Interest is charged at the prime lending rate of the government's banker. (www2.gov.bc.ca)
What is mean by «interest rates» is usually based on the officially published rates determined by the central bank and is referenced to the overnight lending rate for meeting reserve requirements. (money.stackexchange.com)
Paying your bills on time demonstrates to lenders that you can be trusted with future loans, and it may qualify you for a lower lending rate in the future. (fidelity.com)