Montana does have a state income tax

Montana charges a state income tax on wages, self-employment income, and other earnings. Unlike some states that tax only certain types of income, Montana taxes most forms of personal income the same way the federal government does. The state tax rate ranges from 1% to 6.9% depending on your income bracket, and you pay it in addition to federal income tax.

Montana's tax year runs January 1 through December 31, the same as federal taxes. You file your state return using Form 2, the Montana Individual Income Tax Return, which you submit to the Montana Department of Revenue. If you work in Montana or live there, you almost certainly owe state tax unless your income falls below the filing threshold for your filing status.

Key Takeaways

  • Montana's state income tax rates range from 1% to 6.9% across seven tax brackets, and apply to wages, self-employment income, interest, and dividends.
  • You must file a Montana return if you earn income in the state or live there, even if you owe no tax, if your income exceeds the threshold for your filing status.
  • Montana allows a standard deduction that reduces your taxable income, and the amount depends on your age and filing status.
  • If you work in Montana but live in another state, you may owe tax to both states, though Montana offers a credit for taxes paid to other states.

Montana's tax brackets and rates

Montana uses a progressive tax system with seven tax brackets. Your rate depends on your taxable income after deductions. The lowest bracket starts at 1% and the highest reaches 6.9%. The exact income ranges for each bracket change each year to account for inflation, so the thresholds you see this year will differ slightly next year.

To find your bracket, you start with your gross income, subtract the standard deduction (or itemized deductions if you choose that route), and then apply the rate for the bracket your remaining income falls into. Montana's top rate of 6.9% applies only to income above a certain threshold—most workers pay a lower percentage. The state publishes updated bracket tables each January on the Montana Department of Revenue website.

Standard deduction and filing thresholds

Montana allows a standard deduction that reduces the income you actually pay tax on. For the 2024 tax year, the standard deduction varies by filing status: single filers, heads of household, and married filing separately each have different amounts. If you are 65 or older, you receive an additional deduction on top of the standard amount.

You must file a Montana return if your income exceeds the filing threshold for your status. The threshold is usually equal to the standard deduction for your filing status, but it can vary. If your income falls below the threshold, you do not have to file, though filing anyway may result in a refund if taxes were withheld from your paychecks. The Montana Department of Revenue publishes the current year's thresholds in their tax forms and instructions.

What income Montana taxes

Montana taxes wages and salaries, self-employment income, interest, dividends, capital gains, rental income, and retirement distributions. If you receive a W-2 from an employer, that income is taxable. If you run a business as a sole proprietor or partner, your net business income is taxable. Distributions from IRAs, 401(k)s, and pensions are also subject to Montana tax.

Some types of income receive preferential treatment. Long-term capital gains (profits from selling assets held more than one year) are taxed at a lower rate than ordinary income in some cases. Social Security benefits are generally not taxed by Montana, though the state follows federal rules on whether they are taxable based on your other income. Certain retirement income and military pensions may also have partial or full exemptions depending on your age and when you earned the income.

Who has to file in Montana

You must file a Montana return if you live in the state and your income exceeds the filing threshold, or if you work in Montana even if you live elsewhere. Montana taxes residents on all income from any source, and it taxes nonresidents only on income earned within the state. If you moved to or from Montana during the year, you file as a resident for the months you lived there and as a nonresident for the months you did not.

Even if you do not owe tax, you should file if you had taxes withheld from your paychecks or made estimated tax payments. Filing allows you to claim a refund of the overpayment. If you are self-employed, you must file if your net self-employment income is $400 or more, regardless of whether Montana tax is owed, because you also owe federal self-employment tax.

Credits and deductions that reduce your Montana tax

Montana offers several tax credits that directly reduce the tax you owe. The Earned Income Tax Credit (EITC) is available to low- and moderate-income workers and families, and Montana's version is based on the federal credit. The state also offers credits for property taxes paid, dependent care expenses, and contributions to certain retirement accounts. Some credits are refundable, meaning you receive money back even if you owe no tax; others reduce your tax to zero but do not produce a refund.

In addition to credits, you can deduct certain expenses from your income before calculating tax. The standard deduction is the most common route. If you itemize instead, you can deduct mortgage interest, charitable donations, and state and local taxes (subject to federal limits). Montana also allows deductions for contributions to traditional IRAs and some other retirement savings vehicles. The deductions you can claim depend on your income level and filing status, so review the Montana tax forms or consult a tax preparer to determine which ones apply to you.

Montana tax filing deadlines and payment

Montana's tax return is due on April 15 of the year following the tax year, the same date as federal returns. If April 15 falls on a weekend or holiday, the deadline moves to the next business day. You can request an automatic extension to October 15 by filing Form 4868 with the IRS; Montana honors the federal extension, so you do not need to file a separate state extension request.

If you owe tax, you can pay when you file or set up a payment plan with the Montana Department of Revenue. Payments can be made online through the department's website, by mail, or through an authorized payment processor. If you underpaid during the year and owe a large amount, the state may charge interest and penalties on the late payment, so paying as soon as possible after filing reduces those charges.

Frequently Asked Questions

Do I owe Montana tax if I work in Montana but live in another state?

Yes, you owe Montana tax on income you earn in the state. You file a Montana nonresident return reporting only the income earned there. You also file a return in your home state on all your income. Most states offer a credit for taxes paid to other states to prevent double taxation, so check your home state's rules to see if you can claim a credit for Montana taxes paid.

Is Social Security taxed in Montana?

Montana generally does not tax Social Security benefits. However, if your total income (including half your Social Security) exceeds certain thresholds, a portion of your benefits may become taxable under federal rules. Montana follows the federal treatment, so if your benefits are taxable federally, they are also taxable in Montana. Review the instructions for Form 2 to determine if any of your benefits are taxable.

What happens if I do not file a Montana return?

If you owe tax and do not file, the Montana Department of Revenue may assess a penalty and interest on the unpaid amount. The state can also place a lien on your property or garnish your wages to collect. If you do not owe tax but had taxes withheld, you forfeit your refund if you do not file within the time limit (usually three years). Filing even late is better than not filing at all.

Can I file my Montana return electronically?

Yes, Montana accepts electronic filing through approved tax software and tax professionals. E-filing is faster than mailing a paper return and produces a confirmation of receipt. You can e-file through the IRS Free File program if your income is below a certain threshold, or through commercial tax software. The Montana Department of Revenue website lists approved e-file providers.

What is Montana's tax rate compared to other states?

Montana's top rate of 6.9% is moderate compared to other states. Some states have no income tax, while others charge rates above 10%. Montana's progressive structure means most workers pay less than the top rate. The actual tax you pay depends on your income bracket, deductions, and credits, so comparing only the top rate does not show what you will owe.