Prejudgment Interest Ontario Calculator

Prejudgment interest is a legal concept in Ontario that allows a court to award interest on a judgment debt from the date the claim arose, even before the judgment is finalized. This calculator helps you determine how much prejudgment interest you may be entitled to or must pay.

What is Prejudgment Interest?

Prejudgment interest is interest that accrues on a debt from the date the claim arises, rather than from the date of judgment. In Ontario, prejudgment interest is typically calculated at the same rate as post-judgment interest, which is usually the Bank of Canada's overnight rate plus a premium.

The purpose of prejudgment interest is to compensate the claimant for the time value of money while the legal process is ongoing. It ensures that both parties are treated fairly, as the debtor would have earned interest on the debt if it had been paid immediately.

Prejudgment interest is different from post-judgment interest. Post-judgment interest typically starts from the date of judgment, while prejudgment interest starts from the date the claim arose.

How to Calculate Prejudgment Interest

The calculation of prejudgment interest involves determining the daily interest rate, the number of days the debt has been outstanding, and the principal amount of the debt. The formula for prejudgment interest is:

Prejudgment Interest = Principal Amount × Daily Interest Rate × Number of Days

The daily interest rate is typically calculated by dividing the annual interest rate by 365 (or 366 for leap years). The number of days is the period from when the claim arose to the date of judgment.

Prejudgment Interest Rates

In Ontario, prejudgment interest is usually calculated at the same rate as post-judgment interest. The current post-judgment interest rate is typically the Bank of Canada's overnight rate plus a premium. As of the latest available data, the post-judgment interest rate is approximately 5.25% per annum.

Interest Type	Current Rate (Annual)	Daily Rate
Prejudgment Interest	5.25%	0.0144%
Post-Judgment Interest	5.25%	0.0144%

It's important to note that interest rates can change over time. Always verify the current rates before making calculations.

Example Calculation

Let's say you have a debt of $10,000 that arose on January 1, 2023, and the judgment was issued on June 1, 2023. The current prejudgment interest rate is 5.25% per annum.

Number of Days = (June 1, 2023 - January 1, 2023) = 151 days

Daily Interest Rate = 5.25% ÷ 365 ≈ 0.0144%

Prejudgment Interest = $10,000 × 0.0144% × 151 ≈ $21.60

In this example, the prejudgment interest would be approximately $21.60.

Frequently Asked Questions

What is the difference between prejudgment and post-judgment interest?: Prejudgment interest starts from the date the claim arose, while post-judgment interest starts from the date of judgment. Both are typically calculated at the same rate.
How is the prejudgment interest rate determined in Ontario?: The prejudgment interest rate in Ontario is usually the same as the post-judgment interest rate, which is typically the Bank of Canada's overnight rate plus a premium.
Can prejudgment interest be claimed on all types of debts?: Prejudgment interest is generally applicable to most types of debts, including contractual debts, unpaid invoices, and certain types of personal debts.
Is prejudgment interest taxable?: Prejudgment interest is generally not taxable as income for the debtor, but it may be subject to tax deductions for the claimant.
What happens if the interest rate changes during the period?: If the interest rate changes during the period, the prejudgment interest should be calculated using the applicable rate for each period.