About the Canadian mortgage
A Canadian mortgage is a registered charge against real property, advanced by a federally regulated lender (a Schedule I or II bank), provincially regulated credit union, or alternative lender. Three structural features make it different from a US mortgage:
- Short fixed terms inside long amortizations: most borrowers sign a 5-year fixed term inside a 25 or 30-year amortization. At the end of the term you renew at the prevailing rate.
- Semi-annual compounding by statute: section 6 of the Interest Act of Canada requires interest to be calculated no more frequently than semi-annually for closed mortgages. The effective monthly rate is slightly lower than dividing the posted annual rate by 12.
- Stress test: Office of the Superintendent of Financial Institutions (OSFI) Guideline B-20 requires lenders to qualify borrowers at the greater of the contract rate plus 2 percent or the 5.25 percent benchmark floor.
How the Canadian mortgage calculator works
The base payment formula is the standard amortization equation, but the monthly periodic rate is derived from a semi-annual compounding adjustment.
i_eff_month = (1 + nominal_rate / 2)^(1/6) - 1
PMT = P x i_eff_month / (1 - (1 + i_eff_month)^-n)
Stress-test qualifying rate
= max(contract rate + 2%, 5.25%)
GDS = (PMT + property tax + heat + 50% of condo fees) / gross income, max 39%
TDS = (GDS payments + other debt service) / gross income, max 44%
CMHC premium (added to balance)
5 to 9.99% down -> 3.10% of loan
10 to 14.99% down -> 2.40% of loan
15 to 19.99% down -> 1.70% of loan
20% or more -> none (uninsured)
Worked example expanded: monthly cost over 5 years
Using the Toronto example above: 540,000 CAD insured at 5.5 percent over 25-year amortization with a 5-year fixed term, the 60-month picture looks like this.
| Item | Amount | Note |
|---|---|---|
| Monthly payment | 3,398 CAD | Same payment for all 60 months of the term |
| Interest paid year 1 | 30,196 CAD | About 74% of year-1 payments |
| Principal paid year 1 | 10,580 CAD | Builds slowly under semi-annual compounding |
| Balance at end of 5-yr term | 495,690 CAD | Equity built over the term: 61,050 CAD |
| Total paid over 5 years | 203,880 CAD | Of which 142,830 CAD is interest |
| Renewal exposure | 495,690 CAD | At the end of year 5 you renew at then-current rates |
Result. The borrower pays roughly 3,398 CAD per month, builds 61,050 CAD in equity over 5 years, and renews 495,690 CAD at then-current rates in year 6. If rates rise to 7 percent at renewal, the new monthly payment jumps to roughly 3,940 CAD, exactly the scenario the stress test was designed to anticipate.
Canadian mortgage 2026 key numbers
| Item | 2026 value | Source |
|---|---|---|
| Stress-test floor | 5.25% | OSFI B-20 |
| Stress-test buffer over contract | +2.00% | OSFI B-20 |
| Compounding frequency | Semi-annual | Interest Act of Canada s.6 |
| Minimum down (under 500k home) | 5% | CMHC |
| Minimum down (500k to 1.5M home) | 5% on first 500k, 10% on rest | CMHC, 2024 update |
| Insurability cap (home price) | 1.5 million CAD | Raised from 1 million on 15 Dec 2024 |
| Maximum amortization (insured, first-time) | 30 years | Effective 1 Dec 2024 for first-time buyers |
| Maximum amortization (insured, repeat) | 25 years | Long-standing CMHC rule |
| GDS limit | 39% | CMHC and Sagen guidelines |
| TDS limit | 44% | CMHC and Sagen guidelines |
| CMHC premium (10% down) | 3.10% of loan | CMHC 2024 rate card |
How Canadian and other major mortgages compare
| Feature | Canada | United States | United Kingdom |
|---|---|---|---|
| Typical fixed-rate term | 5 years (max 10) | 30 years | 2 or 5 years |
| Typical amortization | 25 or 30 years | 30 years | 25 to 35 years |
| Renewal risk | Yes, every 5 years | No (full-term lock) | Yes, every 2 to 5 years |
| Compounding | Semi-annual | Monthly | Daily or monthly |
| Mortgage interest deduction | No (primary residence) | Yes (capped) | No (primary residence) |
| Default insurance threshold | Below 20% down | Below 20% down (PMI) | n/a (lender's discretion) |
| Prepayment privilege | 10 to 20% per year | Unlimited (typically) | 10% per year typical |
Common Canadian mortgage pitfalls
- Forgetting the stress test still applies to uninsured mortgages. Since 2018 OSFI extended B-20 to all federally regulated lenders, not just sub-20-percent borrowers. The qualifying rate hits everyone.
- Mistaking the 5-year fixed for a 5-year loan. The term is 5 years, the amortization is 25 or 30. At end of term you renew, you do not own the home.
- Underestimating renewal risk. A borrower who signed a 1.75 percent 5-year fixed in 2021 is renewing into roughly 4.50 to 5.00 percent in 2026. Payments often rise 25 to 40 percent at renewal.
- Treating posted rates as offered rates. Bank-posted rates are typically 0.50 to 1.50 percent above the actual discounted offer. Always negotiate or use a broker.
- Triggering an IRD penalty by breaking a fixed term early. The interest-rate differential can be 10,000 to 25,000 CAD on a 500,000 mortgage if you break a high-rate fixed mid-term.
- Ignoring the 20 percent threshold. A 19 percent down payment incurs a 1.70 percent CMHC premium (about 8,500 CAD on a 500,000 loan). A 20 percent down payment avoids it entirely.
When to use the Canada mortgage calculator
- Affordability check before a pre-approval interview. Plug in the stress-test rate to see what a lender will actually approve.
- Renewal planning. Compare your existing 5-year fixed to current renewal offers from your broker and competitors.
- Down-payment threshold modeling. Test 19.99 percent versus 20 percent down to quantify the CMHC saving.
- Fixed-vs-variable comparison. Run a 5-year fixed against a Prime-minus-X variable using the current Bank of Canada policy rate.
Related calculators and country variants
Frequently asked questions about Canadian mortgages
What is the Canadian mortgage stress test in 2026?
The federal stress test (OSFI Guideline B-20) requires all federally regulated lenders to qualify borrowers at the greater of the contract rate plus 2 percent or 5.25 percent. The rule applies to both insured (less than 20 percent down) and uninsured mortgages.
How does Canadian semi-annual compounding work?
By statute, Canadian mortgages compound interest semi-annually rather than monthly. The effect is that a posted 5.50 percent rate has a monthly periodic rate of about 0.4532 percent, slightly less than the 0.4583 percent you would get from dividing 5.50 percent by 12. On a 500,000 CAD 25-year mortgage this saves roughly 50 to 80 CAD per month compared to US-style monthly compounding.
Is CMHC insurance refundable?
The CMHC premium is paid once at origination and rolled into the loan balance, and it is not refundable on resale or refinance. CMHC does offer a partial rebate of 10 to 25 percent on energy-efficient homes through the Eco Plus and Improvement programs.
What is the maximum amortization for a Canadian mortgage in 2026?
30 years for insured mortgages on a first-home purchase or for first-time buyers (effective 1 December 2024) and 35 years for uninsured mortgages from many lenders. The default 25-year amortization remains common because it is the historical insured ceiling for non-first-time buyers.
What is the CMHC premium for a 10 percent down payment in 2026?
3.10 percent of the loan amount for 5 to 9.99 percent down and 2.40 percent for 10 to 14.99 percent down. On a 540,000 CAD loan at 3.10 percent the premium is 16,740 CAD added to the loan balance.
How does a Canadian 5-year fixed differ from a US 30-year fixed mortgage?
In Canada, the typical fixed rate is locked for a 5-year term inside a 25 to 30-year amortization. At the end of the 5-year term you renew at the then-current rate. In the United States, a 30-year fixed locks the rate for the full amortization. Canadian borrowers therefore have more renewal risk but typically lower rates.
What is the GDS and TDS limit lenders use?
For insured mortgages the gross debt service ratio (housing payment plus property tax plus heat divided by gross income) is capped at 39 percent and the total debt service ratio (GDS plus all other debt payments) is capped at 44 percent. Lenders sometimes accept higher ratios on uninsured loans for strong credit profiles.
Can I prepay extra on a Canadian mortgage?
Yes, but the prepayment privilege is contractually limited. Most lenders allow 10 to 20 percent of the original balance per year plus a payment increase of 10 to 20 percent. Exceeding the privilege triggers an interest-rate differential (IRD) or 3-month interest penalty, which can run into thousands of dollars.
Sources
- Office of the Superintendent of Financial Institutions, Guideline B-20 Residential Mortgage Underwriting, current stress-test framework.
- CMHC, Mortgage Loan Insurance Premiums and Surcharges.
- Department of Finance Canada, 2024 mortgage rule changes, Increased insured price cap to 1.5M and 30-year amortization for first-time buyers, effective 15 Dec 2024 / 1 Dec 2024.
- Interest Act of Canada, R.S.C. 1985, c. I-15, section 6, semi-annual compounding requirement.
- Bank of Canada, current policy rate releases for variable-rate context.