A 40-year mortgage is the longest amortization period available from Canadian lenders and carries the lowest monthly payment of any standard mortgage term. The trade-off is significantly more interest paid over the life of the loan. Because mortgage insurers (CMHC, Sagen, Canada Guaranty) do not cover amortizations this long, a 40-year mortgage is only available as an uninsured product — requiring at least 20% down.
Monthly Payment Comparison
The appeal of a 40-year amortization is the lower monthly payment. Here is how it compares to shorter amortizations on a $600,000 mortgage at 5%:
| Amortization | Monthly Payment | Total Interest | Extra Interest vs 25-Year |
|---|---|---|---|
| 25 years | $3,486 | ~$517,000 | — |
| 30 years | $3,156 | ~$596,000 | +$79,000 |
| 35 years | $2,962 | ~$658,000 | +$141,000 |
| 40 years | $2,831 | ~$708,000 | +$191,000 |
The 40-year option saves $655/month versus a 25-year mortgage — but at a cost of $191,000 in additional interest over the full amortization.
Who Offers 40-Year Mortgages in Canada?
The major Schedule A banks (RBC, TD, Scotiabank, BMO, CIBC) generally max out at 30-year amortizations. For 40-year terms, you typically need to work with:
- B-lenders (alternative lenders): Equitable Bank, Home Trust, Bridgewater Bank
- Credit unions: Some provincial credit unions offer up to 40-year amortizations
- Private lenders: Available but at significantly higher interest rates
- Monoline lenders via mortgage brokers: Some offer extended amortizations for qualified borrowers
A mortgage broker can source options across lenders and identify who is currently offering 40-year terms given that product availability changes with market conditions.
Requirements for a 40-Year Mortgage
Minimum 20% down payment: Since CMHC insurance is not available on amortizations beyond 25 years (or 30 for new construction), borrowers need at least 20% down to access a 40-year term.
Stress test: All federally regulated lenders must stress test borrowers at the greater of their contract rate plus 2% or the Bank of Canada benchmark rate. A 40-year amortization lowers your payment but does not change the stress test rate — you still need to qualify at a higher rate than your actual mortgage rate.
Credit and income requirements: B-lenders typically have more flexible credit score minimums (580–620 vs 680+ for A-lenders), but the trade-off is a higher interest rate — often 0.5–2% above prime lender rates.
How Equity Builds More Slowly
A key downside of a 40-year mortgage is slow equity accumulation in the early years. With a 40-year amortization, a much larger portion of each payment goes to interest rather than principal.
| Year | Equity Built (25-yr, $600K at 5%) | Equity Built (40-yr, $600K at 5%) |
|---|---|---|
| After 1 year | ~$9,000 | ~$5,300 |
| After 5 years | ~$46,000 | ~$28,000 |
| After 10 years | ~$99,000 | ~$63,000 |
Slower equity growth means:
- Less equity available for a HELOC or refinancing
- A higher loan-to-value ratio if property values fall
- Less financial cushion if you need to sell
When a 40-Year Amortization Makes Sense
Qualifying in a high-cost market: In markets like Toronto or Vancouver, extending amortization can make the difference between qualifying and not. Use our mortgage affordability calculator to compare scenarios.
Cash flow management: Self-employed borrowers or those with irregular income sometimes prefer lower mandatory payments, using surplus income for prepayments.
Investment strategy: Some borrowers use the savings to invest elsewhere — though this requires discipline and assumes investment returns that exceed the mortgage rate after tax.
Prepayments: The Most Important Tool
The real power of a 40-year mortgage is the built-in flexibility. Most Canadian mortgages allow prepayments of 15–20% of the original mortgage balance annually, without penalty. Making regular prepayments dramatically shortens the effective amortization.
| Extra Monthly Payment | Effective Years Saved | Interest Saved |
|---|---|---|
| $250/month | ~5 years | ~$55,000 |
| $500/month | ~9 years | ~$95,000 |
| $1,000/month | ~14 years | ~$150,000 |
(Estimates for $600,000 at 5%, 40-year amortization.)
40-Year Mortgage vs 35-Year Mortgage
The difference between 35 and 40 years is less dramatic than the jump from 25 to 35 years:
| Feature | 35-Year | 40-Year |
|---|---|---|
| Monthly payment (at 5%, $600K) | $2,962 | $2,831 |
| Monthly savings vs 35-year | — | ~$131 |
| Additional interest vs 35-year | — | ~$50,000 |
| Lender availability | Better | More limited |
For many borrowers, the 35-year option is a better balance of payment reduction and interest cost — while being more widely available. See our 35-year mortgage guide for a full comparison.
Key Takeaways
- 40-year mortgages require 20% down (uninsured) and are offered by B-lenders and some credit unions
- Monthly payments are the lowest available but total interest is the highest
- Equity builds slowly — a significant risk if property values decline
- The mortgage stress test applies at the standard qualifying rate regardless of amortization length
- Most effective when paired with aggressive prepayments to reduce the effective term
Related: 35-Year Mortgage in Canada · 30-Year Mortgage Guide · Mortgage Types in Canada · Alternative Mortgages