Montana Alimony Calculator
Estimate spousal support (maintenance) amount and duration in Montana. Updated for 2026.
Last reviewed July 2026 · Free · Nothing you enter is stored
Judicial discretion state
$0
estimated monthly spousal support ·
Educational estimate, not legal advice. Alimony in Montana is discretionary — actual awards vary widely by judge and circumstances.
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How alimony works in Montana
Montana does not use a fixed statutory formula for alimony amounts. Judges weigh statutory factors — length of the marriage, each spouse's income and earning capacity, age and health, standard of living, and contributions to the marriage. Our calculator uses the AAML guideline formula (30% of payor's income minus 20% of recipient's) that attorneys commonly use for ballpark estimates.
Governing law: Mont. Code Ann. § 40-4-203 — Need-based and discretionary — decided without regard to marital misconduct and with no guideline formula.
Frequently asked questions
How is alimony calculated in Montana?
Montana does not use a fixed statutory formula for alimony amounts. Judges weigh statutory factors — length of the marriage, each spouse's income and earning capacity, age and health, standard of living, and contributions to the marriage. Our calculator uses the AAML guideline formula (30% of payor's income minus 20% of recipient's) that attorneys commonly use for ballpark estimates. See Mont. Code Ann. § 40-4-203.
How long does alimony last in Montana?
Duration is generally tied to the length of the marriage. Short marriages (under ~5 years) typically produce short-term or no support; long marriages (20+ years) can produce long-term support. Montana courts set duration case-by-case.
What types of alimony does Montana recognize?
Montana recognizes: temporary, rehabilitative/fixed-term, long-term (rare). Need-based and discretionary — decided without regard to marital misconduct and with no guideline formula.
Is alimony taxable in Montana?
For divorces finalized after 2018, federal law (TCJA) makes alimony non-deductible for the payer and non-taxable for the recipient. A few states differ for state income tax — confirm with a tax professional.
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