How is a Canadian mortgage payment calculated?
**A Canadian mortgage payment is calculated using semi-annual compounding, which is 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 stated annual rate compounds twice per year, not monthly. A 5% mortgage in Canada carries an effective annual rate of 5.0625%.
The formula converts your nominal rate to an effective monthly rate: r_monthly = (1 + nominal/2)^(1/6) - 1. Then it applies the standard **amortization formula**: Payment = (r_monthly x Principal) / (1 - (1 + r_monthly)^(-n)), where n is the total number of months in your amortization period.
This semi-annual compounding is unique to Canada. In the United States, mortgages compound monthly, producing slightly higher effective rates for the same nominal rate. A 5% mortgage in the US costs more in actual interest than a 5% mortgage in Canada because of this difference.
The mortgage payment calculator above applies this Canadian-specific formula after accounting for your down payment and CMHC mortgage insurance (if required). It then generates a year-by-year amortization schedule showing how each payment splits between principal and interest over time.
When is CMHC mortgage insurance required and how much does it cost?
**CMHC mortgage insurance is mandatory when your down payment is less than 20% of the home price, and the property costs $1,500,000 or less ([CMHC](https://www.cmhc-schl.gc.ca/consumers/home-buying/mortgage-loan-insurance-for-consumers/cmhc-mortgage-loan-insurance-cost)).** The premium is calculated as a percentage of your mortgage amount and can be added to your loan balance.
Premium rates increase as your down payment decreases. With 15-19.99% down, the premium is 2.80% of your mortgage. With 10-14.99% down, it rises to 3.10%. With the minimum 5-9.99% down, the premium reaches 4.00%. On a $475,000 mortgage (5% down on a $500,000 home), that 4.00% premium adds $19,000 to your loan.
The premium is typically added to your mortgage principal, which means you pay interest on it for the life of your loan. Provincial sales tax on the CMHC premium applies in Ontario (8% PST), Quebec (9.975% QST), and Saskatchewan (6% PST), and this tax cannot be added to the mortgage. You pay it out of pocket at closing.
| Down Payment | Loan-to-Value | Premium Rate |
|---|---|---|
| 5% - 9.99% | 90.01% - 95% | 4.00% |
| 10% - 14.99% | 85.01% - 90% | 3.10% |
| 15% - 19.99% | 80.01% - 85% | 2.80% |
| 20% - 24.99% | 75.01% - 80% | 2.40% |
| 25% - 34.99% | 65.01% - 75% | 1.70% |
| 35%+ | Up to 65% | 0.60% |
How do payment frequencies affect your total mortgage cost?
**Accelerated bi-weekly payments save the most interest because you make 26 half-payments per year instead of 12 full payments, which equals one extra monthly payment annually.** On a $400,000 mortgage at 5% over 25 years, switching from monthly to accelerated bi-weekly saves approximately $30,000 in interest and pays off the mortgage about 3 years early.
With monthly payments, you make 12 payments per year. With standard bi-weekly payments, the annual total is the same as monthly (your monthly payment x 12, divided into 26 installments). Standard bi-weekly does not save significant interest.
**Accelerated bi-weekly** takes your monthly payment, divides it by two, and collects that amount every two weeks. Because there are 26 bi-weekly periods in a year, you end up paying the equivalent of 13 monthly payments instead of 12. That extra payment goes entirely toward principal, which accelerates the amortization.
Weekly and accelerated weekly options work similarly. Accelerated weekly divides your monthly payment by four and collects it 52 times per year, equivalent to 13 monthly payments.
How much can you save with extra mortgage payments?
**Even $100 per month in extra payments on a $400,000 mortgage at 5% over 25 years saves approximately $27,000 in interest and shortens the amortization by over 3 years.** The earlier you start making extra payments, the greater the impact because you reduce the principal that accrues interest for the remaining years.
Most Canadian lenders allow annual prepayment privileges of 10% to 20% of the original mortgage principal. This means on a $400,000 mortgage, you can typically pay an additional $40,000 to $80,000 per year without penalty. You can also 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 ways to make extra payments: increase your regular payment amount, make annual lump-sum payments, or switch to accelerated bi-weekly payments. The mortgage payment calculator above models the impact of increasing your regular payment. Use the extra payment slider to see how much interest you save and how many years you cut from your amortization.
Before making large prepayments, check your mortgage contract for prepayment limits. Exceeding your annual privilege on a closed mortgage triggers a penalty. On a fixed-rate mortgage, the penalty is the greater of three months' interest or the Interest Rate Differential (IRD). On a variable-rate mortgage, the penalty is typically three months' interest.
What is the difference between amortization period and mortgage term?
**The amortization period is the total time to pay off the mortgage (typically 25 years). The mortgage term is the length of your rate contract (typically 5 years).** At the end of each term, you renew at the prevailing rate, which may be higher or lower than your current rate.
The standard maximum amortization in Canada is 25 years. Since December 15, 2024, first-time homebuyers and purchasers of newly constructed homes can qualify for 30-year amortization. Longer amortization reduces your monthly payment but increases total interest paid. A 30-year amortization on a $400,000 mortgage at 5% costs approximately $55,000 more in total interest than a 25-year amortization.
Mortgage terms in Canada range from 6 months to 10 years, with the 5-year fixed-rate term being the most common. At renewal, your remaining amortization decreases. If you started with 25 years and your first term was 5 years, your next term starts with a 20-year remaining amortization.
The distinction matters for the stress test. To qualify for an insured mortgage, your payments must be affordable at the greater of your contract rate plus 2% or the 5.25% floor rate, applied to the full amortization period ([OSFI](https://www.osfi-bsif.gc.ca/en/supervision/financial-institutions/banks/minimum-qualifying-rate-uninsured-mortgages)).
Worked example: calculating a mortgage payment in Canada
**Step 1: Enter the home price.** You are buying a home for $500,000 in Ontario.
**Step 2: Set your down payment.** You have $50,000 saved (10% of the purchase price). Because this is less than 20%, CMHC mortgage insurance is required.
**Step 3: Calculate CMHC insurance.** Your mortgage before insurance is $450,000. At a 10% down payment (90% LTV), the CMHC premium rate is 3.10%. Premium: $450,000 x 3.10% = $13,950. Your total mortgage becomes $463,950.
**Step 4: Set the interest rate and amortization.** You qualify for a 5-year fixed rate of 4.50% with a 25-year amortization (300 months).
**Step 5: Calculate the monthly rate using semi-annual compounding.** Effective annual rate: (1 + 0.045/2)^2 - 1 = 4.5506%. Monthly rate: (1.045506)^(1/12) - 1 = 0.3714%. This is lower than simply dividing 4.50% by 12 (0.375%), which is the US method.
**Step 6: Calculate the monthly payment.** Payment = (0.003714 x $463,950) / (1 - (1.003714)^(-300)) = $2,562 per month. Over 25 years, you pay $768,636 total, of which $304,686 is interest.
Frequently asked questions
How much is a mortgage payment on a $500,000 house in Canada?
**With 10% down ($50,000) at 4.50% over 25 years, your monthly payment is approximately $2,562.** This includes the CMHC insurance premium of $13,950 added to the mortgage. With 20% down ($100,000) at the same rate, the payment drops to approximately $2,209 because no CMHC insurance is needed and the principal is lower.
What is the minimum down payment for a house in Canada?
**The minimum is 5% for homes under $500,000.** For homes between $500,000 and $1,499,999, you need 5% of the first $500,000 plus 10% of the amount above $500,000. For example, a $700,000 home requires $25,000 + $20,000 = $45,000 minimum down (6.4%). Homes at $1,500,000 or above require a minimum 20% down payment.
How does semi-annual compounding affect my mortgage payment?
**Semi-annual compounding lowers your effective interest cost compared to monthly compounding at the same nominal rate.** A 5.00% mortgage in Canada has an effective annual rate of 5.0625%, while the same 5.00% rate in the US (monthly compounding) has an effective annual rate of 5.1162%. On a $400,000 mortgage over 25 years, this saves Canadian borrowers approximately $3,000 to $5,000 in total interest.
Is CMHC insurance added to my mortgage or paid separately?
**The insurance premium can be added to your mortgage principal, which most borrowers choose.** However, the provincial sales tax on the premium (8% in Ontario, 9.975% in Quebec, 6% in Saskatchewan) must be paid out of pocket at closing and cannot be added to the mortgage. On a $15,000 premium in Ontario, that means $1,200 in PST due at closing.
Should I choose a 25-year or 30-year amortization?
**A 25-year amortization costs less total interest, while a 30-year amortization lowers your monthly payment.** On a $400,000 mortgage at 5%, a 25-year amortization has a monthly payment of $2,326 and total interest of $297,870. A 30-year amortization has a payment of $2,132 (saving $194/month) but total interest of $367,627, costing $69,757 more over the life of the loan. The 30-year option is available only to first-time buyers and purchasers of new construction.
What happens to my mortgage payment when my term renews?
**Your payment is recalculated at the new interest rate based on your remaining balance and remaining amortization.** If rates have risen, your payment increases. On a $350,000 remaining balance with 20 years left, a 1% rate increase (from 4% to 5%) raises your monthly payment by approximately $190. This is why the stress test exists: it ensures you can afford payments at a higher rate.
What are the penalties for breaking a fixed-rate mortgage early?
**The penalty is the greater of three months' interest or the Interest Rate Differential (IRD).** Three months' interest on a $350,000 balance at 5% is approximately $4,375. The IRD compares your contract rate to the lender's current rate for the remaining term and applies the difference to your balance. The IRD penalty can be significantly higher, sometimes $10,000 to $20,000+, especially if rates have dropped since you signed ([FCAC](https://www.canada.ca/en/financial-consumer-agency/services/mortgages/reduce-prepayment-penalties.html)).
How much does accelerated bi-weekly save compared to monthly payments?
**Accelerated bi-weekly payments save approximately 3 years and $30,000 in interest on a typical $400,000 mortgage at 5% over 25 years.** You pay half your monthly payment every two weeks (26 payments/year), which equals 13 monthly payments instead of 12. That extra payment goes entirely toward principal.
What is the mortgage stress test in Canada?
**You must qualify at the greater of your contract rate plus 2%, or the 5.25% floor rate, to ensure you can handle future rate increases.** With the current best 5-year fixed rate around 3.75%, the stress test rate is 5.75% (3.75% + 2%). Your gross debt service (GDS) ratio cannot exceed 39%, and your total debt service (TDS) ratio cannot exceed 44% at the qualifying rate ([OSFI](https://www.osfi-bsif.gc.ca/en/supervision/financial-institutions/banks/minimum-qualifying-rate-uninsured-mortgages)).
Can I make a lump-sum payment on my mortgage without penalty?
**Most Canadian lenders allow annual prepayment privileges of 10% to 20% of the original mortgage principal without penalty.** On a $400,000 original mortgage, this means you can prepay $40,000 to $80,000 per year. Some lenders also allow payment increases of 10% to 20% above your original payment. Check your mortgage contract for your specific privilege terms. Unused prepayment privileges do not carry over to the next year.