2026 Washington judgment & prejudgment interest rates
Current 2026 snapshot: Washington post-judgment interest is 12% / 8.75% per year; the recorded prejudgment reference is 12% per year.
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 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 | 12% / 8.75% | July 8, 2026 | RCW 4.56.110 | Statutory formula / table |
| Prejudgment interest | 12% | July 9, 2026 | RCW 19.52.010(1) | Fixed by statute |
Post-judgment interest
Washington's post-judgment interest rate is 12% / 8.75% per year. RCW 4.56.110 does not set one Washington rate for every judgment. General “all other” money judgments use the RCW 19.52.020 maximum rate (currently 12%); unpaid consumer-debt judgments use 9%; qualifying private student-loan and non-public-agency tort judgments use the Federal Reserve prime rate from the preceding month plus two points (currently 8.75%). Written contracts, unpaid child support, and public-agency tort judgments follow separate branches.
→ Full Washington post-judgment page — RCW 4.56.110, effective-date history, scope, and official 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).
→ Full Washington prejudgment page — RCW 19.52.010(1), when it applies, accrual, compounding, and carve-outs.
Frequently asked
What is the post-judgment interest rate in Washington?
As of July 8, 2026, the Washington post-judgment interest rate is 12% / 8.75% per year. Washington’s claim-specific judgment rates under RCW 4.56.110.
What is the prejudgment interest rate in Washington?
Washington's prejudgment interest rate is 12% per year (fixed by statute). Washington’s prejudgment interest rate — when a court awards it.
Is Washington judgment interest simple or compound, and when does it start?
StatuteRates keeps the Washington payoff calculator disabled because the page models several rate branches but not every day-count, compounding, appellate, payment-allocation, and historical benchmark input needed for a deterministic result. The statute generally runs interest from entry of judgment. For specified verdicts later entered, affirmed, or reinstated on review, interest on the judgment or affirmed portion dates back to the verdict date.
Cite this page
StatuteRates. “Washington Judgment & Prejudgment Interest Rates.” StatuteRates.com. Accessed today. https://statuterates.com/states/washington/ 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.