Moving to Montana: residency checklist

Your domicile is the place you treat as your permanent home, so the new home has to be the one you really live in. States compare your homes: California's FTB lists the location of your principal residence as a factor, New York's Tax Department reviews the homes you keep and how you use each, and Utah's code compares the living accommodations you have in each state.

Keep as proof: Signed lease or deed, move-in date, and a first utility bill at the new address

File IRS Form 8822 for your home mailing address (the form's instructions say a change generally takes 4 to 6 weeks). USPS says mailers such as banks and government agencies do not forward sensitive mail like driver's licenses, voter registration, credit cards, bank statements or insurance papers, so change your address with each sender directly. Utah's code counts the address you list on mail and tax returns.

Keep as proof: Copy of Form 8822 with proof of mailing, plus address-change confirmations from your bank and insurers

California's FTB lists the state where you are registered to vote as a residency factor, and New York's guidelines look at where you are registered and whether you vote there, including in primary and local elections. The federal National Mail Voter Registration Form can report a change of address and asks for the address where you were registered before; follow your own state's instructions on it, because each state runs registration differently.

Keep as proof: Voter registration confirmation (card or online confirmation page)

Applies if you have children

States look at where your family lives. California's FTB lists the location of your spouse/RDP and children, New York's Tax Department says where minor children attend school can be one of the most important factors, and Utah's code counts where a dependent is enrolled in school.

Keep as proof: School enrollment confirmation and the first report card or school record showing the new address

California's FTB lists where your banks are and where your doctors, dentists, accountants and attorneys are. Not every state weighs these: Minnesota's statute says the Commissioner and courts may not consider where your attorney, CPA or financial adviser is or where you open accounts, and New York's guidelines call the mere location of bank accounts a non-factor. Treat this as supporting evidence, not proof on its own.

Keep as proof: New-patient and account-opening confirmations showing the new address

New York's guidelines list legal documents that name a place as your domicile or primary residence, such as a will, as a factor (a secondary one), and Utah's code counts asserting residency in a document you file with a court or government body. Ask your attorney to review your will, trust and powers of attorney so they match your move.

Keep as proof: Signed copies of the updated documents

iReside logs where you are every day, so you have auditable proof of the day you moved and of the days you spend in your old state. Day counts matter: Minnesota's statute requires adequate records of days spent outside the state, and New York's guidelines treat a diary or calendar as support for where you spent your time. Keep the record for as many years as your old state can still check.

Keep as proof: iReside day report for the year

Deadline: Resident at least 30 days before the election you want to vote in

Montana's registration application asks if you will be a Montana resident for at least 30 days before the next election. If you do not yet meet the residence requirement but will by Election Day, state law lets you apply and be registered subject to verification, but you cannot cast a ballot until you qualify. Montana lists being registered to vote in Montana as a residency factor.

Keep as proof: Voter registration confirmation

Applies if you drive

Deadline: After more than 60 consecutive days of residence (30 days for a CDL)

A person who has resided in Montana for more than 60 consecutive days is a resident for licensing and must hold a Montana license before operating a motor vehicle. For a commercial license the threshold is more than 30 consecutive days.

Keep as proof: Copy of the Montana license

Applies if you own a vehicle

Deadline: Before operating in Montana after 60 consecutive days of residence

A person who has resided in Montana for more than 60 consecutive days is a resident for vehicle laws, and a vehicle they own must be titled and registered in Montana before it is operated in the state after the 60-day period. A Montana resident may not operate a vehicle with another state's plates.

Keep as proof: Montana title and registration

Montana says residency turns on domicile or a permanent place of abode, weighed by factors including a Montana driver's license or ID, voter registration, resident hunting or fishing licenses, where you register vehicles, where you own or occupy a home or RV, where you receive mail, where your business is, and where you get professional, financial and healthcare services. If you keep a home in two states, the department may ask whether you abandoned the other state through affirmative actions.

Keep as proof: Dated documents for each factor you move to Montana

Applies if you own a home

Deadline: Apply between December 1 and March 1 (postmarked by March 1)

Owners of a principal residence apply to the Department of Revenue for the homestead reduced tax rate, online or by mail. Qualifying means you live in the property at least 7 months of the year and are current on property tax. Applications after March 1 apply to the following tax year. The enrollment period for tax year 2027 runs May 4, 2026 to March 1, 2027.

Keep as proof: Enrollment confirmation

Deadline: With your Montana return for the year you moved

If you were a nonresident at the start of the year and established Montana residency during the year, you are a part-year resident. File as a part-year resident and use the Nonresident/Part-Year Resident Schedule. Montana taxes income you receive while living in Montana plus Montana-source income received when not living here.

Keep as proof: Copy of the filed return and move date

A home you keep is the first thing a state looks at. New York's guidelines weigh whether you made real efforts to sell it (for example by hiring a real estate firm) and moved your belongings out, and California's FTB lists the location of your principal residence. If you keep the old home, the old state may compare it with your new one, and keep a day log.

Keep as proof: Listing agreement, closing statement, lease termination or new rental lease for the old home

New York's guidelines treat the location of items you hold near and dear (family heirlooms, art, collections, photo albums, pets) as a primary factor, and note that a mover's bill of lading or an insurance statement can document the move. Items left behind in the old state can suggest you have not given it up.

Keep as proof: Mover's bill of lading or inventory, and an insurance policy showing the new address

File a permanent change of address at the Official USPS Change of Address site (identity verification required) or at a Post Office. USPS says to allow at least 7 to 10 business days after approval for it to start, so file before moving day.

Keep as proof: USPS confirmation email

Applies if you are a registered voter

California's FTB lists where you are registered to vote as a residency factor, New York's guidelines look at where you are registered and how you voted, and Utah's code treats voting in the state, without being registered in another state, as establishing domicile there. Register in your new state (the federal form asks for your previous registration address), then stop voting from the old one and ask your old election office how to cancel.

Keep as proof: Confirmation that the old registration was cancelled or moved

California's FTB lists where your social ties are, such as your place of worship, professional associations and clubs, and Utah's code counts membership in a church, club or similar group in the state. Resign, transfer or switch to non-resident status where you can, and join local groups in your new state.

Keep as proof: Resignation or transfer letters and new membership confirmations

Keep iReside running through the move year and after: it logs where you are every day, so you have auditable proof of when you left and of any days you spend back in the old state. Minnesota's statute requires adequate records of days spent outside the state, and New York's guidelines treat a diary or calendar as support for where you spent your time. Keep the record for the years your old state can still check.

Keep as proof: iReside day report for the year

If you keep a place of abode in Montana and another state with similar permanence, the department may look at whether you abandoned Montana through affirmative actions. Its list of factors includes the Montana license or ID, voter registration, vehicle registration, where you get mail, professional licenses, healthcare and financial services, and clubs or places of worship. Move each one.

Keep as proof: New-state license, registration, voter confirmation and mail address records

Deadline: With your Montana return for the year you left

If you were a Montana resident at the start of the year and established residency in another state during the year, you are a part-year resident. Montana taxes the income you received while living here plus Montana-source income after you leave. Use the Nonresident/Part-Year Resident Schedule.

Keep as proof: Copy of the filed return

Applies if you own a home

Deadline: Ends with the tax year you stop using it as a principal residence

The homestead reduced rate stays effective until the end of the tax year in which ownership changes, you no longer use the dwelling as a principal residence, or you apply for a different principal residence. Remaining taxes for that year are then based on the rate in effect on January 1 of that year.

Keep as proof: Enrollment confirmation and the date you moved out

Montana says retirees who are residents but live in another state for part of each year (snowbirds) are not part-year residents. A person is not a part-year resident unless they actually established residency in another state during the year.

Keep as proof: Records showing the year you established residency elsewhere