Moving from Canada to Montana: State Tax, No Sales Tax, and the Border Corridor

Montana sits directly south of the Alberta and BC border, close enough that Calgary and Lethbridge residents already treat it as a weekend drive for skiing or Glacier National Park. For anyone actually relocating, the appeal holds up under closer scrutiny: a flat 5.9% state income tax (down from a graduated system that topped out at 6.75% before Montana’s 2024 reform), no sales tax at all, and no local income taxes layered on top. That’s a rare combination among US states, and it’s a real reduction from most Canadian provincial rates. The federal cross-border rules, departure tax, RRSP treatment, and reporting obligations still apply exactly as they would for a move to any other state.

How does Montana’s flat tax compare to Alberta and BC?

Montana’s 5.9% flat rate applies to all taxable income above a small standard deduction, with no brackets to climb through. Here’s how that lines up against the provincial rates on the Canadian side of this corridor:

Province	Top marginal provincial rate	Income where it kicks in
Alberta	15%	$355,845+
BC	20.5%	$252,752+
Saskatchewan	14.5%	$154,244+
Montana	5.9% (flat)	All taxable income

Even against Alberta, which has the lowest top provincial rate in Canada, Montana’s flat 5.9% is well under half. On $150,000 of employment income, Alberta’s provincial tax would run somewhere in the $14,000 to $16,000 range, while Montana’s flat rate produces roughly $8,800 (after the standard deduction). The federal US and Canadian rates are a separate comparison, but the provincial-to-state layer is where this move shows up fastest on a pay stub.

What’s the real value of Montana having no sales tax?

Montana is one of only five states with no state sales tax, alongside Oregon, Delaware, New Hampshire, and Alaska. There’s no state sales tax, no general local sales tax, and no HST-equivalent layered on purchases. For someone coming from Alberta (5% GST only) this is a modest change. Coming from BC, Saskatchewan, or anywhere with a provincial sales tax or HST, it’s a bigger one: every retail purchase, vehicle, appliance, and piece of furniture costs exactly the sticker price, with no tax added at the register.

There’s one wrinkle worth knowing about before you assume Montana is tax-free at checkout everywhere. A handful of resort communities, including Big Sky, Whitefish, Red Lodge, Virginia City, and West Yellowstone, are permitted to impose a local resort tax (commonly around 3%) on luxury goods, lodging, restaurants, and similar discretionary spending. It only applies within those specific towns and only on the categories the local ordinance covers, so it’s not a statewide sales tax by another name. If you’re settling in Whitefish or Big Sky specifically, budget for it; everywhere else in the state, it doesn’t exist.

How does Montana treat the RRSP?

Montana starts its income tax calculation from federal adjusted gross income, so items that are excluded federally generally stay excluded at the state level too. Because the RRSP treaty deferral under Article XVIII keeps the plan’s internal growth out of federal AGI, Montana doesn’t add it back separately. In practice, the RRSP is deferred at both the federal and state level while it stays invested.

When you eventually take an RRSP withdrawal, it’s included in federal AGI and flows through to Montana’s return at the flat 5.9% rate. That’s a simpler outcome than states that decouple from federal treatment and tax RRSP growth annually. The TFSA doesn’t get the same courtesy: it’s a foreign trust for US purposes regardless of state, which means Form 3520/3520-A reporting and PFIC exposure on the investments inside. The standard recommendation, collapsing the TFSA before departure, holds here the same as anywhere else.

What happens on the Canadian side when I leave?

The Montana move doesn’t change anything about the Canadian exit itself. The standard departure sequence applies:

• Deemed disposition of worldwide assets at fair market value on the date of departure, with exceptions for Canadian real property, pension plans, and certain other excluded property
• A final Canadian return covering January 1 through the departure date, reporting all income and gains up to that point
• Provincial tax at the rate of whichever province you’re leaving, calculated on your income and departure-year gains
• T1161 and T1243 if the fair market value of property owned at departure exceeds $25,000
• A decision on the RRSP (generally left in place, with the treaty deferral applying) and the TFSA (generally collapsed before departure)
• Updating the CRA on your new non-resident status and mailing address

None of this is smaller or larger because Montana happens to be a low-tax destination. The departure filing obligations are set by what you’re leaving, not what you’re moving to.

What about Montana’s other taxes?

Beyond the flat income tax and the absence of sales tax:

Property tax. Montana’s effective property tax rates run roughly 0.7% to 0.9% of market value, which is moderate by US standards and generally comparable to or below what Albertans pay in municipal property tax. Montana uses a classification system that taxes different types of property (residential, commercial, agricultural, and so on) at different percentages of market value, so the exact bill depends on the class and the local mill levy, not just the sale price.

Estate and inheritance tax. Montana has neither a state estate tax nor an inheritance tax. The only exposure is the federal estate tax, which applies above $13.61 million for US citizens and residents, or the much lower $60,000 threshold for non-citizens without treaty relief.

Retirement income. Montana offers a pension and annuity income exclusion of up to $5,500 for taxpayers with federal AGI under $45,060 (single) or $36,010 (married filing separately), phased out above those thresholds. Social Security follows the federal treatment; Montana doesn’t add a separate state tax on top of whatever portion is federally taxable.

How does Montana compare to Idaho, Wyoming, and Washington?

Montana sits in a cluster of nearby states that each handle this differently, which matters if you’re choosing between them rather than defaulting to Montana specifically.

• Idaho has a flat income tax at 5.695% (2025) and does charge state sales tax (6%), so the Idaho corridor trades a slightly lower income tax rate for a sales tax Montana doesn’t have.
• Wyoming has no state income tax at all, which beats Montana on the income side, but it’s a smaller, less accessible market for most Canadian remote workers and doesn’t have Montana’s university towns or comparable outdoor-recreation infrastructure at Bozeman or Missoula’s scale.
• Washington has no state income tax on wages but does tax capital gains above $270,000 at 7% and charges a real sales tax (6.5% state plus local additions), which the BC-to-Washington corridor covers in detail. It’s a very different tradeoff than Montana’s flat-and-simple approach.

Montana’s pitch isn’t the single lowest number on any one tax. It’s that the combination, flat 5.9% income tax with no sales tax and no local income tax, is unusually simple and unusually light across the board.

What should I do next?

The Canadian exit follows the standard checklist regardless of Montana’s favorable state-level picture. On the Montana side, the main planning items are the part-year return split, the RRSP/TFSA decisions before you leave, and the first US filing year.

• Departure tax checklist, the full Canadian exit sequence
• US-Canada tax treaty explained, how Article XVIII protects the RRSP
• RRSP and TFSA on a US move, federal treatment and reporting
• First US tax return after moving from Canada, the arrival-year mechanics
• State income tax for cross-border filers, comparing Montana to other states
• Departure tax forms T1161 and T1243, the property-reporting mechanics
• Moving from Alberta to Texas, another low-provincial-tax departure point compared against a no-income-tax state
• Moving from Canada to Idaho, the neighboring flat-rate state with sales tax
• Moving from Canada to Oregon, another no-sales-tax state for comparison
• Moving from BC to California, a higher-tax contrast for BC-based movers weighing options
• Moving from Canada to North Dakota, the neighboring near-zero income tax state
• Moving from Canada to Wyoming, the neighboring no-income-tax state

This guide is general information, not tax advice for your specific situation. Which points apply, and how, depends on your facts.