Most people know their monthly mortgage payment to the dollar but couldn't say where that money actually goes. Understanding the mechanics — especially the parts unique to Canada — can save you tens of thousands of dollars over the life of a mortgage.
Term vs. Amortization: Canada's Two Clocks
Canadian mortgages run on two timelines, and mixing them up is the most common point of confusion:
- Amortization period — the total time to pay the loan to zero, commonly 25 years.
- Term — the length of your current contract with your lender, commonly 5 years. When it ends, you renew at whatever rates look like then.
This is very different from the US, where a 30-year fixed rate really is locked for 30 years. A Canadian borrower with a 25-year amortization will typically renegotiate their rate four or five times — which is why rate changes hit Canadian households faster.
Where Each Payment Goes
Every payment splits between interest (the cost of borrowing this month) and principal (actually paying down the loan). Early on, the balance is large, so interest eats most of the payment. On a $500,000 mortgage at 5% amortized over 25 years, the payment is about $2,908 — and in month one, roughly $2,060 of it is interest.
The split improves slowly. It can take well over a decade before most of your payment is going to principal. This is why moving or refinancing every few years quietly resets you into the expensive, interest-heavy zone.
The Prepayment Shortcut
Anything extra you pay goes 100% to principal — permanently shrinking the balance every future interest charge is computed on. Even modest moves compound dramatically:
- Accelerated biweekly payments (half your monthly payment every two weeks) sneak in one extra monthly payment per year and typically knock 3–4 years off a 25-year amortization.
- Annual lump sums — most Canadian lenders allow 10–20% of the original principal per year penalty-free.
Payments, interest, and amortization for any rate
A Note on Compounding
By law, Canadian fixed-rate mortgages compound semi-annually, not monthly — a quirk that makes the effective rate slightly lower than the same nominal rate compounded monthly. Online calculators (ours included) typically use monthly compounding, so treat results as close estimates and your lender's quote as the final word.
The Takeaway
Run your own numbers before your next renewal: even a 0.25% rate difference on a large balance is real money over a 5-year term, and a small recurring prepayment beats almost any other guaranteed "investment" at today's rates.