Courts of Justice Act
Court Interest Calculator
Work out prejudgment and postjudgment interest on an Ontario court claim or judgment, at the rates the Ministry of the Attorney General publishes for each quarter.
The money claimed or awarded. Interest isn't charged on costs, punitive damages or interest itself (s. 128(4)).
3Dates
The day the money became owing or the loss happened. Interest starts here (s. 128(1)).
The quarter the court case started sets the rate (s. 127(1)), for example the date on the Plaintiff's Claim.
Leave it empty to estimate the interest up to today.
Enter the date the claim was issued to see the rate.
Prejudgment interest
Fill in the amount, the dates and the rate to see the interest.
Prejudgment rate, Q4 2026For a claim issued in this quarter2.5%
Postjudgment rate, Q4 2026For a judgment made in this quarter4.0%
Show the full rate tables
Prejudgment interest rates (causes of action arising after October 23, 1989)
| Year | Q1 | Q2 | Q3 | Q4 |
|---|---|---|---|---|
| 2026 | 2.5% | 2.5% | 2.5% | 2.5% |
| 2025 | 4.0% | 3.3% | 3.0% | 3.0% |
| 2024 | 5.3% | 5.3% | 5.3% | 4.8% |
| 2023 | 4.0% | 4.8% | 4.8% | 5.3% |
| 2022 | 0.5% | 0.5% | 1.8% | 2.8% |
| 2021 | 0.5% | 0.5% | 0.5% | 0.5% |
| 2020 | 2.0% | 2.0% | 0.5% | 0.5% |
| 2019 | 2.0% | 2.0% | 2.0% | 2.0% |
| 2018 | 1.3% | 1.5% | 1.5% | 1.8% |
| 2017 | 0.8% | 0.8% | 0.8% | 1.0% |
| 2016 | 0.8% | 0.8% | 0.8% | 0.8% |
| 2015 | 1.3% | 1.0% | 1.0% | 1.0% |
| 2014 | 1.3% | 1.3% | 1.3% | 1.3% |
| 2013 | 1.3% | 1.3% | 1.3% | 1.3% |
| 2012 | 1.3% | 1.3% | 1.3% | 1.3% |
| 2011 | 1.3% | 1.3% | 1.3% | 1.3% |
| 2010 | 0.5% | 0.5% | 0.8% | 1.0% |
| 2009 | 2.5% | 1.3% | 0.5% | 0.5% |
| 2008 | 4.8% | 4.3% | 3.3% | 3.3% |
| 2007 | 4.5% | 4.5% | 4.5% | 4.8% |
| 2006 | 3.3% | 3.8% | 4.5% | 4.5% |
| 2005 | 2.8% | 2.8% | 2.8% | 2.8% |
| 2004 | 3.0% | 2.8% | 2.3% | 2.3% |
| 2003 | 3.0% | 3.0% | 3.5% | 3.3% |
| 2002 | 2.5% | 2.3% | 2.5% | 3.0% |
| 2001 | 6.0% | 5.8% | 4.8% | 4.3% |
| 2000 | 5.0% | 5.3% | 6.0% | 6.0% |
| 1999 | 5.3% | 5.3% | 4.8% | 4.8% |
| 1998 | 4.0% | 5.0% | 5.0% | 6.0% |
| 1997 | 3.3% | 3.3% | 3.3% | 3.5% |
| 1996 | 6.1% | 5.6% | 5.0% | 4.3% |
| 1995 | 6.0% | 8.0% | 7.6% | 6.6% |
| 1994 | 4.3% | 4.1% | 6.6% | 5.6% |
| 1993 | 8.3% | 6.1% | 5.1% | 5.0% |
| 1992 | 7.7% | 7.5% | 6.3% | 5.1% |
| 1991 | 12.3% | 10.0% | 9.1% | 8.8% |
| 1990 | 12.5% | 13.5% | 13.9% | 12.9% |
| 1989 | — | — | — | 12.4% |
Postjudgment interest rates
| Year | Q1 | Q2 | Q3 | Q4 |
|---|---|---|---|---|
| 2026 | 4.0% | 4.0% | 4.0% | 4.0% |
| 2025 | 5.0% | 5.0% | 4.0% | 4.0% |
| 2024 | 7.0% | 7.0% | 7.0% | 6.0% |
| 2023 | 5.0% | 6.0% | 6.0% | 7.0% |
| 2022 | 2.0% | 2.0% | 3.0% | 4.0% |
| 2021 | 2.0% | 2.0% | 2.0% | 2.0% |
| 2020 | 3.0% | 3.0% | 2.0% | 2.0% |
| 2019 | 3.0% | 3.0% | 3.0% | 3.0% |
| 2018 | 3.0% | 3.0% | 3.0% | 3.0% |
| 2017 | 2.0% | 2.0% | 2.0% | 2.0% |
| 2016 | 2.0% | 2.0% | 2.0% | 2.0% |
| 2015 | 3.0% | 2.0% | 2.0% | 2.0% |
| 2014 | 3.0% | 3.0% | 3.0% | 3.0% |
| 2013 | 3.0% | 3.0% | 3.0% | 3.0% |
| 2012 | 3.0% | 3.0% | 3.0% | 3.0% |
| 2011 | 3.0% | 3.0% | 3.0% | 3.0% |
| 2010 | 2.0% | 2.0% | 2.0% | 2.0% |
| 2009 | 4.0% | 3.0% | 2.0% | 2.0% |
| 2008 | 6.0% | 6.0% | 5.0% | 5.0% |
| 2007 | 6.0% | 6.0% | 6.0% | 6.0% |
| 2006 | 5.0% | 5.0% | 6.0% | 6.0% |
| 2005 | 4.0% | 4.0% | 4.0% | 4.0% |
| 2004 | 4.0% | 4.0% | 4.0% | 4.0% |
| 2003 | 4.0% | 4.0% | 5.0% | 5.0% |
| 2002 | 4.0% | 4.0% | 4.0% | 4.0% |
| 2001 | 7.0% | 7.0% | 6.0% | 6.0% |
| 2000 | 6.0% | 7.0% | 7.0% | 7.0% |
| 1999 | 7.0% | 7.0% | 6.0% | 6.0% |
| 1998 | 5.0% | 6.0% | 6.0% | 7.0% |
| 1997 | 5.0% | 5.0% | 5.0% | 5.0% |
| 1996 | 8.0% | 7.0% | 6.0% | 6.0% |
| 1995 | 8.0% | 10.0% | 9.0% | 8.0% |
| 1994 | 6.0% | 6.0% | 8.0% | 7.0% |
| 1993 | 10.0% | 8.0% | 7.0% | 6.0% |
| 1992 | 9.0% | 9.0% | 8.0% | 7.0% |
| 1991 | 14.0% | 11.0% | 11.0% | 10.0% |
| 1990 | 14.0% | 15.0% | 15.0% | 14.0% |
| 1989 | 13.0% | 13.0% | 14.0% | 14.0% |
| 1988 | 10.0% | 10.0% | 11.0% | 12.0% |
| 1987 | 10.0% | 9.0% | 10.0% | 11.0% |
| 1986 | 11.0% | 13.0% | 10.0% | 10.0% |
| 1985 | 12.0% | 13.0% | 11.0% | 11.0% |
From the Ministry of the Attorney General’s tables, last updated September 2, 2026. For causes of action that arose on or before October 23, 1989, the prejudgment rate is the postjudgment rate.
Good to know
- Both kinds are simple interest: the amount × the yearly rate ÷ 365 × the number of days. This is the Ministry's own method.
- Prejudgment interest runs from the day the cause of action arose to the date of the judgment, at the rate for the quarter the claim was issued (ss. 127 and 128). You have to ask for it in your claim, or the judgment won't include it.
- Postjudgment interest runs from the date of the judgment on everything owing under it, costs included, at the rate for the quarter the judgment was made, until it is paid (s. 129).
- If a contract or another law sets the interest rate, that rate applies instead (ss. 128(4)(g) and 129(5)).
- The court can refuse interest, or allow a higher or lower rate or a different period, when it considers it just (s. 130).
- The rate tables here run to Q4 2026. After that, check the Ministry's page for the newest rates.
Official sources · checked November 3, 2026
- Prejudgment and postjudgment interest rates (the quarterly rate tables and worked examples) · Ministry of the Attorney General, ontario.ca
- Courts of Justice Act, ss. 127 to 130 · Ontario e-Laws
The Ministry's rate page was last updated September 2, 2026. Worked out to the cent with the Ministry's examples ($32.88, $134.08 and $109.42).
Estimates only, from the amounts, dates and rate you enter. This is general information about interest under the Courts of Justice Act, not legal advice. The judgment or order decides what is owed, and the court can change the rate or period.
General information only, not legal advice. Read our online tools policy
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