Amortization Periods: 25 vs. 30 YearsAmortization Periods: 25 vs. 30 Years

The amortization period is the total length of time to pay off your mortgage in full. In Canada, the two most common options are 25 years and 30 years — and the choice affects your monthly payment, total interest, equity growth, and how GDS/TDS ratios and the stress test limit what you qualify for. CMHC insurance rules also differ for 30-year insured mortgages.

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Understanding the Trade-Off

A longer amortization means lower monthly payments but significantly more total interest paid over the life of the mortgage. A shorter amortization means higher monthly payments but less total interest and faster equity growth. Here is a side-by-side comparison:

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Detailed Payment Comparison

Let’s look at concrete numbers to see the real difference — you can also run your own scenarios with our mortgage calculator. These examples assume a fixed interest rate for the entire amortization period (in practice, your rate will change at each renewal, but this illustrates the structural difference).

Example 1: $400,000 Mortgage at 5.0% Interest

The 30-year amortization saves you $188 per month but costs you $72,082 more in total interest over the life of the mortgage.

Example 2: $450,000 Mortgage at 5.0% Interest

Example 3: $550,000 Mortgage at 5.5% Interest

At higher mortgage amounts and higher interest rates, the cost difference between 25 and 30 years becomes even more dramatic. On a $550,000 mortgage at 5.5%, the 30-year option costs over $118,000 more in interest.

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Eligibility Rules for 30-Year Amortization

The rules around who can access a 30-year amortization in Canada have changed multiple times in recent years. Here is the current landscape:

Insured Mortgages (Less Than 20% Down)

If your down payment is less than 20% and you need mortgage default insurance, the rules for 30-year amortization (in force 15 December 2024, OSFI/CMHC) are:

• First-time buyers: 30-year insured amortization is available on both resale and new construction. This is how the mortgage calculator and affordability calculator model the file when the first-time buyer box is checked (the default on this site).
• Non-first-time buyers: The maximum insured amortization is 25 years. Unchecking first-time buyer on the calculators keeps the term at 25 years — they will not silently apply 30 years to a non-FTHB insured mortgage.

Some lenders may also offer 30-year insured amortization on new construction for buyers who are not first-time buyers. Confirm with your lender or mortgage broker; this site’s calculators follow the first-time buyer rule above.

Uninsured Mortgages (20% or More Down)

If your down payment is 20% or more, you do not need mortgage insurance, and 30-year amortization is generally available regardless of whether you are a first-time buyer, the property type, or whether the home is new or resale. Lenders have more flexibility with uninsured mortgages because they are not bound by CMHC’s insurance guidelines. However, OSFI’s B-20 guidelines still apply to federally regulated lenders for the stress test.

Some lenders may even offer amortization periods beyond 30 years for uninsured mortgages, though this is less common and typically comes with a higher interest rate.

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The Equity Question

One often-overlooked consequence of choosing a longer amortization is how slowly you build equity in your home. Equity is the difference between your home’s value and what you owe on your mortgage. In the early years of a mortgage, most of your payment goes to interest rather than principal — and a longer amortization stretches out this interest-heavy period even further.

After 5 years on a $450,000 mortgage at 5%:

After five years, the 25-year borrower has paid down $18,200 more in principal. If home values stay flat, this extra equity provides more financial flexibility, a larger down payment if you sell and buy again, and more borrowing room for a home equity line of credit.

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When Does 30 Years Make Sense?

Despite the higher total interest cost, there are legitimate reasons to choose a 30-year amortization:

• Cash flow is tight: If you are stretching to afford a home, the lower monthly payment might be the difference between qualifying and not qualifying. The extra $200 per month can cover utilities, maintenance, or keep you above the stress test threshold.
• You plan to make prepayments: If your mortgage allows annual lump-sum prepayments (most do, typically up to 10-20% of the original principal per year), you can take the 30-year amortization for the safety of lower required payments while making extra payments when you can. This gives you the flexibility of low payments when money is tight and the ability to pay down faster when you have extra cash.
• Investment opportunity cost: Some buyers prefer a lower mortgage payment so they can invest the difference. If your investments earn more than your mortgage interest rate (after tax), this strategy can work — though it involves risk and discipline.

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When Does 25 Years Make Sense?

A 25-year amortization is the better default choice for most buyers who can comfortably afford the higher payment:

• You want to minimize total interest paid — The interest savings of $70,000 to $120,000 are substantial.
• You want to build equity faster — Faster equity growth gives you more options down the road, including the ability to access home equity for renovations or other investments.
• You want to be mortgage-free sooner — Owning your home outright at 55 instead of 60 (or 45 instead of 50) is a meaningful lifestyle and retirement planning benefit.
• You qualify comfortably — If the monthly payment on a 25-year amortization fits well within your GDS and TDS ratios with room to spare, there is little reason to extend to 30 years.

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Sources: CMHC — Mortgage Loan Insurance · OSFI — Residential Mortgage Underwriting (B-20)

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