Moving to Montana

Montana taxes a resident on all income from everywhere, and a nonresident on Montana-source income only. A part-year resident is taxed on everything received while living in Montana plus any Montana-source income from the rest of the year. The mechanism is the same for both: Form 2 figures the tax as if the filer were a full-year resident, then Schedule II multiplies it by the share of total income that is Montana’s. Residency itself turns on domicile and a permanent place of abode, judged from a list of ordinary-life facts, with no published day count. Montana has one reciprocity agreement, with North Dakota, covering wages only. Residents who pay tax to another state get a credit, capped at the Montana tax on the same income, with one modern exception: income earned while working remotely from Montana that another state taxes under a convenience-of-the-employer rule earns no credit, because Montana regards that income as its own.

Who is a Montana resident

The Department of Revenue’s definition is short: a resident is a person who is domiciled in Montana or who maintains a permanent place of abode in Montana. Domicile is the place you intend to return to and treat as home; a permanent place of abode is a dwelling kept for your use the year round. The Department does not publish a 183-day test or any other day count on its residency page (verify). Instead it lists the facts it weighs:

• Montana driver’s license or ID card, and voter registration
• Montana resident hunting or fishing license, or a concealed-weapon permit
• Claiming Montana residency for college admission, tuition or financial aid, or on another tax return
• Where vehicles are registered, where property is owned or occupied, and where mail is received
• The location of your principal business, profession or professional licenses
• Where you regularly see doctors, bankers and other professionals
• Place of worship, and social, fraternal, athletic and club memberships

No single fact decides it, and the list is not complete. When a person keeps homes of similar permanence in Montana and another state, the Department looks for the affirmative steps that show one residency was abandoned for the other. In practice, the resident hunting and fishing license is the fact that trips people most often: Montana sells those only to residents, and a part-time resident who buys one has told the Department something.

Nonresident active-duty service members stationed in Montana do not become residents by being here, and may hold Montana hunting, fishing and driver’s licenses without becoming tax residents. Their nonmilitary spouses generally pay tax only to their home state under the Military Spouses Residency Relief Act, and Form MW-4 carries a box to stop Montana withholding on the spouse’s wages.

The part-year and nonresident return

Everyone files the same Form 2, marking the residency status at the top. A part-year resident or nonresident then completes Schedule II, the Nonresident/Part-Year Resident Schedule. The approach is to compute Montana taxable income and tax exactly as a resident would, from federal taxable income with the Schedule I adjustments, and then to multiply the tax by the ratio of Montana-source income to total income. Because long-term capital gains have their own rates, the schedule works a separate ratio for them (verify). The result is that a part-year resident pays Montana rates on the Montana share, and the federal deductions are shared in proportion rather than allocated by date.

What counts as Montana-source income for the non-resident part of the year is income from Montana work, Montana property and Montana businesses: wages for services performed in Montana, rent from Montana real estate, gain on the sale of Montana real estate, and the Montana share of a partnership or S corporation. Interest, dividends and pension income received while a nonresident are not Montana-source and are left out. Income received while a resident is all Montana income, whatever its source, and a credit is available for tax another state charges on that same income.

A married couple where one spouse is a resident and the other is not may file a joint “mixed residency” return, a box added to Form 2 in 2025. It lets the couple keep the joint federal filing status and apportion through Schedule II rather than filing separately.

North Dakota reciprocity

Montana’s only reciprocal agreement is with North Dakota, and it covers wages. A North Dakota resident who works in Montana pays North Dakota, not Montana, on those wages, and a Montana resident who works in North Dakota pays Montana only. The exemption is claimed on Form MW-4 given to the Montana employer, which replaced the old Form MT-R; the employer files the MW-4 with the Department. If Montana tax was withheld anyway, the North Dakota resident recovers it by filing Form 2 marked as a nonresident with the reciprocity box checked and the W-2s attached. The agreement does not reach rental income, business income or gain on Montana property, which a North Dakota resident still reports to Montana.

Residents of every other state who work in Montana owe Montana tax on those wages and file as nonresidents. They then claim a credit in their home state, under that state’s rules, for the Montana tax.

The 30-day rule

A nonresident who worked in Montana for 30 days or fewer during the year, and also worked in at least one other state, owes no Montana tax on those wages and need not file. The rule is for the traveling employee, not for everyone who passes through. It does not apply to professional athletes, entertainers, per-event workers, construction workers, employees earning over $500,000, or production employees under the state’s media credit, and it does not apply to the self-employed, to a person who worked only in Montana, or to a person with other Montana-source income such as a rental. If the employer withheld Montana tax on a qualifying short stint, the employee files a nonresident Form 2 to get it back.

The credit for tax paid to another state

A Montana resident or part-year resident who paid income tax to another state or country on income from sources there, while a Montana resident, claims a nonrefundable credit on Schedule III. The credit cannot exceed the Montana tax on that same income, and an unused credit does not carry over. Four things do not qualify: local income taxes, such as a city tax; tax to a state that gives Montana residents a credit for Montana tax on the same income instead; foreign taxes to the extent the federal foreign tax credit was taken; and tax another state charges on work done from Montana.

That last one is the remote-work trap. Montana sources wages to where the work is physically performed and has no convenience-of-the-employer rule of its own. A Montana resident who works from a home office in Montana for an employer in a state that does have such a rule may find both states taxing the same wages, and the Department will not give a credit for the other state’s tax because, in Montana’s view, the income was earned in Montana. The practical remedies are in the other state: filing there as a nonresident with the work days documented, or qualifying for whatever exception that state allows. The employer’s payroll setup matters too; Montana withholding is owed on wages for work done in Montana regardless of where the employer sits.

The reverse case is simpler. A Montana resident who commutes to work in another state, or who travels there for a project, pays that state as a nonresident and takes the Montana credit, limited to Montana’s tax on those wages. Because Montana’s top rate is 5.65%, the credit usually absorbs all of the Montana tax on wages taxed by a state with higher rates and only part of it for a state with lower rates.

Retirement income and the move

Federal law bars any state from taxing the retirement income of a person who no longer lives there. So a pension earned over a career in another state becomes Montana income on the day its recipient becomes a Montana resident, and Montana taxes it, at 4.7% and 5.65%, to the federal extent. A Montana resident who retires elsewhere stops owing Montana on the pension from the move date; Montana may still tax Montana-source items such as a rental left behind. For the move year the pension is apportioned through Schedule II with the rest of the income. Montana for retirees has the detail on what Montana does with retirement income once you are here.

The year you move: a checklist