SamCalculator

Canadian Mortgage Calculator

Calculate Canadian mortgage payments, amortization schedules, ownership costs, and mortgage payoff projections using Canadian mortgage rules and semi-annual compounding.

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Canadian minimum: 5% on first $500k, 10% on the portion to $1.5M, 20% above.

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Editorial Review

SamCalculator Editorial Team

Canadian mortgage math (semi-annual compounding, accelerated payment frequencies), CMHC premium tiers, and minimum down-payment rules on this page are cross-checked against the Canada Mortgage and Housing Corporation (CMHC), the Financial Consumer Agency of Canada (FCAC), and the Interest Act, s. 6 (R.S.C., 1985). This calculator is for education only and is not a substitute for advice from a licensed Canadian mortgage broker. Read our full Editorial Policy.

What Is a Canadian Mortgage?

A Canadian mortgage is a loan secured against residential property and issued by a federally regulated bank, credit union, or B-lender operating in Canada. Unlike most U.S. mortgages, Canadian fixed-rate mortgages use interest compounded semi-annually, not in advance — a convention rooted in section 6 of the federal Interest Act for long-term mortgages and adopted by lender practice for all residential fixed-rate loans.

This calculator models that convention exactly: the quoted annual rate is split in half, compounded semi-annually, and converted to the period rate that matches your chosen payment frequency. It also auto-calculates the CMHC mortgage default insurance premium when your down payment is below 20%.

How a Canadian Mortgage Works

Mortgage term vs amortization

Your mortgage term is the length of your contract with the lender — usually 1 to 10 years (5 is the Canadian default). Your amortization is how long it takes to pay the mortgage off in full — usually 25 or 30 years. You re-sign a new term at each renewal until amortization runs out.

Semi-annual compounding

A 5% Canadian mortgage actually charges (1 + 0.05/2)² − 1 = 5.0625% effective annually, lower than a US 5% mortgage that compounds monthly. The calculator handles this difference automatically.

Conventional vs high-ratio

20% or more down = conventional mortgage, no insurance required. Less than 20% = high-ratio mortgage, CMHC (or Sagen / Canada Guaranty) insurance is mandatory and the premium is added to your loan.

Federal stress test

All federally regulated Canadian mortgages must qualify at either the contract rate + 2% or 5.25%, whichever is higher. The calculator does not enforce qualification — confirm with your lender.

Canadian Minimum Down Payment

Canadian minimum down payment rules tier by purchase price. The calculator validates these automatically.

Purchase PriceMinimum DownCMHC Insurance
Up to $500,0005% of priceAvailable
$500,001 – $1,500,0005% on first $500k + 10% on restAvailable
Above $1,500,00020% of priceNot available

CMHC Mortgage Insurance Premiums

Required for high-ratio mortgages (down payment under 20%) on owner-occupied homes priced up to $1.5 million. The premium is calculated on the base loan amount and added to your mortgage by default. Rates below reflect the CMHC standard purchase schedule.

Down PaymentLTVPremium
5% to 9.99%90.01% – 95%4.00%
10% to 14.99%85.01% – 90%3.10%
15% to 19.99%80.01% – 85%2.80%
20% or more≤ 80%Not required

Sagen and Canada Guaranty offer comparable schedules. Some provinces (Ontario, Quebec, Saskatchewan) also apply provincial sales tax to the premium — that PST is paid in cash at closing and is not included in the financed amount above.

Core Formulas

The math behind the calculator. Canadian semi-annual compounding changes the period-rate formula compared to a U.S. mortgage but the payment formula itself stays the same.

Effective Period Rate (Canadian)

rp = (1 + j2/2)2/N − 1

Where j2 = quoted nominal annual rate, and N is the number of payments per year (12 monthly, 26 bi-weekly, 52 weekly).

Mortgage Payment

PMT = P · [ r(1 + r)n ] / [ (1 + r)n − 1 ]

Where P = total loan amount (base loan + CMHC premium), r = period rate from the formula above, and n = total number of payments (years × N).

Accelerated Payments

Accel-biweekly PMT = Monthly PMT ÷ 2; Accel-weekly PMT = Monthly PMT ÷ 4

Each year you make 26 accelerated bi-weekly (or 52 accelerated weekly) payments — equivalent to one extra monthly payment per year. That single extra payment typically shortens a 25-year mortgage by ~3–4 years.

Canadian Payment Frequencies

Monthly (12 / year)

The default for most Canadian mortgages. Each payment is the standard amortized PMT.

Bi-weekly (26 / year)

Each payment equals (monthly PMT × 12) ÷ 26. Total annual amount is exactly the same as monthly — no acceleration, just smoother cash flow with paychecks.

Accelerated Bi-Weekly (26 / year)

Each payment equals monthly PMT ÷ 2. 26 of those = 13 monthly payments per year — one extra monthly per year. Typically shortens a 25-year amortization by 3–4 years.

Weekly (52 / year)

Each payment equals (monthly PMT × 12) ÷ 52. Total annual is again identical to monthly. Useful only for cash-flow smoothing.

Accelerated Weekly (52 / year)

Each payment equals monthly PMT ÷ 4. 52 of those = 13 monthly payments per year, just like accelerated bi-weekly but spread tighter.

Common Canadian Mortgage Mistakes

  • Using U.S. monthly-compounded numbers

    A U.S. mortgage calculator with monthly compounding will slightly overstate your Canadian payment because monthly compounding produces a higher effective annual rate than semi-annual compounding.

  • Treating term as amortization

    A 5-year term does not mean your mortgage is paid off in 5 years. At the end of the term you renew at then-current rates and continue paying down the remaining balance over the rest of your amortization.

  • Skipping the stress test

    Even if you can afford the payment at today's rate, federally regulated lenders must qualify you at the contract rate + 2% or 5.25% — whichever is higher.

  • Forgetting CMHC PST

    Ontario, Quebec, and Saskatchewan charge provincial sales tax on the CMHC premium, payable in cash at closing. This tax is not financeable.

  • Confusing 'accelerated' with 'bi-weekly'

    Plain bi-weekly is just monthly split into smaller chunks — no interest savings. Accelerated bi-weekly is the one with the year-over-year payoff acceleration.

Practical Examples

First-Time Home Buyer

Toronto condo at $620,000, 5% down ($25,000 + $12,000 = $37,000), 25-year amortization, 5% rate, CMHC 4% premium adds $23,320 — base $583,000 becomes a $606,320 mortgage.

20% Down — Conventional

$800,000 detached home with $160,000 down. No CMHC required. Loan amount: $640,000. Monthly payment at 5% / 25 years: about $3,720.

Above $1.5M — Uninsured

$2,000,000 home, minimum 20% down = $400,000. CMHC unavailable, so the full $1,600,000 base loan is uninsured. Some lenders cap amortization at 30 years on uninsured.

Accelerated Bi-Weekly

Same $640,000 mortgage at 5% / 25 years: accelerated bi-weekly payment $1,860, paying off in approximately 22 years instead of 25 — saving over $50,000 in interest.

Trusted Sources & References

  1. CMHC — Canada Mortgage and Housing Corporation
  2. CMHC — Mortgage Loan Insurance Cost
  3. Financial Consumer Agency of Canada — Mortgages
  4. Government of Canada — Interest Act (R.S.C., 1985, c. I-15)

Frequently Asked Questions

Canadian mortgages use the standard amortization formula PMT = P × [r(1+r)^n] / [(1+r)^n − 1], where P is the total loan amount (base loan plus CMHC premium if any), r is the period interest rate, and n is the number of payments. The unique Canadian wrinkle is that r is derived from a semi-annual-compounded annual rate, not a monthly one: r = (1 + j/2)^(2/N) − 1, where j is the quoted annual rate and N is the number of payments per year. The calculator above runs this formula automatically.

Semi-annual compounding means interest compounds twice per year (every six months) rather than monthly. Canada's Interest Act and lender convention apply this to residential fixed-rate mortgages. The effect: a 5% Canadian quoted rate has an effective annual rate of about 5.0625% — slightly lower than a 5% U.S. mortgage that compounds monthly (5.1162%). The difference saves the typical Canadian borrower a small amount of interest over the life of the loan.

CMHC mortgage default insurance is mandatory whenever you put less than 20% down on a Canadian home priced up to $1.5 million. The Canada Mortgage and Housing Corporation (or competitors Sagen and Canada Guaranty) charges a one-time premium of 2.80% to 4.00% of the base loan amount, depending on your down-payment tier. The premium is normally added to the mortgage and paid off over the amortization. It protects the lender — not you — if you default.

Canadian minimum down payments tier by purchase price: 5% on homes up to $500,000; 5% on the first $500,000 plus 10% on the portion from $500,000 to $1,500,000; and 20% on homes above $1.5 million. To avoid CMHC insurance, you need 20% down at any price point. The calculator validates these minimums automatically and shows the exact required amount.

A high-ratio mortgage is any Canadian residential mortgage with a loan-to-value above 80% — that is, less than 20% down. High-ratio mortgages must be insured by CMHC, Sagen, or Canada Guaranty. Conventional (low-ratio) mortgages have 20% or more down and do not require insurance, though some lenders still purchase 'portfolio' insurance on conventional mortgages behind the scenes to qualify for better funding rates.

Amortization is how long it takes to pay your mortgage off in full — usually 25 or 30 years in Canada. Term is the length of your current contract with the lender — most commonly 5 years (fixed or variable). At the end of each term you renew at then-current rates and continue paying down the remaining balance over the rest of your amortization. You'll renew several times before the mortgage is fully paid.

Yes, with limits. Most Canadian mortgages allow prepayment privileges of 10–20% of the original loan amount per year, plus the option to double up regular payments. Some open mortgages allow unlimited prepayment with no penalty. Closed mortgages (the default) charge an Interest Rate Differential (IRD) or three-months-interest penalty if you exceed the privilege. Always check your mortgage contract before making large lump-sum prepayments.

Accelerated bi-weekly takes your monthly payment, divides it in half, and charges that amount every two weeks (26 times per year). The result equals 13 full monthly payments per year — one extra payment compared to monthly. That single extra payment typically shaves three to four years off a 25-year amortization and saves tens of thousands in interest. Plain (non-accelerated) bi-weekly just splits monthly across the calendar and produces no savings.

Refinancing a Canadian mortgage means breaking your current term early to access equity, lock in a lower rate, or consolidate debt. You'll typically pay a prepayment penalty (three months of interest for variable mortgages or the greater of three months / IRD for fixed) plus legal and appraisal fees, then qualify for the new mortgage under current stress-test rules. Most lenders cap refinances at 80% loan-to-value, even if your original mortgage was CMHC-insured at higher LTV.

The math is exact for the inputs you enter: semi-annual compounding, accelerated payment frequencies, the official CMHC premium tiers, and the Canadian minimum-down-payment rules are all modeled to industry standard. The calculator does not model the federal stress test, prepayment penalties, IRD differentials, provincial PST on CMHC premiums, or lender-specific fees and rate buydowns. Use the result as an accurate baseline and confirm the exact number with your mortgage broker or lender's commitment letter.

Financial Disclaimer: This Canadian mortgage calculator is provided for educational and informational purposes only and is not financial, lending, legal, or tax advice. Canadian mortgage rates, CMHC premiums, property taxes, home insurance, condo fees, and closing costs vary by lender, province, and borrower profile. Before applying for a mortgage, refinancing, or making any home-buying decision, consult a licensed Canadian mortgage broker, fiduciary financial advisor, or housing counsellor. SamCalculator does not originate mortgages, sell financial products, or receive commissions from lenders.

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