Paying down your mortgage faster is one of the safest, most predictable “investments” a Canadian homeowner can make. Every extra dollar toward principal reduces the balance on which interest compounds — and Canadian mortgages compound semi-annually, meaning early-term extra payments have an outsized impact on your final interest cost.
How Canadian Mortgage Prepayment Privileges Work
Most Canadian mortgage contracts include prepayment privileges — the right to pay down principal faster without penalty, up to annual limits.
| Lender type | Typical lump-sum privilege | Typical payment increase privilege |
|---|---|---|
| Big 6 banks (standard) | 10–20% of original principal/year | 10–20% increase in regular payment |
| Monoline lenders | 15–20% | 15–20% |
| Credit unions | 10–20% | Varies |
| Private lenders | Often none | Often none |
Example: $600,000 original mortgage with a 15% prepayment privilege.
- Maximum extra lump sum per year: $600,000 × 15% = $90,000
- Payments above this trigger a prepayment penalty
Prepayment limits reset on your mortgage anniversary date — unused room does not carry forward.
How Much Can You Save With Extra Payments?
Example: $600,000 mortgage, 5.5% rate, 25-year amortization
| Strategy | Total interest paid | Amortization | Interest saved |
|---|---|---|---|
| Standard monthly payments | ~$570,000 | 25 years | — |
| Accelerated bi-weekly payments | ~$482,000 | ~22 years | ~$88,000 |
| $10,000 lump sum in year 1 | ~$541,000 | ~24 years | ~$29,000 |
| $25,000 lump sum in year 1 | ~$499,000 | ~23 years | ~$71,000 |
| 10% payment increase + accelerated bi-weekly | ~$410,000 | ~19 years | ~$160,000 |
These are estimates. Your exact savings depend on your interest rate, amortization, and when during the term you make extra payments.
Why Timing Matters
Extra payments made early in the amortization save the most. At the beginning of a 25-year mortgage, the vast majority of each payment covers interest, with little going to principal. An extra payment in year 1 reduces a high-interest balance; the same payment in year 20 reduces a much smaller balance with far less compounding left.
| Year of $10,000 extra payment | Approximate interest saved |
|---|---|
| Year 1 | ~$28,000–$30,000 |
| Year 5 | ~$20,000–$22,000 |
| Year 10 | ~$12,000–$14,000 |
| Year 15 | ~$6,000–$8,000 |
| Year 20 | ~$2,000–$3,000 |
(Estimates based on $600,000 mortgage at 5.5%, 25-year amortization)
Prepayment Strategies
1. Accelerated Bi-Weekly Payments
The simplest strategy: switch from monthly to accelerated bi-weekly payments.
| Payment type | Annual payment | Effect |
|---|---|---|
| Monthly ($3,600/month) | $43,200/year | Standard |
| Bi-weekly non-accelerated ($1,800 every 2 weeks) | $43,200/year | Same as monthly |
| Accelerated bi-weekly ($1,800 every 2 weeks) | $46,800/year | +$3,600/year to principal |
Accelerated bi-weekly means you make 26 payments of half your monthly amount — the equivalent of 13 months of payments per year. The extra month goes directly to principal, typically cutting 3–4 years off a 25-year amortization with no effort.
2. Annual Lump-Sum Payment
Apply a windfall (bonus, tax refund, inheritance) directly to principal. Most lenders allow this once per year on the anniversary date — though many allow it any time during the year up to the annual limit.
Best time to apply a lump sum: At the start of a new term (renewal), before the next interest calculation. The closer to the beginning of a term, the more interest is saved.
3. Increasing Your Regular Payment Amount
Most lenders allow you to permanently increase your payment by 10–25% without penalty. This is separate from the lump-sum privilege and can be done once per term or annually depending on the lender.
Example: Increase a $3,200/month payment by 15% = $480/month more to principal. Over a year, that’s an extra $5,760 — with compounding savings across the remaining amortization.
4. Double-Up Payments
Some lenders (particularly major banks) offer a “double-up” feature — the ability to double your regular payment on any scheduled payment date. The extra amount goes entirely to principal. This is flexible and does not count toward the annual lump-sum limit in all cases (verify with your lender).
Prepayment Penalties: What to Avoid
If you exceed your prepayment privileges, your lender will charge a penalty.
| Mortgage type | Penalty calculation |
|---|---|
| Fixed rate | Greater of: 3 months’ interest OR IRD (Interest Rate Differential) |
| Variable rate | 3 months’ interest only |
The Interest Rate Differential (IRD) penalty on fixed mortgages can be very large — sometimes $20,000–$50,000+ for mortgages with several years remaining at a rate significantly above current rates. Always calculate the IRD before making a large extra payment or breaking a fixed mortgage.
How to avoid penalties:
- Stay within annual prepayment limits
- Make extra payments on your anniversary date (some lenders are strict about timing)
- Keep written records of all extra payments made during the term
TFSA vs Mortgage Paydown: Quick Framework
| Your situation | Recommended priority |
|---|---|
| Have employer RRSP match available | Max the RRSP match first |
| TFSA room available, mortgage rate < 6% | Consider TFSA investing in a diversified ETF |
| Mortgage rate > 6% | Mortgage paydown competes strongly with investing |
| No investment knowledge or risk tolerance | Guaranteed savings via mortgage paydown |
| Close to renewal and want lower renewal amount | Lump sum before renewal reduces principal and interest |
How to Calculate Your Savings
To calculate your specific mortgage early payoff savings:
- Get your current outstanding balance
- Confirm your interest rate and remaining amortization
- Confirm your prepayment privileges (call your lender or check your mortgage agreement)
- Use the Mortgage Calculator Canada to compare scenarios
Inputs to compare:
- Scenario A: Standard remaining amortization
- Scenario B: With $X extra per year applied to principal
The difference in total interest paid is your saving.
Related Guides
- TFSA vs Mortgage Paydown
- Mortgage Payment Frequency Guide
- Monthly Carrying Costs for Homeowners
- Early Mortgage Renewal Guide
- Mortgage Refinancing Options
- Mortgage Calculator Canada
Sources
- Financial Consumer Agency of Canada. “Prepaying your mortgage.” canada.ca/en/financial-consumer-agency
- Bank of Canada. “Compound interest and mortgages.” bankofcanada.ca
- Office of the Superintendent of Financial Institutions. “Residential mortgage underwriting practices.” osfi-bsif.gc.ca