Mortgage Amortization Canada Explained

How amortization works in Canada, how long you can take, and what it actually costs you over time.

What Is Amortization?

Amortization is the total length of time it takes to fully repay your mortgage — from first payment to last. In Canada, the standard amortization is 25 years for insured mortgages (those with less than 20% down). Conventional mortgages (20%+ down) can go up to 30 years, and as of August 2024, qualifying first-time buyers of new construction can access 30-year amortizations on insured mortgages.

Amortization is different from your mortgage term. The term (typically 5 years) is the period your interest rate is fixed. You'll renew multiple times over a 25-year amortization — five 5-year terms, for example.

25-Year vs 30-Year Amortization: The Real Numbers

Factor	25-Year Amortization	30-Year Amortization
Mortgage amount	$600,000	$600,000
Rate	4.74%	4.74%
Monthly payment	$3,387	$3,101
Monthly savings	—	$286 lower
Total interest paid	~$416,000	~$516,000
Extra interest cost	—	~$100,000 more

How Amortization and Mortgage Payments Are Calculated in Canada

Canadian mortgages use semi-annual compounding (not monthly compounding as in the US). This is mandated by the Interest Act. The effective annual rate is slightly different from the nominal rate, and your lender's amortization schedule reflects this. For a 4.74% nominal rate with semi-annual compounding, the effective monthly rate is approximately 0.3929% — and this is what drives your actual payment calculation.

The 2024 Rule Changes: Extended Amortization Access

As of August 1, 2024, the federal government expanded access to 30-year amortizations on insured mortgages in two scenarios:

• First-time buyers purchasing new construction: Can access 30-year amortization with CMHC insurance, reducing monthly payments and improving qualifying power
• All buyers of new construction: Even non-first-time buyers can access 30-year insured amortizations on newly built homes

This change was designed to stimulate new housing construction and help more buyers qualify in expensive markets. The tradeoff remains the same: lower monthly payments but substantially more interest over time.

How Extra Payments Dramatically Reduce Amortization

Most Canadian mortgages allow annual prepayments of 15–20% of the original mortgage balance without penalty. Using these privileges aggressively can shave years off your amortization and save enormous amounts of interest:

Strategy	On $600K mortgage at 4.74%	Years Saved	Interest Saved
Monthly $200 extra	25yr → ~22.5yr	2.5 years	~$35,000
Monthly $500 extra	25yr → ~20yr	5 years	~$80,000
Annual 15% lump sum	25yr → ~13yr	12 years	~$190,000

Bi-Weekly Accelerated Payments

Choosing bi-weekly accelerated payments instead of monthly payments is one of the simplest ways to shorten your amortization. With bi-weekly payments, you make 26 payments per year instead of 24 (12 monthly × 2). The extra two payments per year go entirely to principal, reducing your amortization by approximately 3 years on a standard 25-year mortgage — with no penalty and minimal cash flow impact.

Should You Choose a Longer Amortization?

A longer amortization is not inherently bad if you use the monthly savings wisely. If you take a 30-year amortization and invest the $286/month difference in a diversified portfolio earning 7% annually, you may come out ahead over 30 years compared to the 25-year mortgage. This requires discipline and investment knowledge. For most borrowers, the shorter amortization — or a 30-year amortization with aggressive prepayment — is the more reliable path to financial security.