Montana calls it 'dissolution of marriage' rather than divorce, and its property rules are unusual among states — preparing well here means understanding how broadly a Montana court can look at what gets divided.
Montana is an equitable apportionment state, but with a twist that surprises many people: unlike most equitable-distribution states, Montana law does not automatically wall off separate property (assets owned before the marriage, inheritances, gifts) from division. A court can consider all property owned by either spouse, however and whenever acquired, and apportion it equitably between them. In practice, courts still weigh the source of an asset heavily — property one spouse brought into the marriage or inherited individually is less likely to be split evenly than property built together — but it is not off the table by default the way it is in many other states. That makes the story you can tell about an asset's origin, and the paper trail behind it, genuinely important in Montana.
Dissolution petitions are filed in the District Court for the county where you or your spouse lives, since Montana does not have separate family courts. There is a residency requirement — generally you or your spouse must have lived in Montana for 90 days before filing. Montana is a no-fault state: the standard ground is that the marriage is 'irretrievably broken,' which can be shown by the parties living apart or by serious marital discord that a judge finds has undermined the marriage. Once a petition is filed and served, Montana law sets a mandatory 21-day waiting period before a decree of dissolution can be entered — a shorter wait than many states, but it still shapes how quickly even an agreed case can conclude.
Because Montana courts can look at property regardless of when or how it was acquired, documentation of an asset's origin matters more here than in states with a hard separate-property line. If you owned a house, retirement account, or business before the marriage, or received an inheritance or gift during it, gather the records that show that history: purchase documents, account statements from around the date of the marriage, inheritance or estate paperwork, and anything showing how the asset was (or wasn't) mixed with marital funds over time.
Beyond that, the general disclosure list applies: recent tax returns, pay statements, statements for every bank, investment, and retirement account, mortgage and property tax records, vehicle titles, and debt statements. If either spouse is self-employed or owns a business, business financials and tax filings will matter for both property division and any support calculation.
From the first letter you receive — whether from your spouse's attorney, a mediator, or the court — keep everything. In a case where the property pool can be argued to be broader than usual, the letters documenting who claimed what, and when, often become the reference point once negotiations get specific.
Montana uses 'parenting plans' rather than custody orders, and courts decide them based on the best interests of the child — factors like the child's relationship with each parent, adjustment to home and school, and each parent's willingness to support the other's relationship with the child. Montana courts and many local rules encourage parents to reach a parenting plan by agreement or mediation before a judge imposes one.
Child support follows the Montana Child Support Guidelines, which are calculated from both parents' incomes and the parenting schedule. As with most states, the guideline amount is a starting point that can be adjusted for specific circumstances a judge finds relevant.
1) Pull together the origin story for any asset you consider 'yours alone' — purchase records, pre-marriage statements, inheritance documents — since Montana's broader view of divisible property makes this evidence carry real weight. 2) Confirm your residency timeline meets the 90-day threshold before you plan a filing date. 3) Get at least one consultation with a Montana family law attorney, even if you intend to negotiate directly, so you understand how apportionment is likely to treat your specific property. 4) Build your full disclosure binder early, since Montana's District Courts still expect thorough financial disclosure even without a statewide standardized affidavit. 5) Track the 21-day clock once you file or are served — it's short enough that missing a step can cost real time, and long enough that it's worth planning around.
Not necessarily. Montana courts can consider all property owned by either spouse, including what was owned before the marriage or received as a gift or inheritance, and apportion it equitably. Courts generally still weigh an asset's source heavily, so documenting where property came from matters.
Montana generally requires 21 days from filing and service before a court can enter a decree of dissolution. This is shorter than many states, but it still affects how quickly a case — even an uncontested one — can be finalized.
Generally yes — Montana law requires that you or your spouse have lived in the state for 90 days before filing a dissolution petition. Confirm your specific situation with a Montana attorney or the District Court clerk in your county.
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This guide is general information, not legal advice. Laws change and differ by jurisdiction — confirm specifics with a local family lawyer or your court's official website. If you use SortMyDivorce, your letters stay confidential — never shared, never sold.