Payment Shock

Payment shock is a sharp increase in your regular mortgage payment, most often triggered when a mortgage term ends and you renew, or when the interest rate on a variable-rate mortgage rises. The payment does not change because you borrowed more; it changes because the interest rate applied to your existing balance is higher than before.

In Canada, mortgage rates move with the Bank of Canada's policy interest rate and with lender funding costs. A borrower who locked in during a period of low rates can face a noticeably larger payment when the term matures and the new rate is higher. Nothing about the home or the loan changed — only the cost of the money.

What causes payment shock

Two mechanisms produce it:

• Renewal at a higher rate. At the end of each term, the lender offers a new rate and a new term. If the new rate exceeds the old one, the payment rises even though the amortization period is unchanged.
• A rising prime rate. On an adjustable-rate variable mortgage, the payment itself moves whenever the lender's prime rate moves. On a static-rate variable mortgage, the payment stays the same but more of it goes to interest, and the shock arrives at renewal instead.

How the payment changes by product

Why it matters

Payment shock matters because housing costs are usually the largest line in a household budget. A payment that rises faster than income can strain cash flow and make it harder to keep up with other obligations such as property tax, insurance, and unsecured debt.

Borrowers can shop the renewal rather than accept the lender's first offer, estimate the new payment with the renewal calculator, lengthen the amortization to lower the payment (which increases total interest), or ask about a blend and extend. Increasing payment frequency or making lump-sum payments earlier can also shrink the balance the higher rate applies to. Lenders may have options when a payment is unaffordable, and raising the issue early is generally better than missing a payment.