Calculate postjudgment interest under section 129 of the Courts of Justice Act on an unpaid judgment. Enter the order date and the calculator selects the correct quarterly rate automatically — then computes the simple interest accruing until payment. Updated for 2026.
· Reviewed by Jonathan Kleiman, J.D.
Postjudgment interest is calculated under section 129 of the Courts of Justice Act using the quarterly rate published by the Ontario Ministry of the Attorney General. Enter the date of the order and the calculator picks the right rate for you. The current postjudgment rate (Q2 2026) is 4.0%.
Enter your judgment details below. Fields marked with * are required.
Once you have a judgment, the amount owing keeps earning interest until it is paid. This postjudgment interest is governed by section 129 of the Courts of Justice Act and calculated as simple interest at the rate published quarterly by the Ministry of the Attorney General.
Interest = Judgment Amount × Rate × Days ÷ 365
Where Rate is the postjudgment rate for the quarter the order was made, and Days is the number of days from the date of the order to the date of payment.
The postjudgment rate is fixed by the quarter in which the order was made. That single rate applies for the entire time the judgment remains unpaid — it does not change as later quarters bring new rates, even if the judgment goes unpaid for years.
| Quarter | Prejudgment Rate | Postjudgment Rate |
|---|---|---|
| Q2 2026 (Apr – Jun) | 2.5% | 4.0% |
| Q1 2026 (Jan – Mar) | 2.5% | 4.0% |
| Q4 2025 (Oct – Dec) | 3.0% | 4.0% |
| Q3 2025 (Jul – Sep) | 3.0% | 4.0% |
| Q2 2025 (Apr – Jun) | 3.3% | 5.0% |
| Q1 2025 (Jan – Mar) | 4.0% | 5.0% |
| Q4 2024 (Oct – Dec) | 4.8% | 6.0% |
| Q3 2024 (Jul – Sep) | 5.3% | 7.0% |
| Q2 2024 (Apr – Jun) | 5.3% | 7.0% |
| Q1 2024 (Jan – Mar) | 5.3% | 7.0% |
| Q4 2023 (Oct – Dec) | 5.3% | 7.0% |
| Q3 2023 (Jul – Sep) | 4.8% | 6.0% |
Source: Ontario Ministry of the Attorney General. The calculator stores the full official series back to 2000.
A judgment that sits unpaid is not standing still — it grows. Postjudgment interest is a real, recoverable part of what a debtor owes you, and it continues until the judgment is satisfied through payment, a garnishment, a writ of seizure and sale, or another enforcement step. When you enforce, you are entitled to collect the accrued interest on top of the principal and costs.
Free 30-minute consultation. Get a clear plan to enforce and collect — interest included.
Postjudgment interest covers the period after judgment — from the date of the order until payment. Prejudgment interest covers the period before — from when your claim arose to the date of the order, at a different rate set by the quarter the proceeding was commenced. If you are still calculating what a claim is worth before judgment, use the Ontario Prejudgment Interest Calculator instead.
Enforcing a smaller judgment? The Small Claims Court Calculator and our debt collection page walk through recovery from demand through enforcement.
Postjudgment interest accrues on the money owing under a court order, from the date of the order until it is paid. It is awarded under section 129 of the Courts of Justice Act at the quarterly postjudgment rate set by the Ministry of the Attorney General, calculated as simple interest.
For Q2 2026 (April – June), the Ontario postjudgment interest rate is 4.0%. The rate that applies is the rate for the quarter in which the order was made, and it stays fixed until the judgment is paid — even if payment takes years.
Yes. It runs from the date of the order until the judgment is satisfied. The rate is fixed at the rate for the quarter the order was made and does not change as later quarters bring new rates. Partial payments reduce the balance on which interest continues to accrue.
It is simple interest — it does not compound. Interest is calculated on the amount of the order, not on previously accrued interest.
Under s. 129(5), where the judgment is for money owing under a contract that provides for a rate of interest higher than the postjudgment rate, the money owing under the order bears interest at the contractual rate instead. Enter that rate in the override field.
Postjudgment interest is collected together with the judgment through enforcement — garnishment, a writ of seizure and sale, or an examination in aid of execution. A debt collection lawyer can calculate the running total and pursue the steps that actually recover it.
Jonathan Kleiman helps businesses and individuals enforce judgments, garnish wages and accounts, and recover unpaid debts throughout Toronto and Ontario — accrued interest and costs included.
Describe your judgment and Jonathan will contact you — usually the same day.
Book a free 30-minute consultation with Jonathan. Bring your judgment, ask your questions, and leave with a clear plan to collect what you're owed — interest and costs included.