Preparing for Divorce in Montana

Preparing for a divorce in Montana comes down to four things: understanding what a court actually decides, gathering your financial records, choosing how you want to resolve the case, and avoiding a short list of mistakes that make everything harder. None of it requires you to file first, and none of it commits you to anything. This page is the starting point for the Preparing and Costs section of our Montana Divorce Guide.

Know What a Montana Divorce Decides

Montana calls a divorce a dissolution of marriage. Before a court enters a decree, it must have considered, approved, or provided for four subjects, to the extent it has jurisdiction over them (MCA § 40-4-104(1)(c)).

Knowing the list helps you sort your own situation. A couple with no minor children has two issues, not four. A couple who agrees about parenting but not about the house has one real dispute. Our overview of how divorce works in Montana explains the grounds and the residency rule, and Montana divorce myths corrects the assumptions people most often bring with them.

Gather Your Financial Information

Financial disclosure is not optional in Montana. Within 60 days after the petition is served, each spouse must serve a preliminary declaration of disclosure, signed under penalty of perjury, that identifies all assets and liabilities, along with an income and expense declaration (MCA § 40-4-252). A final declaration follows before settlement or trial (MCA § 40-4-253).

You will fill those out more accurately, and with less stress, if you have already collected tax returns, pay records, account statements, retirement statements, deeds, loan statements, and insurance policies. Our divorce documents checklist lists what to collect and why. Gather only records you have a lawful right to see. Do not open mail addressed only to your spouse or log in to accounts that are not yours.

Think About Your Children First

If you have minor children, the petition must include a proposed parenting plan (MCA § 40-4-105(1)(f)). Before you draft anything, write down how your children's weeks actually work now: school, activities, medical care, and who handles what. Courts decide parenting according to the best interest of the child (MCA § 40-4-212(1)), and one stated objective of a final plan is to minimize the child's exposure to parental conflict (MCA § 40-4-233(3)).

How and when you tell them matters too. See telling your children about divorce, and our overview of parenting plans in Montana.

Choose How You Want to Resolve It

Filing a petition does not mean going to trial. Spouses may settle every issue in a written separation agreement, and the property and maintenance terms of that agreement bind the court unless it finds them unconscionable (MCA § 40-4-201). You can reach that agreement on your own, with a mediator, with lawyers negotiating, or through a cooperative process. If you cannot agree, a judge decides.

A&M Law offers Cooperative Family Law, in which the firm serves as a neutral for both spouses, who meet together. The firm represents the process rather than either spouse, and each spouse remains free to consult their own lawyer. The firm also represents individual clients in traditional divorce cases. For a comparison of the routes, see contested versus uncontested divorce. The route you choose is also the largest factor in what a divorce costs.

Understand the Timing Rules

One spouse must have been domiciled in Montana, or stationed here in the armed services, for 90 days before filing (MCA § 40-4-104(1)(a)). A decree may not be entered until 21 days after the date of service (MCA § 40-4-105(3)). Beyond those rules, timing is a personal decision with some legal and financial edges, which we cover in when is the right time to file.

Whether to leave the family home before or during the case is a related question. Moving out does not give up your interest in the property, but it can affect day-to-day parenting arrangements. See should I move out of the house.

Know What Not to Do

When a petition is filed, the clerk issues an automatic economic restraining order with the summons. It restrains both spouses from transferring, encumbering, concealing, or disposing of marital property without the other's written consent or a court order, with exceptions for ordinary living expenses, the usual course of an existing business, and reasonable professional fees (MCA § 40-4-126(1)). It also bars canceling joint credit cards, changing beneficiaries, and letting insurance lapse.

• Do not hide, move, or spend down assets. The court considers dissipation of value when it divides property (MCA § 40-4-202(1)). See protecting your finances lawfully.
• Do not put children in the middle. See what not to do during a divorce.
• Do not post, text, or delete in anger. See social media and texting during divorce.
• Do not secretly record conversations. Montana makes it an offense to record a conversation with a hidden device without the knowledge of all parties (MCA § 45-8-213(1)(c)).

Look After Yourself, and Stay Safe

Divorce is hard on people, and getting support is part of preparing. Our page on divorce and your mental health explains how counseling records are treated. It is also fine to slow down. If you and your spouse want to try again after a case has started, Montana law lets you pause or dismiss it, as explained in reconciliation and dismissing a divorce.

Safety changes the order of everything on this page. If you are in danger, call 911. The National Domestic Violence Hotline is 1-800-799-7233. Our Montana Domestic Violence Guide and our page on divorce and domestic violence explain the protective orders available.

This page explains Montana law in general as of the 2025 Montana Code Annotated. It is not legal advice about your specific situation.