Washington judgment & prejudgment interest rates
Everything Washington 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 | 8.75% | Set by statute |
| Prejudgment interest | 12% | Fixed by statute |
Post-judgment interest
Washington's post-judgment interest rate is 8.75% per year. Since a 2019 amendment to RCW 4.56.110, Washington ties tort and general judgment interest to the federal prime rate — currently about 8.75% — while judgments on a written contract carry the contract’s own rate. It’s simple interest.
→ Full Washington post-judgment page — statute, effective-date history, and source.
Prejudgment interest
Washington's prejudgment interest rate is 12% per year (fixed by statute). Washington prejudgment interest is 12% per year, as simple interest under RCW 19.52.010(1). Prejudgment interest is available ONLY on LIQUIDATED or readily-determinable claims — those where the evidence furnishes data that makes it possible to compute the amount with exactness,…
→ Full Washington prejudgment page — when it applies, accrual, compounding, and carve-outs.
→ Calculate Washington prejudgment interest
Frequently asked
What is the post-judgment interest rate in Washington?
As of July 8, 2026, the Washington post-judgment interest rate is 8.75% per year. Washington judgment interest — prime-linked since 2019.
What is the prejudgment interest rate in Washington?
Washington's prejudgment interest rate is 12% per year (fixed by statute). Prejudgment interest is available ONLY on LIQUIDATED or readily-determinable claims — those where the evidence furnishes data that makes it possible to compute the amount with exactness,…
Is Washington 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 — Washington 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.