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Unless you breach the criminal code which of course is not anything you are considering, you can charge whatever interest rate you want so long as you make it clear at the time you are providing the service that you will be charging this interest rate.It would not make sense not to charge a reasonable interest rate because if you don't adhere to community standards for your type of service in Ontario then you will lose clients but there is nothing unlawful about about charging a higher interest rate so long as you make it clear from the start what that interest rate is.
If there was no agreement about interest then the court order the interest be paid, if you are owed the money in the eyes of the Court.
You will receive an order for both pre-judgment and post judgment interest. The rate of interest is set up by regulation and the court will order that interest only. So if there is no agreement the regulation will set the interest for the judgment.
You should be seeking interest pursuant to the courts of Justice Act. Here is a link to the interest rateshttps://www.attorneygeneral.jus.gov.on.ca/english/courts/interestrates.php
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