Since late 2024, first-time buyers and new construction purchasers can access 30-year mortgage amortization in Canada. But does this extended term truly cost more? Here’s a detailed comparison to help you choose.
1. New rules 2024-2026
In August 2024, the federal government announced the expansion of 30-year amortization for insured mortgages (CMHC, Sagen, Canada Guaranty) for two categories of buyers:
First-time buyers
Buyers who haven’t owned a home in the past 4 years can amortize over 30 years, even for existing properties.
New construction
Any buyer of a new build (pre-construction or move-in ready) can access 30-year amortization, even if they already own property.
Uninsured mortgages (20%+ down payment)
For conventional uninsured mortgages, 30-year amortization was already available from most lenders.
Price cap raised to $1.5M
The insured mortgage price cap increased from $1M to $1.5M in December 2024, broadening access.
2. Comparative calculation
Let’s look at a concrete example with a $450,000 mortgage at a 4.5% fixed rate.
Scenario: $450,000 mortgage at 4.5%
• Mortgage amount: $450,000
• 5-year fixed rate: 4.5%
• 25-year amortization → monthly payment: $2,487/mo
• 30-year amortization → monthly payment: $2,249/mo
• Monthly difference: $238/mo
Total interest cost
• 25-year amortization: total interest $296,100
• 30-year amortization: total interest $359,640
→ Difference: $63,540 more in interest over 30 years
Choosing 30 years costs $63,540 more in interest, but frees up $238/mo in cash flow. The question is: what do you do with that $238?
3. Detailed comparison table: 25 vs 30 years
Full comparison on a $450,000 mortgage at 4.5%.
| Criteria | 25 years | 30 years |
|---|---|---|
| Monthly payment | $2,487 | $2,249 |
| Total interest | $296,100 | $359,640 |
| Equity after 5 years | ~$89,000 | ~$66,000 |
| Total duration | 300 months | 360 months |
| Total cost (principal + interest) | $746,100 | $809,640 |
Break-even analysis: if you invest the $238/mo savings at a 6% annual return, you would accumulate approximately $239,000 after 30 years. That far exceeds the $63,540 in additional interest, making the 30-year option mathematically advantageous — provided you consistently invest the difference.
4. Who should choose 30 years?
A 30-year amortization is particularly suited to certain profiles:
First-time buyers on a tight budget
The $238/mo reduction can make the difference between qualifying or not for your first home.
Disciplined investors
If you systematically invest the difference in a TFSA or RRSP, the long-term returns can exceed the additional interest cost.
Self-employed workers
The lower payment provides more flexibility to manage variable income.
Conversely, if you want to build equity quickly and minimize total interest, 25 years remains the safest choice. To compare rate types, see our guide on fixed vs variable mortgage in 2026.
5. Impact on mortgage qualification
A 30-year amortization reduces the monthly payment, directly improving your debt service ratios (GDS and TDS). In practice, this can increase your borrowing capacity by approximately 10%.
For example, if you qualify for $450,000 over 25 years, you could qualify for approximately $495,000 over 30 years, all else being equal. Note that the stress test still applies at the higher of the contract rate + 2% or 5.25%.
At renewal, you can accelerate repayment by reducing the remaining amortization. For more details, see our guide on mortgage renewal in 2026.
Find the best rate and amortization strategy for your situation.
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