2026 Montana judgment & prejudgment interest rates
Current 2026 snapshot: Montana post-judgment interest is 9.75% per year; the recorded prejudgment reference is 10% / 9.75% per year.
Everything Montana charges in interest on a money judgment or an overdue debt, in one place — the rate after judgment and the rate before it, each recorded with a cited source and linked to its full page with observations, scope, and known carve-outs.
| Metric | Rate or rule | Effective / reference date | Authority | Basis |
|---|---|---|---|---|
| Post-judgment interest | 9.75% | January 1, 2026 | Mont. Code Ann. § 25-9-205 | Statutory formula / table |
| Prejudgment interest | 10% / 9.75% | Recorded reference date: July 9, 2026 | MCA 31-1-106 (10% legal, via 27-1-211); 27-1-210 (tort, prime+3%) | Mixed statutory branches |
Post-judgment interest
Montana's post-judgment interest rate is 9.75% per year. Montana post-judgment interest is currently 9.75% — a statutory formula rate under Mont. Code Ann. § 25-9-205 that resets periodically.
→ Full Montana post-judgment page — Mont. Code Ann. § 25-9-205, effective-date history, scope, and official source.
Prejudgment interest
Montana's recorded headline prejudgment branch is 10% / 9.75% per year; another claim-specific branch may control. Montana’s 10% branch under MCA §31-1-106 applies only to specifically enumerated due-money categories. Qualifying certain or calculable damages under §27-1-211 instead use the §25-9-205 judgment-rate benchmark under DeBuff and Warrington—currently 9.75%—and the separate §27-1-210 tort branch also currently uses 9.75%.
→ Full Montana prejudgment page — MCA 31-1-106 (10% legal, via 27-1-211); 27-1-210 (tort, prime+3%), when it applies, accrual, compounding, and carve-outs.
Frequently asked
What is the post-judgment interest rate in Montana?
As of January 1, 2026, the Montana post-judgment interest rate is 9.75% per year. Montana judgment interest — a formula rate, reset periodically.
What is the prejudgment interest rate in Montana?
Montana uses multiple prejudgment branches. The recorded headline branch is 10% / 9.75% per year, but claim-specific authority controls. The 10% due-money branch and the variable certain-damages/tort branches have different statutory predicates.
Is Montana judgment interest simple or compound, and when does it start?
See each rate's page for the exact compounding rule, accrual date, and statutory carve-outs — Montana prejudgment interest in particular turns on the type of claim.
Cite this page
StatuteRates. “Montana Judgment & Prejudgment Interest Rates.” StatuteRates.com. Accessed today. https://statuterates.com/states/montana/ Each rate includes a cited source and an effective or recorded-reference date; confirm the controlling authority before use.
Compare every state on the state interest-rate index and the prejudgment interest index, or enter a confirmed rate in the judgment interest and per-diem calculator. Reference data only — not legal advice.