Paying off your mortgage faster than required saves you tens of thousands of dollars in interest over time. But how you do it matters enormously. Use your prepayment privileges wisely and you pay nothing extra. Exceed them — or break your mortgage — and you face significant penalties. Here's what every Canadian homeowner needs to know.
Prepayment privileges are the terms your mortgage contract allows you to pay down the principal beyond your regular scheduled payments, without triggering a penalty. They are a feature of your mortgage — not a right — and the specifics vary by lender.
Standard prepayment privileges typically include:
Every extra dollar you put toward your principal directly reduces the balance that interest accrues on. Because mortgages are front-loaded with interest (especially in the early years), even modest lump sum payments early in the amortization can have dramatic long-term effects.
On a $500,000 mortgage at 4.5% with a 25-year amortization, a single $20,000 lump sum payment in year one reduces the total interest paid by approximately $35,000-40,000 over the life of the mortgage and cuts roughly 2 years off the amortization.
The penalty is 3 months of interest on the current balance. Straightforward and predictable. On $400,000 at 5%, that's approximately $5,000.
Fixed-rate penalties are calculated using the Interest Rate Differential (IRD) method. This compares your contract rate to the lender's current rate for a term closest to your remaining term, then charges you the difference on the outstanding balance.
The IRD formula (simplified): (Your rate − current comparison rate) × remaining balance × remaining months/12
For fixed-rate mortgages, lenders charge the greater of the IRD or 3 months interest. When interest rates have risen since you locked in, the IRD may actually be zero or very small (because your rate is below market). When rates have fallen, the IRD will typically be higher than 3 months interest.
| Rate Environment | Likely Penalty Type | Approximate Cost |
|---|---|---|
| Rates rose since you locked in | 3 months interest | Lower |
| Rates fell since you locked in | IRD | Can be very high |
| Variable rate mortgage | 3 months interest always | Predictable |
Switching from monthly to accelerated biweekly payments is one of the simplest ways to pay off your mortgage faster within your existing privileges. Accelerated biweekly means you make 26 half-payments per year instead of 12 full payments — effectively making one extra monthly payment per year. On a 25-year amortization, this typically cuts about 3 years off the mortgage with no fees and minimal impact on monthly cash flow.
Prepayment privileges and penalties vary significantly between lenders. When comparing mortgages, don't focus only on the rate. Compare:
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