How a Canadian mortgage calculator works
The calculators run in your browser. What makes a Canadian mortgage calculator Canadian is the compounding: fixed rates compound semi-annually, not monthly, the convention under the Interest Act. On $100,000 at 5% over 25 years that gives $581.60 a month, the figure the federal government’s calculator prints. Compounded monthly, the same loan would show $584.59.
Where a calculator tests what you qualify for, it applies the stress test: the greater of your rate plus 2% and 5.25%. With less than 20% down the mortgage is insured and the premium is added to it; with 20% or more it is uninsured and there is none.