Idaho judgment & prejudgment interest rates
Everything Idaho charges in interest on a money judgment or an overdue debt, in one place — the rate after judgment and the rate before it, each verified against the statute and linked to its full page with sources, history, and carve-outs.
| Metric | Rate | Basis |
|---|---|---|
| Post-judgment interest | 8.875% | Set by statute |
| Prejudgment interest | 12% | Fixed by statute |
Post-judgment interest
Idaho's post-judgment interest rate is 8.875% per year. Idaho post-judgment interest is currently 8.875% — a statutory formula rate under Idaho Code § 28-22-104(2) that resets each year. § 28-22-104(2) applies "unless the judgment is rendered on a written contract or agreement providing for a different rate of interest, in which case…
→ Full Idaho post-judgment page — statute, effective-date history, and source.
Prejudgment interest
Idaho's prejudgment interest rate is 12% per year (fixed by statute). Idaho prejudgment interest is 12% per year, as simple interest under Idaho Code 28-22-104(1). Prejudgment interest is available ONLY where the claim is liquidated OR the amount is ascertainable by a mere mathematical process.
→ Full Idaho prejudgment page — when it applies, accrual, compounding, and carve-outs.
→ Calculate Idaho prejudgment interest
Frequently asked
What is the post-judgment interest rate in Idaho?
As of July 1, 2026, the Idaho post-judgment interest rate is 8.875% per year. Idaho judgment interest — a formula rate, reset each year.
What is the prejudgment interest rate in Idaho?
Idaho's prejudgment interest rate is 12% per year (fixed by statute). Prejudgment interest is available ONLY where the claim is liquidated OR the amount is ascertainable by a mere mathematical process.
Is Idaho 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 — Idaho prejudgment interest in particular turns on the type of claim.
Compare every state on the state interest-rate index and the prejudgment interest index, or run the numbers with our interest calculators. Reference data only — not legal advice.