar amounts where each bracket begins shift annually, so the income level that puts you in the 4% bracket this year may be different next year.

The progressive system means you do not pay the top rate on all your income — only on the portion that falls within each bracket. For example, if you earn $50,000, you pay 2% on the first portion, then 4% on the next portion, and so on, depending on where the brackets fall that year. This is different from a flat tax, where everyone pays the same percentage regardless of income.

You can find the current year's brackets on the Montana Department of Revenue website, which updates them annually. The brackets explore whether you file as single, married filing jointly, head of household, or another filing status.

How Montana's lack of sales tax affects your total tax burden

Montana is one of five states with no sales tax at all. This means you do not pay a percentage tax when you buy groceries, clothing, gas, or other goods in the state. Some people assume this makes Montana a low-tax state overall, but that is not always true — the state makes up the difference through its income tax, which is higher than in some states that have both income and sales taxes.

The absence of sales tax does mean your take-home pay goes further on everyday purchases. If you earn $40,000 in Montana and spend most of it locally, you keep more of each dollar compared to a state where you would pay 6% or 7% sales tax on most purchases. However, you still owe the state income tax on that $40,000 of earnings.

Montana also has no capital gains tax, which means you do not owe state tax when you sell stocks, real estate, or other investments at a profit. This is unusual — many states tax capital gains as income. For people who invest or own property, this can be a significant advantage.

Social Security and retirement income taxation in Montana

Montana taxes Social Security benefits, but the state offers a partial exemption that shields much or all of it from taxation for many retirees. The exemption depends on your total income and filing status. If your income is below a certain threshold, you may owe no state tax on your Social Security at all. If your income is higher, a portion of your benefits becomes taxable.

Other retirement income — such as distributions from traditional IRAs, 401(k)s, and pensions — is also taxable in Montana. However, the state offers a pension exemption that allows you to exclude a portion of retirement income from taxation. The amount you can exclude depends on your age and the type of retirement income.

If you are retired and receive multiple sources of income, it is worth calculating your total tax liability with the exemptions in mind. The Montana Department of Revenue publishes worksheets and instructions that walk through the calculation, or you can work with a tax preparer familiar with Montana's rules.

Paycheck withholding and estimated taxes in Montana

If you work for an employer in Montana, your employer will withhold state income tax from your paycheck along with federal withholding. You provide a Montana W-4 form (the state version, not the federal one) to tell your employer how much to withhold. If you do not fill one out, your employer will withhold based on a default calculation.

Many employees have the right amount withheld and receive a refund or owe a small amount when they file their return. If you have a large refund every year, you can adjust your W-4 to have less withheld and keep more in each paycheck. If you owe a lot at tax time, you can adjust it the other way.

Self-employed people and business owners in Montana must pay quarterly estimated taxes if they expect to owe more than a certain threshold. These are payments you make directly to the Montana Department of Revenue four times a year — roughly in April, June, September, and January — rather than having an employer withhold for you. If you do not pay enough throughout the year, you may owe a penalty when you file your annual return.

Filing your Montana state income tax return

Montana residents and anyone who earned income in the state must file a Montana income tax return if their income exceeds the filing threshold. The threshold varies by age and filing status — it is higher for people over 65 and for married couples filing jointly than for single filers. You can find the current year's threshold on the Montana Department of Revenue website.

You file your Montana return using Form 2, the Montana Individual Income Tax Return. You will need your federal tax information, because Montana income is based on federal taxable income with some adjustments. The important date to file is the same as the federal important date — typically April 15 — unless you request an extension.

Montana allows you to file electronically through approved software or through a tax preparer. If you file electronically, you can receive a refund faster than if you mail a paper return. The state also offers free tax preparation through the Volunteer Income Tax information (VITA) program if your income is below a certain level.

Deductions and credits available to Montana taxpayers

Montana offers several deductions and credits that can reduce your state tax bill. The state allows a standard deduction similar to the federal one, or you can itemize deductions if that results in a larger reduction. Montana also has credits for things like dependent care expenses, education costs, and property taxes paid.

One credit unique to Montana is the Earned Income Tax Credit (EITC), which is a state version of the federal credit. If you have low to moderate income and work, you may be able to claim this credit to reduce your tax or increase your refund. The amount depends on your income, filing status, and number of dependents.

Montana also offers credits for contributions to certain savings accounts and for energy-efficient home improvements. The rules and amounts change periodically, so it is worth checking the Montana Department of Revenue website or speaking with a tax preparer to see which credits explore to your situation.

Frequently Asked Questions

Does Montana tax Social Security benefits?

Yes, but Montana offers a partial exemption that reduces or eliminates the tax for many retirees. The exemption amount depends on your total income and filing status. If your income is below a certain threshold, you may owe no state tax on your benefits at all.

What is Montana's highest income tax rate?

Montana's highest state income tax rate is 6.9%, which applies to the highest income bracket. The exact income level where this rate begins changes each year due to inflation adjustments. You can find the current brackets on the Montana Department of Revenue website.

Do I have to pay Montana state tax if I work remotely for an out-of-state company?

If you live in Montana and work remotely, you owe Montana state income tax on your wages, even if your employer is based elsewhere. Montana taxes income earned by residents regardless of where the employer is located. Your employer may not withhold Montana tax, so you may need to pay estimated taxes or settle the amount when you file your return.

Is there a penalty for not paying estimated taxes in Montana?

Yes, if you do not pay enough estimated tax throughout the year, the Montana Department of Revenue may charge a penalty and interest on the unpaid amount. The penalty is calculated based on how much you underpaid and how late the payment was. You can avoid the penalty by paying enough in estimated taxes or by having sufficient withholding from other income.

Can I deduct property taxes on my Montana state return?

Yes, Montana allows you to deduct property taxes paid on your home and other real property. You can claim this deduction as part of your itemized deductions, or you may be able to claim a property tax credit depending on your income and filing status. The rules vary, so check with the Montana Department of Revenue or a tax preparer.