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30-year amortization: who qualifies and what it costs

The eligibility rules, the lower monthly payment and the extra interest over time, with a $400,000 example.

Mathieu St-Onge · Published October 13, 2026Sources: CMHC, Home Start mortgage loan insurance. Finance Canada, mortgage reforms. Reviewed October 13, 2026.

The short answer

Who qualifies

For an insured loan (down payment under 20%), according to CMHC:

  • at least one borrower is a first-time buyer, or the home is new and never occupied;
  • the price is under $1,500,000;
  • the borrower lives in the home;
  • the credit score is at least 600.

A 0.20 point surcharge is added to the insurance premium on 30 years: 4.20% instead of 4.00% at 5% down. An uninsured loan (20% or more) may be offered over 30 years depending on the lender’s policy.

What it changes, in numbers

$400,000 loan at 4.5%25 years30 years
Monthly payment$2,214$2,017
Payment difference−$197 a month
Total interestabout $264,200about $326,100
Extra interestabout $61,900

Shortening it later

Contracts often allow prepayments or a higher payment. Ask me for the lender’s limits before you sign.

Frequently asked questions

Does 30 years help with the stress test?

Yes, a lower payment raises the amount you qualify for.

Can I go from 30 to 25 years?

Yes, at renewal or with extra payments, depending on the contract.

Does 30 years change the rate?

Not always. The insurance premium does rise by 0.20 point.

How I can help

Calculate the mortgage payment