Ontario Prejudgment and Postjudgment Interest Calculator

Ontario – Prejudgment Interest Calculator under s. 128 of the Courts of Justice Act

Do not use for non-pecuniary damages in personal injury cases.

Step 1. When did the “cause of action” arise?*

Step 2. When did you (or the other side) start the lawsuit?**

Step 3. How much money did the court award?

Step 4. When did the Court award the amount from step 3 (also known as the date of judgment)?

Ontario – Postjudgment Interest Calculator under s. 129 of the Courts of Justice Act

Step 1. How much money did the court award?***

Step 2. When did the Court award the amount from step 1 (also known as the date of judgment)?

Step 3. When do you (or the other side) expect to receive the amount from step 1?

* 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.

*** Include costs and prejudgment interest.

Disclaimer: Use as a reference tool only. This calculator does not address (i) partial payments, (ii) 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, (iii) causes of action for prejudgment interest that arose before Q4 of 1989, and (iv) causes of action for postjudgment interest that arose before Q1 of 1985. Applicable interest rates are obtained through Ontario.ca. Questions comments? Email admin@courtready.ca.

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