Canadian Mortgage Calculator
Canadian mortgages with semi-annual compounding and accelerated payment frequencies.
Inputs
Minimum 5% for insured mortgages (CMHC required if < 20%).
Insured mortgages are capped at 25 years in Canada.
Payment Amount (CAD)
$3,575.51
Monthly Equivalent
$3,575.51
Normalised to monthly for cross-frequency comparison.
Total Repaid
$1,072,652.43
Total Interest
$472,652.43
Mortgage Amount (incl. CMHC)
$600,000.00
Loan to Value (LTV)
80.00%
CMHC Insurance Premium
$0.00
Applicable when down payment < 20%.
CMHC Premium Rate
0.00%
Years Saved (Accelerated)
0.0
Step by step
Base loan (property − down payment)
CA$750,000 − CA$150,000
= CA$600,000
Canadian compounding conversion
Semi-annual 5.25% → equivalent 12× rate
= 5.193482%
Required by the Interest Act of Canada
Monthly payment
= CA$3,575.51
How it works
Canadian mortgages are unique: the Interest Act of Canada requires semi-annual compounding of the nominal rate regardless of payment frequency. For monthly payments, the posted rate must be converted to an effective monthly rate via convertCompounding(rate, 2, 12). Accelerated bi-weekly payments are simply half the monthly payment paid every two weeks; because you make 26 payments per year rather than the 24 that a pure bi-weekly schedule implies, you effectively make one extra monthly payment per year, shortening the mortgage by 2–4 years. CMHC mortgage insurance is mandatory for high-ratio mortgages (LTV > 80%) and the premium is rolled into the loan.
Formulas
Canadian rate conversion
Monthly rate = (1 + r_nominal/2)^(2/12) − 1
- r_nominal
- Posted nominal annual rate
Accelerated bi-weekly payment
Accelerated bi-weekly = Monthly payment ÷ 2
- M_monthly
- Standard monthly payment
CMHC premium
CMHC premium = Loan amount × Premium rate
- L
- Base loan amount
- p
- CMHC premium rate (2.8% to 4.0%)
Frequently Asked Questions
Why does Canada require semi-annual compounding?
Section 6 of Canada's Interest Act limits the rate at which interest may compound to no more than semi-annually for mortgages. This was intended to protect borrowers from excessively frequent compounding. In practice it means the effective interest rate is slightly lower than an equivalent US mortgage at the same nominal rate.
What is the difference between accelerated bi-weekly and regular bi-weekly?
Regular bi-weekly divides the annual payment total by 26 — you pay the same annual amount as monthly, just split differently. Accelerated bi-weekly takes the monthly payment and divides it by 2, giving you a slightly larger bi-weekly payment. Because 26 × (monthly/2) > 12 × monthly, you're paying extra each year, building equity faster and shortening the amortization by 2–4 years.
Do I always need CMHC insurance?
You need CMHC (or Sagen/Canada Guaranty) mortgage insurance if your down payment is less than 20% of the purchase price. The insurance protects the lender, not you, but it enables higher-ratio mortgages that lenders would otherwise decline. Properties over CA$1 million are not eligible for high-ratio insurance and require a minimum 20% down payment.
What is the maximum amortization period?
CMHC-insured mortgages are capped at 25 years. Conventional mortgages (≥20% down) can have up to 30 years, and some lenders offer 35 years, though this is less common. Longer amortizations reduce monthly payments but significantly increase total interest paid.