Ontario Prejudgment and Postjudgment Interest Calculator

Prejudgment Interest Q1 2026 = 2.5%. Postjudgment Interest Q1 2026 = 4.0%.

PREJUDGMENT
POSTJUDGMENT
Share your rating:
Total: 75. Average: 4.8.

Ontario Prejudgment Interest Calculator (s. 128 CJA)

Version 1.1 – Last updated on January 19, 2026.

1
When did the “cause of action” arise? Select date below. *
2
When did you (or the other side) start the lawsuit? Select date below. **
3
How much money did the court award? Do not include any costs awarded here. ***
4
When did the Court award the amount from step 3 (i.e., date of judgment or order)? Select date below.

Ontario Postjudgment Interest Calculator (s. 129 CJA)

Version 1.1 – Last updated on January 19, 2026.

1
How much money did the court award, including costs and prejudgment interest? ****
2
When did the Court award the amount from step 1 (i.e., date of judgment or order)? Select date below.
3
When do you (or the other side) expect to receive the amount from step 1? Let’s call this the “Full Payment Date”. Pick one of the two options below.
Specific date:
Days from judgment or order:

Partial Payments

Optional

If you (or the other side) made partial payments before the Full Payment Date, add them here, including the payment amount in the first box and the payment date in the second box. Leave empty if paid in full at once.

For questions or comments, please email Tom at admin@courtready.ca.

* This is the date when the legal wrong occurred. For example, this is the date a payment was due but not paid under an agreement.

** This is the date when the Court issued (i.e., put its stamp on) the “Notice of Action” or the “Statement of Claim”, whichever date is earlier.

*** See section 128(1)(4) of the Courts of Justice Act.

**** Postjudgment interest accumulates on the amount the court orders plus costs (as ordered by the court) and the prejudgment interest (if any). See source.

ontario prejudgment interest calculator, ontario postjudgment interest calculator

Disclaimer: Use as a reference tool only. Courtready’s Ontario judgment interest calculator does not address (i) prejudgment interest for non-pecuniary damages in personal injury cases under section 128(2) of the Courts of Justice Act and rule 53.10 of the Rules of Civil Procedure, (ii) causes of action for prejudgment interest that arose before Q4 of 1989, and (iii) causes of action for postjudgment interest that arose before Q1 of 1985.

Applicable interest rates are obtained through Ontario.ca. Questions or comments about Courtready’s Ontario judgment interest calculator? Email admin@courtready.ca.

Flight Delay Compensation Calculator
Flight Delay Compensation Calculator

Use this free tool to assess your entitlements when your flight is delayed or cancelled.

previous arrow
next arrow

About Us: Our goal is to empower Canadians with the right tools and knowledge to navigate our justice system with confidence. Check out our other free tools above.

You can also learn about how to navigate Ontario’s Small Claims Court and your rights as a consumer in Ontario with Courtready Academy!

ontario prejudgment interest calculator; ontario prejudgment interest calculator; ontario prejudgment interest calculator.

ontario postjudgment interest calculator, ontario postjudgment interest calculator, ontario postjudgment interest calculator