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 | Authority | Basis |
|---|---|---|---|---|
| Post-judgment interest | 9.75% | January 1, 2026 | Mont. Code Ann. § 25-9-205 | Statutory formula / table |
| Prejudgment interest | 10% / 9.75% | July 9, 2026 | MCA 31-1-106 (10% legal, via 27-1-211); 27-1-210 (tort, prime+3%) | Fixed by statute |
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 prejudgment interest rate is 10% / 9.75% per year (fixed by statute). Montana prejudgment interest is 10% simple for liquidated/contract claims (the legal rate, MCA §31-1-106), but tort prejudgment interest is prime + 3% — currently 9.75% — under §27-1-210.
→ 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's prejudgment interest rate is 10% / 9.75% per year (fixed by statute). Montana prejudgment interest — 10% for liquidated claims, 9.75% for the current tort benchmark.
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 recorded effective 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.