Tax residency rules, audits, and the severance record (2026)
2026.1 Edition · Revised 2026-07-25 · DomusDay Research
Moving out of Montana is easy. Stopping Montana taxes is a different act, and it happens on paper: Montana keeps treating you as a resident until the record shows otherwise.
On the burden of showing otherwise: Residency in one state is not abandoned until the union of act and intent demonstrates residency established in another, and the individual is expected to support each response with contemporaneously kept records — unsupported, vague, or absent answers do not count in their favour.
There is no day-count to get under. Montana has no day-count residency test. An individual may be a resident where they are domiciled in the state or maintain a permanent place of abode in the state, and the question is decided in light of all facts and circumstances for the tax year. There is no threshold to fall under — the record of act and intent is the whole case. That makes the evidence trail — where the pattern of an actual life points — the entire case. Everything on this page exists to answer one question: if DOR asks, does your record hold?
Montana's residency rule states that residency in one state is not abandoned until it can be demonstrated by the union of act and intent that residency has been established in another state. Intent is read from objective factors in conduct and declarations, not from stated plans.
Source ↗The rule expects an individual to support residency responses with contemporaneously kept records, and states that an item with an unsupported, vague, or non-response will not be considered as supporting that individual's position on their state of residence.
Source ↗Montana taxes net long-term capital gains on a separate schedule from ordinary income. HB 337 keeps the 3.0% and 4.1% rates while realigning the brackets to the new ordinary-income ranges for 2026 and 2027.
Source ↗The Homestead Reduced Rate is a property tax classification claimed through the Department of Revenue for a home occupied as a principal residence at least seven months a year. The Declaration of Homestead is a separate recorded instrument addressing creditor claims, and it confers no tax benefit.
Source ↗Montana has no day-count residency test. An individual may be a resident where they are domiciled in the state or maintain a permanent place of abode in the state, and the question is decided in light of all facts and circumstances for the tax year. There is no threshold to fall under — the record of act and intent is the whole case. Days still matter — not as a threshold to duck under, but as evidence of where the year was actually lived, and as the trigger for the presumptions below.
Selling the apartment is not the test, and neither is the new driver's license. Montana presumes an established domicile continues until it is shown to have changed — residency is determined in light of all facts and circumstances for the tax year, on the basis of domicile or a permanent place of abode maintained in the state. On the burden: Residency in one state is not abandoned until the union of act and intent demonstrates residency established in another, and the individual is expected to support each response with contemporaneously kept records — unsupported, vague, or absent answers do not count in their favour. Examiners weigh 3 primary factors — the union of act and intent, a permanent place of abode maintained in montana, contemporaneously kept records — and they weigh what you did, not what you intended. The pattern of an actual life somewhere else is the evidence; everything else is secondary.
A clean exit does not end every Montana claim. These rules keep taxing specific situations after the move — each one is a way the state stays in your return.
AffectsMovers between homes, those travelling for extended periods, and anyone whose new-state arrangements are provisional.
AffectsAnyone whose residency position rests on recollection rather than dated documents.
AffectsLeavers who keep Montana workdays, ranch or rental property, or a Montana business interest.
AffectsMovers with appreciated assets realizing gains around the residency change.
Montana Department of Revenue (DOR) runs a moderate-intensity residency program. The department publishes no residency audit statistics, but its residency rule is unusually explicit about evidence: contemporaneously kept records are expected, and unsupported or vague responses are not counted as support. An examination is not an argument about intentions — it is a request for documents, and the request looks like this:
Every item on that list either exists in your records from the year of the move, or it does not. That is the whole game — and why the severance record below is the section that matters most.
An audit years from now is answered with documents generated in the months around the move. This is that inventory — grouped the way examiners think about a life, each item paired with the evidence it leaves behind.
Montana's rule puts the burden in an unusual place. There is no day count to manage; instead, residency is not abandoned until the union of act and intent shows residency established in another state — and the record has to be contemporaneous, because the rule states that unsupported, vague, or absent answers do not count as support. The change year is filed on Form 2, where Montana source income is expressed as a ratio against the full-year resident tax. Gains realized around the move meet Montana's separate 3.0% and 4.1% long-term capital gains rates.
Obtaining the destination state's license, with the Montana license surrendered, is a dated declaration of the kind the rule reads as objective evidence of intent.
Source ↗Montana titles and registrations follow residency — new residents have 60 days to title and register — and the same transfer runs in reverse on departure.
Source ↗Montana voter registration requires 30 days of residence in the state and county; registering in the new state supersedes it with a dated record there.
Source ↗Because residency in one state is not abandoned until the union of act and intent establishes it in another, the destination state's deed or lease — and the conduct around it — is the central fact of the departure record.
Source ↗A permanent place of abode maintained in Montana is an independent basis for residency, so what happened to the Montana home — sold, leased, or kept available — is weighed alongside domicile.
Source ↗The Homestead Reduced Rate is an attestation that the property is the owner's principal residence for at least seven months a year and the only claimed homestead; enrollment runs by tax year through the Department of Revenue, so the enrollment record shows which years were claimed.
Source ↗A recorded Declaration of Homestead is signed before a notary and filed with the Clerk and Recorder in the county where the property sits; it addresses creditor claims rather than tax classification, and it stands on the county record until released.
Source ↗Banking and advisory relationships moved to the new state are objective conduct of the sort the rule weighs in reading intent.
Montana workdays after the move keep producing Montana source income, which drives the ratio used to compute nonresident tax on Form 2.
Source ↗Long-term capital gains carry their own 3.0% and 4.1% rates in Montana, so the date a gain is realized relative to the residency change determines which state's treatment applies to it.
Source ↗Physicians, dentists, and advisers engaged in the new state generate dated, located records — contemporaneous by their nature.
Where household goods, vehicles, and livestock or equipment went is objective conduct corroborating the claimed change.
The residency rule expects contemporaneously kept records; a log maintained through the move year — locations, dates, and the documents generated — is what the rule asks for, and reconstruction afterward is expressly discounted.
Source ↗The change year is filed on Montana Form 2 with the applicable schedules: Montana source income is reported, and tax is computed by applying the ratio of Montana source income to total income against the tax determined as if a full-year resident.
Source ↗Every rule on this page traces to one of these. When a blog and a statute disagree, the statute wins — start here.
How these are chosen, what the automated gates catch, and what this site deliberately does not do: how these guides are made →
The year of the move is filed on Form 2, with income split between the resident and nonresident periods — and that return is itself evidence: it states your change date on a signed document. Montana withholding follows Montana source income; because tax is computed on a source-income ratio rather than a separate nonresident schedule, the allocation happens on the return.
Montana publishes no day count. Residency is decided on all facts and circumstances, on the basis of domicile or a permanent place of abode in the state, and the rule states that residency is not abandoned until the union of act and intent shows residency established in another state.
Contemporaneous evidence. The residency rule expects responses to be supported with contemporaneously kept records and states that an unsupported, vague, or non-response will not be considered as supporting the individual's position. Documents created as the move happens carry weight that reconstruction afterward does not.
Net long-term capital gains are taxed on their own schedule at 3.0% and 4.1%, apart from the ordinary rates of 4.7% and 5.65% for 2026. HB 337 keeps those capital gains rates and realigns their brackets to the ordinary-income ranges for 2026 and 2027.
Montana source income, where there is a federal filing requirement. Tax is computed by applying the ratio of Montana source income to income from all sources against the tax determined as if the person were a resident for the entire year, on Form 2 with the applicable schedules.
Both, for different reasons. The Homestead Reduced Rate is claimed through the Department of Revenue by attesting that the home is the owner's principal residence at least seven months a year and the only claimed homestead — an attestation that speaks to where the principal residence is. The recorded Declaration of Homestead, filed with the county Clerk and Recorder, addresses creditor claims and confers no tax benefit.
Title and register vehicles within 60 days of establishing residency, and obtain a Montana driver license. Voter registration requires 30 days of residence in the state and county, with late registration available through election day. Homestead Reduced Rate enrollment runs by tax year, with a March 1, 2027 deadline for 2027.
2026.1 Edition · Revised 2026-07-25 · DomusDay Research