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Canadian Mortgage Calculator
In Canada, mortgage interest is compounded semi‑annually by law (not monthly), which slightly changes your payment versus US‑style loans. Enter your price, down payment, rate and amortization to see your payment, total interest and schedule.
Estimate a Canadian mortgage payment with semi-annual compounding, taxes and carrying costs, land transfer tax, minimum down payment and GDS/TDS checks — plus a full amortization schedule. It also shows how monthly or one-off prepayments cut your interest and clear the mortgage sooner, so you can see the true cost of an Ontario or BC mortgage.
Canada estimate uses semi-annual mortgage compounding and CMHC-style minimum down payment rules checked for 2026. Exact lender qualification can differ.
Amortization schedule
How this Canadian mortgage calculator works
Canadian mortgage rates are commonly quoted with semi-annual compounding. This calculator converts the annual rate into an effective monthly rate using (1 + rate / 2)^(1 / 6) - 1, then applies the standard mortgage payment formula.
The Canadian mortgage formula
Because Canadian fixed rates compound semi-annually, the quoted annual rate is first converted to an effective monthly rate:
That monthly rate then goes into the standard amortization formula:
- M — monthly mortgage payment
- P — loan amount (home price minus down payment)
- r — quoted annual interest rate (as a decimal, e.g. 0.05)
- i — effective monthly rate with semi-annual compounding
- n — number of payments = amortization years × 12
Note: many US mortgage calculators divide the annual rate by 12 instead, so a US and Canadian calculator can show slightly different payments for the same rate. In a spreadsheet, the effective monthly rate is =(1+r/2)^(1/6)-1, then =PMT(that_rate, n, -loan).
Below a 20% down payment, Canadian buyers generally need mortgage default (CMHC) insurance — you can add its annual cost in the optional fields. The calculator also checks the common minimum down payment rule for homes below C$1.5 million: 5% of the first C$500,000 plus 10% of the amount above C$500,000, and folds provincial and Toronto land transfer tax into your cash needed to close.
Monthly payment by mortgage amount
Roughly what common loan amounts cost per month at a 5% rate over a 25‑year amortization, using Canadian semi‑annual compounding (principal and interest only). Enter your own price, down payment, rate and amortization above for an exact figure.
| Loan amount | Monthly payment | Total interest |
|---|---|---|
| C$300,000 | C$1,744.81 | C$223,444 |
| C$400,000 | C$2,326.42 | C$297,926 |
| C$500,000 | C$2,908.02 | C$372,407 |
| C$600,000 | C$3,489.63 | C$446,889 |
| C$800,000 | C$4,652.84 | C$595,852 |
GDS and TDS affordability
GDS looks at the share of gross income used for housing costs. TDS adds other monthly debt payments on top. The result panel flags the common 39% GDS and 44% TDS guideline levels, but lenders can apply different stress-test rates, exceptions and documentation rules.
Land transfer tax
Most Canadian provinces charge a land transfer tax when you buy, paid in cash at closing on top of your down payment. Rates are marginal and vary by region: Ontario and British Columbia use their own brackets, and a home in the City of Toronto pays an additional municipal land transfer tax on top of the provincial one. First-time buyers may qualify for a rebate — up to C$4,000 in Ontario, up to C$4,475 on the Toronto municipal portion, and a full or partial exemption in BC on lower-priced homes. Alberta and Saskatchewan charge only small registration fees rather than a land transfer tax. Choose your province and first-time-buyer status above to fold the estimated tax into your upfront cash.
Estimates only — not financial, mortgage or tax advice.
How to use it & key terms
Enter the home price, down payment, rate and amortization, then press Calculate for your payment worked out with Canadian semi-annual compounding.
| Term | What it means |
|---|---|
| Down payment | Your upfront amount; under 20% triggers CMHC insurance. |
| CMHC insurance | Mortgage default insurance required with less than 20% down. |
| Amortization | The total years to repay (often 25); longer lowers payments but adds interest. |
| Term | The length of your current rate contract (e.g. 5 years), shorter than the amortization. |
| Semi-annual compounding | The Canadian convention for how mortgage interest is compounded. |
| GDS / TDS | Debt-service ratios lenders use to judge affordability. |
What makes a Canadian mortgage different
A Canadian mortgage behaves differently from a US one in ways that change the math. By law, fixed-rate mortgages are quoted with semi-annual compounding rather than the monthly compounding common in the United States, so the effective cost of a stated rate is slightly lower — this calculator already applies the semi-annual convention. Loans are also split between a long amortization (often 25 years) and a much shorter term (frequently five years), after which you renew at whatever rates prevail. That renewal is the moment a payment can jump, which is why Canadians watch rates closely as a term ends.
Two more features shape affordability. Borrowers generally must qualify at a higher “stress test” rate than their actual contract rate, proving they could still pay if rates rose. And when the down payment is under 20%, mortgage default insurance (through CMHC or a private insurer) is normally required, adding a premium that is usually folded into the loan. Both rules mean the mortgage you qualify for can be smaller than the raw payment math alone suggests.
Sources & methodology
Because Canadian fixed-rate mortgages are compounded semi-annually, we convert your quoted annual rate to an effective monthly rate — (1 + rate ÷ 2)^(1/6) − 1 — before applying the amortization formula. We also estimate CMHC-style minimum down-payment rules, provincial and Toronto land transfer tax, and GDS/TDS affordability ratios.
Sources: Semi-annual compounding convention under Canada's Interest Act; provincial land transfer tax schedules; CMHC minimum down-payment guidelines.
Open, closed, and the cost of breaking a Canadian mortgage
Beyond the compounding and renewal rules, one of the most practical choices a Canadian borrower makes is between an open and a closed mortgage — a distinction that barely exists in the same form south of the border. A closed mortgage carries a lower interest rate but limits how much extra you can pay and charges a penalty if you break it before the term ends. An open mortgage lets you repay any amount, or the whole balance, at any time without penalty, but you pay for that freedom with a noticeably higher rate. Most people choose closed and simply use the flexibility built into it.
That built-in flexibility is the prepayment privilege. Even a closed mortgage usually lets you pay down a set share of the original balance each year as a lump sum, and often to raise your regular payment by a set percentage as well. Used deliberately, these privileges let you attack the principal faster without triggering any penalty — the schedule above shows how even modest lump sums early in the amortization ripple into large interest savings over a 25-year loan.
The penalty matters most when life forces an early exit — selling, refinancing, or breaking the term. For a variable-rate mortgage the charge is typically three months' interest, which is usually manageable. For a fixed-rate mortgage it is often the greater of three months' interest or the interest rate differential, a calculation that compares your rate against current rates and can be surprisingly large when rates have fallen since you signed. This is why the length of term you choose is not only about the rate — it is a commitment you may have to buy your way out of.
A related feature softens that risk: many Canadian mortgages are portable, meaning you can carry your existing rate and terms to a new home if you move mid-term, avoiding a penalty altogether. Before locking in, it is worth weighing how likely you are to move, refinance, or come into extra cash, and matching the term and mortgage type to that plan. The payment math above tells you what you will pay; the open-versus-closed decision tells you how much freedom you are keeping while you pay it.
Frequently asked questions
How is a Canadian mortgage payment calculated?
Canadian fixed mortgage payments commonly convert the quoted annual rate with semi-annual compounding into an effective monthly rate, then apply the amortization formula across the selected amortization period.
Why is Canada different from a US mortgage calculator?
The key math difference is compounding. Many US calculators use a simple APR divided by 12, while Canadian mortgage quotes are commonly based on semi-annual compounding.
When is CMHC mortgage insurance required?
Mortgage default insurance is generally required in Canada when the down payment is below 20 percent, subject to eligibility rules such as purchase price and amortization limits.
What is a high-ratio mortgage in Canada?
A high-ratio mortgage is one where your down payment is under 20% of the purchase price, so you borrow more than 80% of the home’s value. These require mortgage default insurance such as CMHC, added to your balance. With 20% or more down it’s a conventional (low-ratio) mortgage with no insurance needed.
What is the minimum down payment in Canada?
For many owner-occupied purchases below C$1.5 million, the minimum is 5% of the first C$500,000 plus 10% of the portion above C$500,000.
What are GDS and TDS ratios?
GDS compares housing costs with gross income. TDS includes housing costs plus other monthly debt payments. They are common affordability checks used by Canadian lenders.
How much can I save by prepaying my mortgage in Canada?
Extra monthly prepayments or a one-off lump sum go straight to the principal, so you pay less interest and clear the mortgage sooner. Enter a monthly or one-time prepayment and the calculator shows the exact interest saved and how much earlier the mortgage is paid off. Check your lender’s annual prepayment privileges first, as exceeding them can trigger a penalty.
Are these results a mortgage approval?
No. The calculator is an estimate. A lender or broker must confirm your qualifying rate, documents, exact insurance premium, debts, property taxes and approval conditions.