Your Mortgage Rate Resets Every Five Years, Not in 25
A 47-year-old accountant in Oakville refinanced in March 2021 at 1.84% on a five-year fixed term. By March 2026, when that term expires, she will owe roughly $310,000 on a property she bought for $620,000. The rate she gets on that $310,000 will be whatever the market is offering that week, not the rate she locked in five years earlier. If the benchmark has climbed to 5.2%, her monthly payment jumps by $870. If it has fallen to 3.1%, she saves $340. The amortization, the 25-year clock ticking down to zero, does not reset. The rate does.
This is the structure most first-time buyers do not see coming. The confusion stems from conflating two separate timelines that govern every Canadian mortgage: the term and the amortization. The term is the length of the interest rate contract, almost always between one and five years. The amortization is the total number of years it would take to pay off the loan if nothing changed. For insured mortgages, where the down payment is under 20%, the maximum amortization is 25 years. For uninsured mortgages, it can stretch to 30. But the term is a separate, shorter countdown, and when it ends, the contract ends with it.
The Renewal Window Opens Every Few Years
At the end of a term, the borrower does not own the house free and clear. They still owe the remaining balance, and they must renew that balance into a new term at current market rates. A borrower with a 25-year amortization and a five-year term will renew four more times before the mortgage is paid off. Each renewal is a new contract. Each contract reflects the interest rate environment at that moment, not the environment from five years earlier.
This is structurally different from the United States, where 30-year fixed-rate mortgages are standard. In that system, locking in 3.5% in 2020 means paying 3.5% until 2050, regardless of what happens to rates. The Canadian system does not offer that. A five-year fixed rate is fixed for five years, then it expires. What many buyers interpret as "locking in" is actually "locking in for now."
The term structure creates a recurring negotiation point. At renewal, the borrower is not obligated to stay with their current lender. Switching costs nothing if done at the exact term end, because the new lender typically covers appraisal and discharge fees to win the business. The old lender knows this, which is why renewal letters often arrive with rates slightly above what a new applicant would get. The system assumes you will shop.
The Penalty Trap Lives Between Terms
Breaking a mortgage mid-term to switch lenders or refinance triggers a prepayment penalty, and for fixed-rate terms, that penalty is often calculated using the Interest Rate Differential. For a borrower two years into a five-year term at 2.1%, trying to refinance when rates have dropped to 1.6%, the penalty can run to $18,000 on a $400,000 balance. Wait until month 60, and the penalty is zero. The term end is the only clean exit.
This is why the term choice matters as much as the rate. A borrower who expects rates to fall might accept a higher rate on a two-year term rather than lock into a lower rate for five years, because the two-year term lets them re-enter the market sooner without penalty. The decision is a bet on timing as much as on cost.
Silence at Renewal is Expensive
If a borrower does nothing as a term expires, most banks auto-renew them into a six-month or one-year closed term at a rate well above market. This is not illegal. It is the default. The assumption is that engagement is the borrower's responsibility. A renewal letter is not an offer to negotiate. It is a notification that the current contract is ending and here is what happens if you do not act.
The structure is not hidden. It is in every mortgage agreement, explained at signing, printed on statements. What is missing is the visceral understanding that the 25-year timeline and the five-year contract are not the same object. The amortization is the horizon. The term is the road you are currently on, and every few years, that road ends.
