Canadian mortgage math

Mortgage Payment Calculator (Canada)

Your mortgage payment with Canadian semi-annual compounding, CMHC insurance on under-20% down payments, the 30-year amortization surcharge, and Ontario's tax on the premium.

Rules and rates as of October 2026

= $150,000

Estimated payment

$3,321

per month

Down payment
$150,000
Mortgage amount
$600,000
Total interest
$396,251

Total interest assumes today's rate for the whole amortization.

Estimates only, based on the rules in effect in October 2026; not legal, tax or financial advice. Your agreement of purchase and sale, lender and lawyer have the final numbers.

Why Canadian mortgage math is different

The Interest Act requires fixed-rate mortgages to state their rate compounded semi-annually. A 4.5% mortgage is really 2.25% every six months, which works out to about 0.371% a month rather than 0.375%. US calculators skip this and overstate the payment slightly; this one doesn't.

With less than 20% down, the mortgage must be insured (CMHC, Sagen or Canada Guaranty) and the premium is added to the loan. It's charged on the whole mortgage, so moving from 10% to 15% down lowers both the loan and the premium rate.

Mortgage insurance premiums

Down paymentPremium (25 years)Premium (30 years)
5% to 9.99%4.00%4.20%
10% to 14.99%3.10%3.30%
15% to 19.99%2.80%3.00%
20% or moreNo insurance required

Insured mortgages are available on homes under $1.5 million. In Ontario, 8% PST on the premium is due in cash on closing.

Buying pre-construction?

You won't need the mortgage until closing, often years away, and you'll qualify at the rates of the day. Map your deposit schedule, budget for closing costs, and run this calculator at a rate a point or two higher to see how much room you have.

Frequently asked questions

How are Canadian mortgage payments calculated?

Canadian fixed-rate mortgages compound semi-annually by law, not monthly, so the effective monthly rate is a little lower than the annual rate divided by twelve. This calculator uses that convention: $600,000 at 4.5% over 25 years is about $3,321 a month.

What is the minimum down payment in Canada?

5% of the first $500,000 and 10% of the part above it, for homes under $1.5 million. At $1.5 million and up the mortgage can't be insured, so lenders require at least 20%. On a new build, the deposits you paid during construction count toward the down payment.

How much is CMHC mortgage insurance?

With less than 20% down the mortgage must be insured. The premium is a percentage of the loan: 4.00% with 5% to 9.99% down, 3.10% with 10% to 14.99%, and 2.80% with 15% to 19.99%, plus 0.20% for an amortization over 25 years. It's added to the mortgage, but Ontario's 8% sales tax on it is paid in cash on closing.

Who can get a 30-year amortization?

With an insured mortgage (under 20% down), 30-year amortizations are available to first-time buyers and to anyone buying a newly built home, since December 15, 2024. With 20% or more down, lenders commonly offer 30 years to any buyer. A longer amortization lowers the payment but adds a lot of interest.

Is accelerated bi-weekly worth it?

Accelerated bi-weekly payments are half the monthly payment every two weeks, which adds up to one extra monthly payment a year. That goes straight to principal, so the mortgage is paid off years sooner and the total interest drops, as the calculator shows. Plain bi-weekly payments don't have that effect.

Will I qualify at this payment?

Lenders qualify you at a higher stress-test rate: currently the greater of your contract rate plus 2% or 5.25%. Your housing costs and other debts must fit their debt-service limits at that rate. For a pre-construction home, you qualify again close to closing, at the rates of the day.

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