Maintenance (alimony) in Montana lasts as long as the decree or the spouses' agreement says it lasts. When a judge decides, the statute directs an order "for periods of time that the court considers just" (MCA § 40-4-203(2)). There is no schedule, and nothing in the code converts years of marriage into years of payments. This page is part of our Montana Divorce Guide.
What the Statute Says About Duration
The same sentence of § 40-4-203(2) governs both amount and length. The court sets them together, without regard to marital misconduct, after considering all relevant facts. Several of the six listed factors speak to time in particular:
- Education and training. "The time necessary to acquire sufficient education or training to enable the party seeking maintenance to find appropriate employment."
- Length of the marriage. "The duration of the marriage."
- Age and health. "The age and the physical and emotional condition of the spouse seeking maintenance."
- Ability to pay. The paying spouse's ability to meet their own needs while paying.
Read together, the factors point the court toward the question of how long the need will reasonably continue. For one spouse that may be the time it takes to finish a degree or re-enter a field. For another, age or health may mean the need is not expected to end. Our pages on divorce after a short marriage and divorce after a long marriage look at how those facts differ.
No Formula, No Rule of Thumb
You will find claims online that maintenance runs for half the length of the marriage, or one year for every three. Those rules come from other states or from nowhere. They are not in the Montana Code. Because the statute leaves the period to what the court considers just, no one can tell you a duration from the length of your marriage alone, and we do not predict one.
The practical result is that duration is a term spouses can negotiate. Spouses who agree can choose a period that fits their plans, such as the time one of them needs to complete training.
It also helps to remember that the period is decided together with the amount and after the property division. One of the listed factors is the marital property apportioned to the spouse asking for maintenance (§ 40-4-203(2)(a)). A spouse who receives more property may need maintenance for a shorter time, or not at all, and the reverse can be true as well. Looking at the period in isolation misses how the pieces of a decree fit together.
When Maintenance Ends
| Event | Effect | MCA |
|---|---|---|
| The end date in the decree or agreement | The order or agreement sets the period. When it runs out, the obligation ends. | § 40-4-203(2); § 40-4-201 |
| Death of either party | Ends the obligation to pay future maintenance, unless otherwise agreed in writing or expressly provided in the decree. | § 40-4-208(4) |
| Remarriage of the recipient | Ends the obligation to pay future maintenance, unless otherwise agreed in writing or expressly provided in the decree. | § 40-4-208(4) |
| A court order modifying the decree | Requires changed circumstances so substantial and continuing as to make the terms unconscionable, or written consent of the parties. | § 40-4-208(2)(b) |
The full text of the automatic rule is short: "Unless otherwise agreed in writing or expressly provided in the decree, the obligation to pay future maintenance is terminated upon the death of either party or the remarriage of the party receiving maintenance" (MCA § 40-4-208(4)). Note the word "future." Payments that were already due and unpaid before the ending event are a separate matter.
New Relationships, Retirement, and Other Changes
The automatic rule names two events. It does not mention a recipient living with a new partner, a paying spouse's retirement, a job loss, or a raise. Those changes do not end or alter maintenance by themselves. They are handled, if at all, through a motion to modify, and the bar is high: changed circumstances "so substantial and continuing as to make the terms unconscionable" (MCA § 40-4-208(2)(b)(i)).
A court can modify maintenance only as to installments that come due after the other party has actual notice of the motion (§ 40-4-208(1)). So a paying spouse who simply stops, expecting a judge to approve it later, keeps owing every payment in the meantime. See modifying or ending maintenance.
Setting the Period by Agreement
A written separation agreement can set maintenance terms, and the court is bound by them unless it finds the agreement unconscionable (MCA § 40-4-201(2)). An agreement can do things a statute-based order might not:
- fix an exact end date or a step-down schedule;
- say what happens on remarriage, a new household, or retirement;
- continue payments after the payer's death, often backed by life insurance;
- expressly preclude or limit later modification (§ 40-4-201(6)).
A non-modifiable term gives both spouses certainty, and it cuts both ways. The payer cannot reduce it after a setback, and the recipient cannot extend it if the need continues. Read our guide to the marital settlement agreement before signing one.
Maintenance While the Case Is Pending
Temporary maintenance during the case is a separate order under a separate statute, and it does not decide how long final maintenance will last. See temporary maintenance during divorce. For the test a spouse has to meet before any period is set, see who qualifies for maintenance.
This page explains Montana law in general as of the 2025 Montana Code Annotated. It is not legal advice about your specific case.