Why the Rate Hike Hits Your Line of Credit Before Your Fixed Mortgage

If you've ever looked at the interest charged on your line of credit and then at a mortgage payment that hasn't budged, you know the uncertainty of not knowing which household cost will shift next. A rate-hike headline makes it sound as though every loan gets more expensive at once. That makes it hard to judge how much spending room you really have, even with a strong income and plenty of equity. Your loan's rate terms determine when higher interest costs reach your budget. The headline only tells you the direction.

Why your line of credit can cost more while your mortgage payment stays the same

The Bank of Canada sets a target for the overnight rate, what major financial institutions charge each other for one-day loans. Each lender sets its own prime rate, which has historically tracked the overnight rate closely, though the lender decides when and by how much to move it. Most home equity lines of credit are priced at prime plus or minus a margin, so when prime changes, the contract lets the line's rate change with it, often by the next statement.

Here's an illustration. On an unchanged $100,000 interest-only balance, a 0.25-percentage-point increase adds about $250 a year, roughly $21 a month, if the full increase reaches the line's rate. That's modest alone. It grows with a larger balance and with each additional move.

An existing fixed mortgage rate is locked for its term, so the payment holds. Variable mortgages come in two kinds. Adjustable-payment versions change the payment when prime moves. Fixed-payment versions keep the payment steady and send more of it to interest and less to principal, so the balance shrinks more slowly. Under the contract, the lender can eventually require a higher payment or another adjustment if interest takes up too much of it.

That gives you three groups to sort your own borrowing into: costs that can change now, such as prime-linked lines of credit and adjustable-payment mortgages; costs absorbed inside an unchanged payment, such as fixed-payment variable mortgages; and costs that wait for renewal, such as fixed mortgages. Your contract for each debt tells you which group it belongs in.

What changes when your fixed mortgage renews, and how higher rates slow spending

The fixed mortgage that seemed untouched has a date printed on it. New fixed-rate offers and renewal rates are priced off bond yields, lenders' funding costs and each lender's own pricing. Those can move before, after or independently of a Bank of Canada announcement, which means a payment that hasn't changed today says little about what the next term will cost.

So find your renewal date and work out the payment at more than one possible rate: your current rate, then a point or two higher. If the higher figure would squeeze the household budget, it's far better to learn that while you still have months to adjust spending, build savings or pay down the line of credit.

The staggered timing is how the policy is meant to work. As interest takes a bigger share of each month's cash, less is left for discretionary spending, and better returns on savings make putting off a purchase more appealing. Households pull back a little at a time, demand cools, and inflation eases toward the Bank's 2% target. Easing inflation means prices rise more slowly; it doesn't mean they generally fall. For you, the renovation, the vehicle or the investment contribution you've planned is now competing with the interest line for the same dollars.

A steady mortgage payment doesn't prove your household is unaffected, and a rate-hike headline doesn't mean every payment rises tomorrow. The confidence comes from knowing your timing, which no forecast can give you. This week, open the borrowing statement whose rate terms you're least sure about and find the line that says what can change, and when.