How does mortgage prepayment work in Canada?
**Mortgage prepayment means paying more than your scheduled payment amount, with the excess going directly to your principal balance.** Because interest is calculated on the outstanding principal each period, every dollar of prepayment reduces the interest charged on all future payments. This creates a compounding savings effect that grows over time.
Canadian lenders offer prepayment privileges that define how much extra you can pay each year without triggering a penalty. These privileges typically allow annual lump sum payments of 10% to 20% of the original mortgage principal, plus the ability to increase your regular payment by 10% to 20% above the original amount ([FCAC](https://www.canada.ca/en/financial-consumer-agency/services/mortgages/reduce-prepayment-penalties.html)).
There are three main prepayment strategies: increasing your regular payment amount, making annual lump sum payments, and making a one-time lump sum payment. This calculator lets you combine all three to see the maximum impact on your payoff date and total interest.
The calculator uses Canadian semi-annual compounding as required by the [Interest Act (RSC, 1985, c. I-15)](https://laws-lois.justice.gc.ca/eng/acts/i-15/FullText.html). This means your nominal annual rate compounds twice per year, not monthly, resulting in a slightly lower effective rate than monthly compounding at the same nominal rate.
What are prepayment privileges and how do they vary by lender?
**Prepayment privileges are the contractual terms in your mortgage agreement that define how much extra you can pay each year without penalty.** Every Canadian lender sets their own limits, and these terms are negotiable when you sign or renew your mortgage.
The two most common privilege types are lump sum payments (a one-time extra payment applied to principal) and payment increases (permanently raising your regular payment amount). Most lenders reset these privileges on your mortgage anniversary date, not on January 1.
For a $400,000 mortgage with a 15% annual lump sum privilege, you can prepay up to $60,000 per year without penalty. Unused privilege does not carry over to the next year. If you have $60,000 available in December and your anniversary is in January, you could potentially apply $60,000 before the anniversary and another $60,000 after, totaling $120,000 in two months.
Before making any large prepayment, review your mortgage contract or call your lender to confirm your specific limits. Exceeding the privilege on a closed fixed-rate mortgage triggers a penalty equal to the greater of three months' interest or the Interest Rate Differential (IRD). On a variable-rate mortgage, the penalty is typically three months' interest ([FCAC](https://www.canada.ca/en/financial-consumer-agency/services/mortgages/reduce-prepayment-penalties.html)).
| Lender Type | Typical Lump Sum Privilege | Typical Payment Increase |
|---|---|---|
| Big 5 Banks (TD, RBC, BMO, Scotiabank, CIBC) | 10% - 20% of original principal/year | 10% - 20% above original payment |
| Credit Unions | 10% - 25% of original principal/year | 10% - 25% above original payment |
| Monoline Lenders (MCAP, First National) | 15% - 20% of original principal/year | 15% - 20% above original payment |
| B-Lenders / Alternative | 5% - 15% of original principal/year | Varies widely |
Lump sum vs payment increase: which saves more interest?
**A lump sum payment saves more interest per dollar spent because the entire amount is applied to principal immediately, reducing the balance that accrues interest for all remaining periods.** A payment increase saves less per dollar because each extra dollar is spread across future payments, meaning earlier payments save more than later ones.
Consider a $400,000 mortgage at 5% over 25 years. A one-time $20,000 lump sum in Year 1 saves approximately $35,000 in total interest. Spreading that same $20,000 as an extra $67/month over 25 years saves approximately $22,000 in interest. The lump sum wins by $13,000 because the full $20,000 stops accruing interest immediately.
However, most homeowners do not have $20,000 available in a single lump sum. The optimal strategy for most Canadians is to combine both approaches: use payment increases for consistent ongoing savings (even $100/month makes a meaningful difference), and apply annual lump sums whenever you receive a bonus, tax refund, or inheritance.
The timing of your lump sum matters significantly. A $10,000 lump sum in Year 1 of a 25-year mortgage saves roughly twice as much interest as the same $10,000 lump sum in Year 10. This is because early prepayments benefit from more years of compounding savings.
How to avoid prepayment penalties in Canada
**The simplest way to avoid prepayment penalties is to stay within your annual prepayment privilege limits.** Track your prepayments throughout the year and know your anniversary date. Most lenders provide a prepayment tracker in online banking.
If you anticipate making large prepayments, negotiate higher privileges when you sign or renew your mortgage. A 20% privilege versus 10% doubles the amount you can prepay without penalty. Some lenders, particularly credit unions and monoline lenders, offer more generous terms than the Big 5 banks.
Variable-rate mortgages are significantly cheaper to break or prepay above privilege limits. The penalty is typically three months' interest (approximately $3,000 to $5,000 on a $400,000 balance at 5%). Fixed-rate penalties use the Interest Rate Differential (IRD), which can reach $15,000 to $25,000 or more if rates have dropped since you signed.
Open mortgages allow unlimited prepayment at any time but carry higher interest rates (typically 1% to 2% above closed rates). A convertible mortgage starts as open and can be converted to closed, giving you initial prepayment flexibility. If you plan to sell within 1 to 2 years or expect a large inheritance, an open or convertible mortgage may save money despite the higher rate.
At renewal time, you can pay off any amount, switch lenders, or renegotiate without penalty. If you are close to your renewal date and want to make a large prepayment, it may be worth waiting to avoid the penalty entirely.
How Canadian semi-annual compounding affects your payoff
**Canadian fixed-rate mortgages compound interest semi-annually (twice per year), not monthly, as required by the Interest Act.** This produces a lower effective rate than monthly compounding at the same nominal rate. A 5.00% nominal rate with semi-annual compounding yields an effective annual rate of 5.0625%, while monthly compounding would yield 5.1162%.
The conversion formula is: Effective Monthly Rate = (1 + Annual Rate / 2)^(1/6) - 1. For a 5.00% mortgage, the effective monthly rate is 0.4124%, compared to 0.4167% with monthly compounding. On a $400,000 mortgage over 25 years, this difference saves approximately $3,500 in total interest.
This calculator automatically applies Canadian semi-annual compounding to all calculations. When comparing your results to US-based calculators, note that a US 5% mortgage costs more in actual interest than a Canadian 5% mortgage because of this compounding difference.
Variable-rate mortgages in Canada compound monthly, not semi-annually. If you have a variable rate, the effective rate equals the nominal rate divided by 12, per period. This is a subtle but important distinction when comparing fixed vs variable mortgage costs.
Optimal prepayment strategies for Canadian homeowners
**The most effective strategy combines accelerated bi-weekly payments with annual lump sums applied as early in the mortgage as possible.** Accelerated bi-weekly payments alone save approximately 3 years and $30,000 on a $400,000 mortgage at 5% over 25 years, with no additional out-of-pocket cost beyond the regular payment amount.
Prioritize prepayment in the early years of your mortgage when the interest portion of each payment is highest. In Year 1 of a $400,000 mortgage at 5%, approximately 70% of each payment goes to interest. By Year 20, it flips to approximately 30% interest. Every dollar of prepayment in Year 1 prevents interest from accumulating for the next 24 years.
Use the "waterfall" approach: (1) Switch to accelerated bi-weekly payments (free, automatic), (2) increase your payment by the maximum allowed at each renewal, (3) apply tax refunds, bonuses, and windfalls as annual lump sums, (4) round up your payment to the nearest $100 for psychological ease.
Do not prepay your mortgage if you have higher-interest debt. Credit card debt at 20% should be eliminated before making extra mortgage payments at 5%. Similarly, if your employer matches RRSP contributions, maximizing the match produces a guaranteed 100% return, which far exceeds the 5% savings from mortgage prepayment.
- ✓Switch to accelerated bi-weekly payments for automatic savings at no extra cost
- ✓Apply lump sums early in the mortgage when interest savings are greatest
- ✓Maximize your prepayment privilege each year before the anniversary resets
- ✓Pay off high-interest debt (credit cards, personal loans) before prepaying your mortgage
- ✓Consider your marginal tax rate when choosing between RRSP contributions and mortgage prepayment
Worked example: how much does prepayment save?
**Scenario:** You have a $400,000 mortgage at 5.00% with 20 years remaining. Your monthly payment is $2,633. You want to see the impact of three prepayment strategies.
**Strategy 1: Extra $200/month.** Adding $200 per month to your payment saves approximately $38,000 in total interest and pays off the mortgage 3 years and 8 months early. Your new total interest drops from approximately $232,000 to $194,000.
**Strategy 2: $10,000 annual lump sum.** Applying $10,000 per year directly to principal saves approximately $68,000 in total interest and shortens the mortgage by 7+ years. The lump sum strategy saves significantly more than the payment increase because the full amount reduces principal immediately.
**Strategy 3: Both combined.** Extra $200/month plus $10,000 annual lump sum saves approximately $89,000 in interest and pays off the mortgage 9+ years early. Your 20-year mortgage becomes an 11-year mortgage.
**Key takeaway:** The combined strategy nearly cuts your mortgage in half. Even modest prepayments compound into substantial savings over time. Use the calculator above to model your specific scenario.
Frequently asked questions
How much can I prepay on my mortgage each year without penalty?
**Most Canadian lenders allow annual lump sum prepayments of 10% to 20% of the original mortgage principal, plus payment increases of 10% to 20%.** For example, on a $400,000 original mortgage with a 15% privilege, you can prepay up to $60,000 per year as a lump sum. Check your mortgage contract for your specific limits, as they vary by lender and product.
What is the penalty for exceeding my prepayment privilege?
**On a fixed-rate mortgage, the penalty is the greater of three months' interest or the Interest Rate Differential (IRD).** The IRD can be substantial if rates have dropped since you signed. On a variable-rate mortgage, the penalty is typically three months' interest. On a $400,000 balance at 5%, three months' interest is approximately $5,000.
Is it better to make a lump sum payment or increase my regular payment?
**A lump sum saves more interest per dollar because the full amount reduces principal immediately.** A $20,000 lump sum in Year 1 of a 25-year mortgage saves roughly 60% more interest than the same $20,000 spread as extra monthly payments. However, if you do not have a lump sum available, consistent payment increases are the next best option.
Should I prepay my mortgage or invest the money instead?
**If your mortgage rate is below your expected after-tax investment return, investing may produce higher net wealth.** At a 5% mortgage rate, you need investments returning above 5% after tax to come out ahead. However, mortgage prepayment provides a guaranteed, risk-free return equal to your mortgage rate. Many financial planners recommend a balanced approach: maximize RRSP matches first, then split extra funds between mortgage prepayment and investment.
When is the best time to make a lump sum payment?
**As early as possible in your mortgage term.** A $10,000 lump sum in Year 1 of a 25-year mortgage saves roughly twice the interest of the same payment in Year 10. The earlier you reduce principal, the more future interest you avoid. If your privilege resets on your anniversary date, apply your lump sum just after the reset to maximize the time it reduces your balance.
How do accelerated bi-weekly payments help pay off my mortgage faster?
**Accelerated bi-weekly takes half your monthly payment and collects it every two weeks (26 times per year), which equals 13 monthly payments instead of 12.** That extra payment goes entirely to principal. On a $400,000 mortgage at 5% over 25 years, this saves approximately $30,000 in interest and pays off the mortgage about 3 years early, with no additional out-of-pocket cost.
Does this calculator use Canadian semi-annual compounding?
**Yes, all calculations use Canadian semi-annual compounding as required by the Interest Act (RSC, 1985, c. I-15).** Your nominal annual rate is converted to an effective monthly rate using the formula: r_monthly = (1 + nominal/2)^(1/6) - 1. This produces slightly lower effective rates than US-style monthly compounding.
Can I combine multiple prepayment strategies?
**Yes, and combining strategies produces the largest savings.** The calculator lets you set an extra per-period payment, an annual lump sum, and a one-time lump sum simultaneously. A common combination is switching to accelerated bi-weekly payments, adding $100 to $200 per payment, and applying your annual tax refund as a lump sum.
What happens to my prepayment privilege at renewal?
**At mortgage renewal, you can pay any amount against your balance, switch lenders, or renegotiate without penalty.** Your prepayment privileges are renegotiated as part of the new term. If your current privileges are too restrictive, renewal is the ideal time to negotiate better terms.
How much does $100 extra per month save on a $300,000 mortgage?
**On a $300,000 mortgage at 5% over 25 years, an extra $100/month saves approximately $27,000 in interest and shortens the amortization by about 3 years.** At $200/month extra, the savings jump to approximately $46,000 and 5+ years off the mortgage. Even small amounts compound into substantial savings over the life of the loan.