Montana Divorce Guide
How Montana ends a marriage, what a decree decides, how the process runs, and how to prepare. Written by Missoula family law attorneys, with the statute cited for every rule.
Written by
Misty Gaubatz, Partner, A&M Law
Licensed Montana attorney and co-founder of A&M Law. Over two decades in the practice of law focusing on family law, criminal defense, and DUI defense, with federal and state court experience and a Certificate in Mediation.
People look up Montana divorce law at three different moments. Some are deciding whether to file and want to know how it works. Some are in the middle of a case and need to understand one issue: the house, a retirement account, a parenting schedule, child support. And some are working out how to prepare and whether they need a lawyer.
This guide is organized around those three moments. Each article answers one question, cites the section of the Montana Code Annotated or the rule it relies on, and says so when the law does not give a clear answer.
If you already know what you need, our divorce and Cooperative Family Law pages are the faster route. If you would rather talk it through, call 406-830-3060.
Before You File
How Montana ends a marriage, what it takes to start a case, and the different ways to get from petition to decree.
Divorce Basics
How Divorce Works in Montana
What the court must find, the four things a decree settles, and the routes to get there.
Grounds for Divorce in Montana
One no-fault ground: the marriage is irretrievably broken. Where conduct still matters.
The Residency Requirement
The 90-day rule, which county to file in, and the separate test for children.
Do We Have to Be Separated First?
No. The 180 days apart is one of two ways to show the marriage is broken.
Legal Separation vs. Divorce
What a legal separation settles, how it converts after 6 months, and benefit questions.
Summary Dissolution in Montana
The simplified joint procedure: every condition, the hearing, and what you waive.
Filing a Joint Petition
Filing together as co-petitioners, what goes with it, and when a hearing can be skipped.
Annulment vs. Divorce
Declaration of invalidity: the grounds, the deadlines, and why a short marriage is not one.
Common-Law Marriage and Divorce
The four elements courts apply, and why ending one takes a dissolution.
How Long Do You Have to Wait?
The 21 days after service, the other statutory time periods, and what controls timing.
Can My Spouse Refuse a Divorce?
No. What happens if a spouse denies the breakdown, will not sign, or never responds.
Montana Divorce Terms Glossary
Dissolution, parenting plan, maintenance, decree, and more, with statute cites.
Filing & the First Steps
How to File for Divorce in Montana
The steps from petition to decree, with the statute behind each one.
What Goes in a Divorce Petition
The eight items a Montana petition must set forth, and what verified means.
Filing Fees and Fee Waivers
What the clerk of district court charges to file, and how to ask for a waiver.
Serving Divorce Papers
Who may serve the petition, service by mail, proof of service, and the time limit.
If You Cannot Find Your Spouse
Service by publication, the diligent search, and what the decree can and cannot decide.
Responding to a Divorce Petition
The 21-day response, what it does, and what happens if you do nothing.
Default Divorce in Montana
When a spouse does not respond: what the court still must find and how a default is set aside.
Automatic Economic Restraining Order
What both spouses may not do with property and insurance once a case is filed.
Financial Disclosure in Divorce
Preliminary and final declarations of disclosure, deadlines, and penalties.
Temporary Orders During Divorce
Temporary maintenance, child support, family support, and injunctions while a case is pending.
Interim Parenting Plans
How a parenting schedule is set while the case is pending, and why it matters later.
Divorce Without a Lawyer
Court forms, the Court Help Program, and the rules self-represented people are held to.
Ways to Divorce
Contested vs. Uncontested Divorce
The difference is agreement, not paperwork. Every path from petition to decree.
Marital Settlement Agreements
What a separation agreement can cover, how a judge reviews it, and how it is enforced.
Mediation in a Montana Divorce
When a court can order mediation, the abuse exception, confidentiality, and who pays.
The Cooperative Divorce Process
How one neutral firm works with both spouses together, and what the court still requires.
Settlement Conferences & Standing Masters
One helps you settle, the other can decide your case. Deadlines for objecting to a master.
Going to Trial in a Divorce
A judge, not a jury. What the court decides, how evidence works, and what findings say.
Arbitration in Family Cases
Montana's family law arbitration statute and the court review of parenting awards.
Limited Scope Representation
Hiring a lawyer for part of a divorce: drafting, review, or a single hearing.
Agreeing on Everything Before You File
What a complete agreement covers and how it becomes a decree, sometimes without a hearing.
When Agreement Is Not Safe or Possible
Abuse, coercion, or hidden finances: the protections a Montana court can order instead.
Parenting Plan Dispute Resolution Clauses
How a plan can require mediation before court, and the limits where there is abuse.
Can We Use One Lawyer?
Why one lawyer cannot represent both spouses, and how a neutral is different.
The Issues a Divorce Decides
Property and debt, maintenance, parenting, child support, the court process, and what comes after the decree.
Property & Debt
How Property Is Divided
Equitable apportionment under MCA 40-4-202: what is divided, the factors, and why equal is not automatic.
Separate vs. Marital Property
Premarital, gifted, and inherited property is not automatically excluded. What a court must consider.
Who Gets the House?
Sale, buyout, or delayed sale, and why the mortgage and the title are separate questions.
Retirement Accounts & QDROs
How 401(k)s, pensions, and IRAs are divided, and what a QDRO has to say.
Montana Public Pensions
PERS, TRS, and other public pensions need a family law order approved by the board.
Military Pensions & Benefits
Disposable retired pay, the 10/10 rule, the frozen benefit rule, and disability pay limits.
Dividing a Business
Valuation in general terms, who keeps the business, buyouts, and what must be disclosed.
Dividing Debt
The decree decides who pays between spouses. It does not bind your creditors.
Hidden Assets & Dissipation
Sworn disclosure, what a court can do about an undisclosed asset, and wasted marital money.
Farms & Ranches
Inherited and premarital land, valuation, cash-poor estates, and keeping an operation intact.
Pets, Vehicles & Belongings
How vehicles, household goods, and pets are divided, with a practical inventory list.
Prenups in a Divorce
When Montana enforces a premarital agreement, the grounds to challenge one, and its limits.
Maintenance & Money
Spousal Maintenance in Montana
The two threshold findings, the six factors, and why Montana has no alimony formula.
Who Qualifies for Maintenance
The two-part test a spouse must meet before a court can order maintenance.
How Long Maintenance Lasts
No schedule in the statute. How periods are set and when payments end.
Modifying or Ending Maintenance
The unconscionability standard, and why only future payments can change.
Temporary Maintenance During Divorce
Asking for maintenance or family support while the case is pending.
Maintenance and Taxes
Federal tax treatment of maintenance after 2018, child support, and property transfers.
Health Insurance After Divorce
COBRA, Montana conversion rights, marketplace enrollment, and the deadlines for each.
Social Security and Divorce
The 10-year marriage rule for benefits on a former spouse's record.
Attorney Fees in a Montana Divorce
When a court can order one spouse to contribute to the other's fees and costs.
Bankruptcy and Divorce
Which divorce obligations survive bankruptcy, and what the automatic stay pauses.
Life Insurance and Beneficiaries
What you cannot change during the case, and what the decree revokes automatically.
Enforcing a Divorce Decree
Contempt, execution, liens, and withholding when a former spouse ignores the decree.
Parenting Plans
Parenting Plans in Montana
How Montana decides custody: what a parenting plan covers, who decides it, and how it changes.
Best Interest of the Child Factors
All 13 parenting factors in MCA 40-4-212 in plain words, plus the statute's special rules.
Is 50/50 Parenting the Default?
What Montana's statutes say, and do not say, about equal parenting time.
What a Parenting Plan Must Include
The schedule, decision-making, finances, and dispute resolution terms listed in MCA 40-4-234.
Parenting Schedules by Age
Week on/week off, 2-2-3, 5-2-2-5 and other schedules, and the questions to ask at each age.
Does My Child Get to Choose?
A child's wishes are one factor. No age decides it. How Montana judges hear from children.
Guardians ad Litem & Parenting Evaluations
What a GAL does, how court-ordered reports work, who pays, and how a judge uses them.
Amending a Parenting Plan
The changed circumstances test in MCA 40-4-219, agreed changes, and vexatious motions.
Relocating With a Child
Written notice, the motion served 30 days ahead, and the 21-day response under MCA 40-4-217.
When a Parent Does Not Follow the Plan
Contempt, amendment, and parenting interference, and why you should never retaliate.
Grandparent Contact in Montana
When a court may order grandparent contact, and the presumption for a fit parent's wishes.
Which State Decides Custody?
The UCCJEA in Montana: home state, continuing jurisdiction, and emergency orders.
Child Support
Child Support in Montana
Both parents owe support, the guidelines amount is presumed correct, and a variance needs findings.
How Child Support Is Calculated
The guidelines worksheet in order: income, allowances, parental shares, and the transfer payment.
What Counts as Income for Child Support
Wages, benefits, business income, and imputed income, plus what the guidelines exclude.
Parenting Time and Child Support
The 110-day threshold, how days are counted, and why equal time is not zero support.
Medical Support and Health Insurance
Who must insure the children, how uncovered costs are split, and what reasonable cost means.
Modifying Child Support
The standard for changing an order, administrative review, and the bar on retroactive changes.
When Does Child Support End?
Emancipation, high school graduation, the 19th birthday limit, disability, and college.
Child Support Enforcement
Income withholding, liens, license suspension, tax refund offsets, and contempt.
Unpaid Child Support and Interest
Why arrears cannot be reduced later, what the law says on interest, and the 10-year limit.
Child Support for Self-Employed Parents
Business income, allowable expenses, straight line depreciation, and the records required.
Who Claims the Child on Taxes?
The federal custodial-parent rule, Form 8332, and what a Montana decree can require.
Can Parents Agree to No Child Support?
The guidelines apply to agreements too, and a court must find any variance justified.
The Court Process
Montana Divorce Timeline
The stages of a contested case from petition to decree, and what sets the pace.
How Long Does a Divorce Take?
What Montana law fixes, such as 21 days after service, and what it leaves open.
Discovery in a Divorce
Interrogatories, document requests, depositions and subpoenas, with the response deadlines.
Divorce Court in Missoula County
The Fourth Judicial District Court, the Clerk, standing masters, and the local rules.
What Happens at a Divorce Hearing
Uncontested and contested hearings, what the judge must find, and when one can be skipped.
The Final Decree of Dissolution
What the decree contains, when it is final, and which parts can be changed later.
Appealing a Divorce Decree
The 30-day notice of appeal, what the Supreme Court reviews, and required mediation.
Reopening a Divorce Judgment
Rule 60(b) grounds and time limits, and the remedy for undisclosed assets.
Contempt in Family Court
What counts as contempt, how the hearing works, penalties, and what to bring.
Restoring Your Name After Divorce
Getting a former name back in the decree, or by a separate name change petition.
Orders of Protection During Divorce
Temporary injunctions and orders of protection, and how they fit a parenting plan.
Moving Out of State During Divorce
Jurisdiction, the home state rule for children, relocation notice, and remote testimony.
Special Situations
Divorce After a Long Marriage
How marriage length figures in property, maintenance, retirement, and Social Security.
Divorce After 50
Retirement accounts, Medicare, Social Security, and beneficiary updates later in life.
Divorce After a Short Marriage
Duration as a factor, premarital property, and why maintenance is harder to justify.
Military Divorce in Montana
Filing while stationed here, SCRA stays and default rules, and military retired pay.
When Your Spouse Lives in Another State
What a Montana court can and cannot decide about an out-of-state spouse.
Divorce During Pregnancy
What the petition must say, why summary dissolution is out, and the parentage presumption.
Divorce and Domestic Violence
Safety, orders of protection, the mediation exception, and parenting when there has been abuse.
Divorce With a Special Needs Child
Parenting plans, support past 19 for a child with a disability, and benefits planning.
Same-Sex Divorce in Montana
Same statutes for every couple. Marriage date and legal parentage need extra care.
Divorce for Stay-at-Home Parents
Homemaker contributions, maintenance and training time, temporary support, and fee awards.
Property in Another State
How a Montana decree reaches out-of-state real estate and why recording there matters.
Immigration Status and Divorce
Conditional residence, the joint filing waiver, and affidavit of support duties after divorce.
Life After Divorce
After the Divorce Checklist
What still has to be done once the decree is entered: deeds, retirement orders, beneficiaries, taxes.
Transferring the House and Refinancing
A deed changes the title, not the mortgage. Refinance, assumption, and the realty transfer certificate.
Getting the QDRO Done
The steps to get a retirement plan to honor the decree, and why waiting is risky.
Taxes the Year You Divorce
Filing status turns on December 31. Head of household, dependents, withholding, old joint returns.
Wills and Beneficiaries After Divorce
What Montana law revokes automatically on divorce, what it misses, and why to update anyway.
Dating and Remarriage After Divorce
When you can remarry and what it does to maintenance, child support, and the parenting plan.
Co-Parenting After Divorce
Making the parenting plan work: communication, exchanges, dispute resolution, and going back to court.
When Your Ex Stops Paying
Missed support or maintenance: what to document, how CSSD helps, and contempt and other remedies.
Moving After Divorce With Children
Written notice, the 30-day motion, the 21-day response, and long-distance schedules.
Credit and Joint Accounts After Divorce
Creditors are not bound by the decree. How to separate joint accounts and watch your credit.
Keeping Divorce Records Private
What is public in a Montana divorce file, what is sealed by law, and what a judge can seal.
Can You Change a Decree Later?
Parenting and support can be modified on the right showing. The property division mostly cannot.
Getting Ready & Getting Help
How to prepare, what drives the cost, and how to decide whether and whom to hire.
Preparing & Costs
Preparing for Divorce in Montana
What a court decides, what to gather, how to choose a process, and what to avoid.
What a Divorce Costs in Montana
The court fees set by statute and the factors that drive everything else.
Divorce Documents Checklist
The records to collect and how they tie to Montana's sworn disclosure rules.
Should I Move Out of the House?
Leaving does not forfeit your share. It can affect parenting, bills, and safety.
What Not to Do During a Divorce
The mistakes Montana law treats most seriously, and what to do instead.
Protecting Your Finances Lawfully
What the automatic restraining order allows and restrains with accounts and credit.
Telling Your Children About Divorce
Pediatric guidance on the conversation, plus Montana's parent education rules.
When Is the Right Time to File?
Residency, the tax year, the Social Security 10-year rule, and interim orders.
Reconciliation and Dismissing a Case
How to pause or end a filed divorce, and what happens to temporary orders.
Divorce and Your Mental Health
Getting support, how therapy records are protected, and when health affects parenting.
Social Media and Texting in Divorce
Posts and texts as evidence, why not to delete, and staying out of a spouse's accounts.
Montana Divorce Myths
Fault, 50/50, custody, title, separation, and alimony myths corrected by statute.
Hiring a Lawyer
Do I Need a Lawyer for Divorce?
Montana does not require one. When going without is realistic and when it is risky.
How to Choose a Divorce Lawyer
What to compare, and what the ethics rules say about the claims lawyers make.
Questions to Ask a Divorce Lawyer
A first-meeting list on process, staffing, communication, and fees, with reasons.
What to Bring to a Consultation
A timeline, a financial snapshot, your questions, and any papers served.
How Divorce Lawyers Charge
Hourly and flat fees, deposits held in trust, and why contingent fees are barred.
Mediator vs. Lawyer vs. Neutral
Who each one works for, who gives advice, and who makes the decisions.
What a Divorce Lawyer Actually Does
The work stage by stage, and the decisions that stay yours.
Working With Your Divorce Lawyer
Honest disclosure, protected communications, and habits that control cost.
Changing Divorce Lawyers
How substitution works, what happens to your file, and timing near trial.
Can My Spouse Pay My Attorney Fees?
When a court may order one spouse to pay the other's fees, and what to show.
Free and Low-Cost Divorce Help
Legal aid, court self-help centers, the bar referral service, and fee waivers.
When to Talk to a Lawyer Before Separating
Why an early conversation helps before you move out, sign, or change finances.
The Numbers in a Montana Divorce
These figures come straight from the statutes. Most of a divorce has no fixed timetable; these are the points that do.
| Number | What it governs | MCA |
|---|---|---|
| 90 days | How long one spouse must have been domiciled in Montana, or stationed here in the armed services, before the case is filed. | § 40-4-104(1)(a) |
| 180 days | Living separate and apart for more than this long is one way to show the marriage is irretrievably broken. Serious marital discord is the other, so separation is not required. | § 40-4-104(1)(b) |
| 21 days | The time the other spouse has to file a response after being served. A decree may not be entered before those 21 days have passed. | § 40-4-105(3) |
| 6 months | The earliest a decree of legal separation can be converted to a decree of dissolution, on either spouse's motion. | § 40-4-108(2) |
| $50,000 | The ceiling on total assets, excluding secured obligations, for the summary dissolution procedure. Other conditions also apply. | § 40-4-130(6) |
| $20,000 | The ceiling on unpaid, unsecured debts incurred since the marriage for summary dissolution. | § 40-4-130(5) |
Pages for a Specific Family Law Matter
The guide above answers questions. These pages cover the family law matters we handle.
Montana Divorce Guide, Common Questions
What are the grounds for divorce in Montana?
How long do you have to live in Montana to file?
Is property split 50/50 in a Montana divorce?
Does it matter who was at fault?
Is alimony automatic in Montana?
Who wrote this guide?
Thinking About Divorce in Western Montana?
Understanding your options early makes every later decision easier. Call 406-830-3060 for a confidential consultation with a family law attorney.