Amortization vs term: how Canadian mortgage periods affect your payments
Last updated:
By Editorial team
A $500,000 mortgage at 5.10% with a 25-year amortization produces monthly payments of$2,937. Stretch the same loan to 30 years and payments drop to $2,698 - a $239/month saving that costs an extra $90,450 in total interest over the life of the mortgage. This article is for Canadian buyers weighing lower monthly payments now against the long-run cost of a slower paydown.
The scenario modeled
Both scenarios use the same lender, loan amount, and interest rate. The only variable is the amortization period. Calculations use Canadian semi-annual compounding.
| Input | Option A - 25-year amort | Option B - 30-year amort |
|---|---|---|
| Mortgage amount | $500,000 | $500,000 |
| Interest rate | 5.10% fixed | 5.10% fixed |
| Term | 5 years | 5 years |
| Amortization | 25 years | 30 years |
| Province | Ontario | Ontario |
The findings
The 30-year borrower saves $239/month immediately, which over a full 5-year term amounts to $14,340 in lower payments - useful if cash flow is tight. However, because more of each payment goes to interest on the longer schedule, the 30-year borrower retires $16,216 less principal in that same 5 years. The real cost becomes clear when you look at the full mortgage lifetime: the 30-year path costs $90,450 more in interest than the 25-year path.
| 25-Year amort | 30-Year amort | Difference | |
|---|---|---|---|
| Monthly payment | $2,937 | $2,698 | $239/month less on 30yr |
| Interest over 5-yr term | $119,423 | $121,349 | $1,926 more on 30yr |
| Total cost over 5-yr term | $176,193 | $161,903 | $14,290 less on 30yr |
| Principal paid in 5 years | $56,770 | $40,554 | $16,216 less on 30yr |
| Total lifetime interest | $380,966 | $471,416 | $90,450 more on 30yr |
Canadian context
CMHC-insured mortgages - those with less than 20% down on a home under $1 million - have historically been capped at a 25-year amortization because longer periods increase the risk of negative equity in a declining market. In August 2024, the federal government extended the insured maximum to 30 years for first-time buyers purchasing a newly built home, acknowledging affordability pressure in high-cost cities.
For conventional (uninsured) mortgages, lenders set their own amortization limits. Most major Canadian banks offer up to 30 years; some credit unions go to 35 years. The federal Office of the Superintendent of Financial Institutions (OSFI) stress test applies to both and is calculated at the greater of the contract rate plus 2% or 5.25%.
Source: Canada Mortgage and Housing Corporation (CMHC), "About Mortgage Loan Insurance," accessed April 2026. URL: https://www.cmhc-schl.gc.ca/consumers/home-buying/mortgage-loan-insurance-for-consumers
When this comparison applies - and when it doesn't
The 30-year amortization fits when: You are a first-time buyer whose income is solid but whose monthly budget is stretched after a down payment. The $239/month difference could be the margin between qualifying and not qualifying at today's stress-test rate. You also plan to make lump-sum prepayments as your income grows (most lenders allow 10-20% of the original balance per year), which can recover some of the long-run interest difference.
The 25-year amortization fits when: Your income comfortably passes the stress test at the higher payment, you want to build equity quickly, and you are not relying on the $239 monthly saving for essential expenses. Higher-income buyers who treat prepayment as a wealth strategy benefit most from the shorter schedule.
This comparison does not apply when: You are purchasing with less than 20% down and the property is resale (not newly built) - you are limited to 25 years by CMHC rules unless you qualify under the first-time buyer new-build exception. Always confirm eligibility with your lender before modeling 30-year numbers.
Related articles
Frequently asked questions
- What is the difference between mortgage amortization and mortgage term in Canada?
- Amortization is the total number of years it takes to fully repay the mortgage - typically 25 or 30 years in Canada. The term is a shorter contract period (commonly 5 years) after which the rate and conditions are renegotiated. At the end of each term you renew, usually with an outstanding balance that still reflects the original amortization schedule.
- Can I change my amortization period at renewal in Canada?
- Yes. At renewal you can ask to shorten your remaining amortization - effectively increasing your monthly payment to pay the mortgage off faster. You can also extend it if your lender allows, which lowers payments but adds interest cost. Extending past the original amortization is less common and may require re-qualifying.
- Does a longer amortization mean I pay more interest overall?
- Yes, significantly more. Stretching a $500,000 mortgage from 25 to 30 years at 5.10% adds roughly $90,000 in total interest over the life of the loan, even though monthly payments drop by $240. The longer the balance lingers, the more compounding interest accumulates.
- What is the maximum amortization for an insured mortgage in Canada?
- For most CMHC-insured purchases (under $1 million with less than 20% down), the maximum amortization is 25 years. As of August 2024, an exception allows 30-year amortizations for first-time buyers purchasing a newly built home. For conventional (uninsured) mortgages with 20% or more down, lenders may offer up to 30-year amortizations depending on their own policies.
- Should I choose a shorter amortization if I can afford the higher payments?
- Generally yes, if your cash flow comfortably supports it. A shorter amortization builds equity faster and reduces total interest paid, but it also locks in a higher required payment. Many borrowers compromise by choosing a 25-year amortization but making accelerated bi-weekly payments, which can shave several years off the schedule without the formal commitment.