A Canada-first explanation of variable-rate mortgages, including payment design, prime-linked pricing, and trigger risk.
A variable-rate mortgage is a mortgage whose rate changes during the term, usually in relation to the lender’s prime rate. Depending on the product, the payment itself may also change.
Variable-rate mortgages can offer a lower starting rate or more attractive pricing than a comparable fixed rate, but they expose the borrower to rate movement during the term. That makes them a cash-flow and risk-management decision, not just a rate-shopping decision.
Many Canadian variable mortgages are expressed as prime plus or minus a spread. When prime moves, the mortgage rate moves. Some lenders use an adjustable-payment design, where the required payment changes with the rate. Others keep the payment fixed for a time and let the split between principal and interest shift instead.
That second design is where Canada-specific concepts like a trigger rate or trigger point can matter. If rates rise enough, the normal payment may stop covering enough interest, forcing a payment increase, lump-sum adjustment, or re-amortization.
A borrower signs a variable mortgage at prime minus 0.80%. If the lender’s prime changes, the borrower’s mortgage rate changes too. If the product has an adjustable payment, the payment changes with it. If the product has a fixed payment, the payment may stay put until the contract’s trigger mechanics are hit.
Variable rate does not always mean variable payment. In Canada, those two ideas are related but not identical.
Borrowers also sometimes assume a variable mortgage will always save money over a fixed-rate mortgage. It may or may not. The result depends on the full rate path, not the opening discount alone.
Trigger mechanics, penalty calculation, and payment-change rules vary by lender and product. Read the commitment and ask how the payment behaves if prime moves materially.