Canadian Mortgage Payment Calculator
Semi-annual compounding, the convention Canadian lenders follow under the Interest Act.
Method: show the math4 steps
| Step | Amount |
|---|---|
| Periodic rate (semi-annual compounding): (1 + 4.31/200)^(2/12) − 1 = 0.355983% Source | $4,343.68 |
| Monthly payment over a 25-year amortization (300 payments) | $4,343.68 |
| Annual payment (periodic × payments-per-year) | $52,124.12 |
| Total interest paid over 25-year amortization | $503,103.00 |
| Total | $4,343.68 |
Computed from the BC Real Estate Codex · CC BY 4.0
Notes: estimate only, and what this does not consider
Estimate only. Confirm with a licensed professional before relying on this number.
$4,343.68
Paid monthly, the payment clears a $800,000 mortgage at 4.31% over 25 years.
- Annual payment
- $52,124
- Total interest over 25-year amortization
- $503,103
- Total cost of mortgage (principal + interest)
- $1,303,103
- Year-5 snapshot: principal remaining
- $700,144
- Year-5 snapshot: interest paid through year 5
- $160,764
Try a typical scenario
Where this fits in your buying journey
- 1AffordabilityWhat you can buy
- 2PTTTransfer tax
- 3Cash-to-CloseClosing day cash
- 4MortgageMonthly payment
How semi-annual compounding works
Section 6 of the Interest Act (RSC 1985, c. I-15) requires a mortgage with blended payments to state its rate calculated yearly or half-yearly, not in advance. Lenders therefore quote fixed rates compounded semi-annually, and work out the monthly or bi-weekly rate as the equivalent rate that, compounded semi-annually, yields the quoted nominal rate.
At a 5.5% nominal rate, the periodic monthly rate is approximately 0.4532% (semi-annual compounding). On an $800,000 mortgage over 25 years that periodic rate produces a monthly principal-and-interest payment of about $4,883.
Variable-rate mortgages are often compounded monthly because the rate floats. This calculator uses semi-annual compounding for every rate.
The rate you pay versus the rate you qualify at
The contract rate above is the rate you pay. The federal mortgage stress test (OSFI Guideline B-20 mortgage stress test) qualifies you at a higher rate, the greater of your contract rate plus 2 percentage points or 5.25%. To see what mortgage size that translates to against your income, use the what you can afford calculator.
Common questions about Canadian mortgage payments
What is semi-annual compounding and why does Canada use it?
Section 6 of the Interest Act (RSC 1985, c. I-15) requires a mortgage with blended payments to state its rate calculated yearly or half-yearly, not in advance. Lenders therefore quote fixed rates compounded semi-annually. The periodic monthly or bi-weekly rate is derived from that figure, so monthly payments compute against a slightly lower periodic rate than a US-style monthly-compounded mortgage at the same nominal rate. Source: Interest Act, section 6.What's the difference between monthly, bi-weekly, and accelerated bi-weekly?
Monthly = 12 payments per year. Bi-weekly = 26 payments per year, each equal to (monthly × 12) ÷ 26, same total annual payment, just split differently. Accelerated bi-weekly = 26 payments per year, each equal to (monthly ÷ 2), that's 13 monthly-equivalent payments per year instead of 12, which shortens the amortization by about 3 to 4 years on a 25-year mortgage (about 3.7 years at 5.5%).Can I get a 30-year amortization?
Effective Dec 15, 2024, 30-year amortization on an insured mortgage (less than 20% down) is restricted to first-time buyers OR any buyer of newly-constructed housing. Conventional buyers (20%+ down) can amortize over 30 years regardless of status, since the deal isn't insured. Some credit unions also offer 35-year amortization on conventional mortgages, use the Custom amortization option to model that scenario.What happens to my payment at renewal?
Canadian mortgages typically have terms of 1–5 years; at the end of the term, the rate resets to whatever the market is at that point. The year-5 snapshot above shows your principal remaining at renewal, that's the amount you'll re-amortize at the new rate. Source: your mortgage contract and your lender’s renewal letter.Why does my lender quote a different rate from the one I qualify at?
Two different rates. The contract rate is what you pay month to month. The qualifying rate (the OSFI B-20 stress test) is what the lender uses to size your pre-approval, the greater of (contract rate + 2 percentage points) or 5.25%, whichever is higher. To see what mortgage size that qualifies for under your income, use the affordability calculator.Is this a mortgage pre-approval?
No. This calculator estimates the periodic payment on a known principal at a known rate. A pre-approval verifies your income, credit, down-payment source, and ability to qualify under your lender's specific rules (which may differ slightly from the standard OSFI / CMHC convention). Talk to a licensed mortgage broker for an actual approval.
Sources(3)
Also drawn from: Office of the Superintendent of Financial Institutions, Canada Mortgage and Housing Corporation, Government of Canada.
- Guideline B-20: Residential Mortgage Underwriting Practices and ProceduresOSFI, retrieved Nov 6, 2026
- Minimum qualifying rate for uninsured mortgages: "The greater of the mortgage contract rate plus 2% or 5.25%"Office of the Superintendent of Financial Institutions, retrieved Nov 6, 2026
- osfi.b20.stress_test, v2, in the Codex
- Government Announces Boldest Mortgage Reforms in DecadesGovernment of Canada, retrieved Nov 4, 2026
- cmhc.amortization_30yr_eligibility, v1, in the Codex
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Bronson Job PREC, REALTOR® at Momentum Realty Inc.. GVR Member #6015742 · FVREB Member #FJOBBR
Last reviewed by Bronson Job PREC, REALTOR®. Licence CC BY 4.0. How we verify.