Montana Divorce Guide
Everything you need to know about filing for divorce in Montana — residency requirements, costs, forms, timelines, and how to file without a lawyer. Updated for 2026.
Montana Divorce at a Glance
| Residency Requirement | 3 months in state |
| Waiting Period | 20 days — Under Mont. Code Ann. § 40-4-126, no decree of dissolution may be entered until at least 20 days after the respondent was served with the summons and petition. For joint petitions, the 20-day waiting period runs from the date the joint petition was filed. |
| Filing Fee | $250(fee waiver available) |
| No-Fault Grounds | Irretrievable Breakdown |
| Fault Grounds | None |
| Property Division | Equitable Distribution |
| E-Filing | Available — Montana courts offer e-filing through the Montana Courts Electronic Filing System (https://mtefile.courts.mt.gov/). Availability varies by county. Currently, only attorneys may e-file; self-represented litigants must file paper documents in person or by mail. |
| Response Window | 21 days — Under Mont. R. Civ. P. 12(a), the respondent has 21 calendar days from the date of service to file a written response with the Clerk of District Court. |
Grounds for Divorce in Montana
Irretrievable breakdown of the marriage
No-Fault Grounds
- Irretrievable Breakdown — Under Mont. Code Ann. § 40-4-104(1), a court shall enter a decree of dissolution if it finds that the marriage is irretrievably broken. Per Mont. Code Ann. § 40-4-107, the court may find irretrievable breakdown if the parties have lived separate and apart for more than 180 days before filing, or if there is serious marital discord that adversely affects the attitude of one or both parties toward the marriage.
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How to File for Divorce in Montana
Meet Residency Requirements
You must have lived in Montana for at least 3 months before filing. Under Mont. Code Ann. § 40-4-104, either spouse must have been domiciled in Montana (or stationed there as a military servicemember) for at least 90 days immediately before filing the petition for dissolution. When minor children are involved, the children must have resided in Montana for at least six months before filing, per the Uniform Child Custody Jurisdiction and Enforcement Act (Mont. Code Ann. § 40-7-201).
Complete Your Forms
Montana requires 4 mandatory forms to initiate a divorce. See the full forms list.
File with the Court
File your petition and pay the $250 filing fee. E-filing is available in some counties.
Serve Your Spouse
Accepted service methods: Personal Service by Sheriff or Process Server, Acknowledgment of Service, Service by Mail, Service by Publication. Under Mont. R. Civ. P. 4, the petitioner may not personally serve the respondent. Service must be completed by a person who is at least 18 years old and not a party to the action.
Wait for Response & Finalize
Your spouse has 21 days to respond. After the 20-day waiting period, the court can issue your final decree.
Special Rules in Montana
Purely No-Fault State
Montana is a purely no-fault divorce state. The only ground for dissolution is irretrievable breakdown of the marriage. Fault or misconduct cannot be raised as grounds and is not considered in property division or maintenance determinations (Mont. Code Ann. § 40-4-107).
Automatic Economic Restraining Order
Upon filing the petition, an automatic temporary restraining order takes effect prohibiting both parties from transferring, encumbering, concealing, or disposing of marital property without written consent or court order (Mont. Code Ann. § 40-4-121(3)).
Mandatory Financial Disclosure
Both parties must complete and exchange financial disclosure forms (MP-500 and MP-510) before the dissolution can be finalized. Failure to provide complete disclosure may delay proceedings.
Montana Family Transition Project
The Montana courts offer free family mediation services through the Montana Family Transition Project (MFTP), a partnership between Montana Legal Services Association and the Office of the Court Administrator, available to separating couples with children.
Mandatory Requirements
Financial Disclosure
Both parties must exchange financial disclosures within 30 days of filing.
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