Montana prejudgment interest branches
United States Montana prejudgment interest — 10% for listed due-money claims, 9.75% for current certain-damages and tort branches.
→ All Montana judgment & prejudgment interest rates
Statutory branches Mixed statutory branches
2026 Montana prejudgment interest branches at a glance
- Headline branch
- 10% / 9.75% per year (branch shown)
- Recorded reference date
- July 9, 2026
- Controlling authority
- MCA 31-1-106 (10% legal, via 27-1-211); 27-1-210 (tort, prime+3%)
- Rate basis
- Statutory branches
- Source checked
- July 9, 2026
- Recorded history
- 1 data point
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%.
When Montana prejudgment interest applies
Section 31-1-106 covers its listed instruments, accounts, loans, settlements, and money held for another. Section 27-1-211 applies only when damages are certain or capable of calculation and the right vested on a particular day. Section 27-1-210 separately governs qualifying tort claims. Section 27-1-212 permits a discretionary noncontract fraud, oppression, or malice branch but supplies no generic percentage, so that path remains calculator-withheld.
When it starts accruing
For qualifying §27-1-211 damages, interest runs from the day the right to recover vested, excluding a period when payment was legally prevented or prevented by the creditor. The due-money and tort branches have their own triggers and conditions.
Simple or compound
The cited authorities do not establish one universal Montana prejudgment compounding method. Section 25-9-205 expressly bars compounding for postjudgment interest, but §27-1-210 does not say that and the cited cases import the §25-9-205 rate without clearly importing every calculation rule.
→ Compare with the Montana post-judgment interest rate (interest after judgment)
Montana prejudgment interest is 10% simple for liquidated/contract-type claims — the legal rate (MCA §31-1-106), applied via the right-to-interest statute §27-1-211. TORT prejudgment interest is instead prime + 3% — currently 9.75% (variable, reset each Jan 1) under §27-1-210. Verified 2026-07-11. Not legal advice.
Current recorded observation
| Recorded reference date | Rate | Basis |
|---|---|---|
| July 9, 2026 | 10% / 9.75% | Statute |
Source & provenance
Observation recorded July 9, 2026 (00:00 UTC) from the cited source (Montana — mca.legmt.gov):
https://mca.legmt.gov/bills/mca/title_0270/chapter_0010/part_0020/section_0110/0270-0010-0020-0110.html
Cite this page
StatuteRates. “Montana Prejudgment Interest Rate.” StatuteRates.com. Accessed today. https://statuterates.com/rates/montana-prejudgment-rate/ Rate recorded under MCA 31-1-106 (10% legal, via 27-1-211); 27-1-210 (tort, prime+3%); current-code reference checked for July 9, 2026.