The 30-Year Amortization Rules: Who Qualifies and What It Really Costs

Buyer Advice Dave Dubbin August 7, 2026

Since December 15, 2024, two groups of buyers can take a 30 year amortization on an insured mortgage, meaning a purchase with less than 20 per cent down: first time buyers purchasing any home, new or resale, and any buyer purchasing a newly built home that has never been occupied. Everyone else with an insured mortgage stays at 25 years. Stretching to 30 buys a lower monthly payment in exchange for more interest over the life of the loan, plus a small insurance surcharge. Here is who counts, and what it really costs.

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Who counts as a first time buyer

For these rules you qualify if you have never bought a home, if you have not owned and occupied a home in the last four years, or if you are coming out of a marriage or common law relationship breakdown. That middle category surprises people. Sold years ago and been renting since? You may be a first time buyer again in the government's eyes.

If none of that applies to you, there is still a lane: any buyer purchasing new construction that has never been occupied can take the 30 year option on an insured mortgage.

The fine print

Three things ride along. The insured price cap is $1.5 million, so above that you need 20 per cent down anyway. The stress test still applies, meaning you qualify at a rate two points above your contract rate. And the 30 year option carries a surcharge of 0.20 percentage points on your mortgage default insurance premium. Small, but real, and it compounds quietly because the premium gets added to the mortgage itself.

The worked example: $600,000 with 10 per cent down

	25 year amortization	30 year amortization
Purchase price	$600,000	$600,000
Down payment (10 per cent)	$60,000	$60,000
Insurance premium	3.10%, about $16,740	3.30%, about $17,820
Total mortgage	$556,740	$557,820
Monthly payment	About $3,081	About $2,813
Interest over the full amortization	About $367,700	About $454,700
Ontario sales tax on the premium, cash at closing	About $1,339	About $1,426

Both columns assume an illustrative 4.5 per cent rate held for the entire amortization, with Canadian semi annual compounding. Real rates reset at every renewal, so treat the comparison as the point, not the exact dollars.

Read the middle rows together. The 30 year option frees up about $269 a month. The price of that breathing room, if you never accelerate a single payment, is roughly $87,000 in extra interest and five more years of payments. That is the whole trade, in two numbers.

Getting your buying plan in order? These three fit right beside this one:

When 30 years makes sense

Two situations, mainly. The first is qualifying power. Because your debt ratios are calculated on the actual payment, the lower 30 year payment can raise the purchase price a lender will approve. For buyers stretching into their first home in an expensive market, that extra room sometimes decides whether the purchase happens at all.

The second is cash flow discipline by choice. Take the 30 year schedule for the smaller obligation, then use prepayment privileges, most lenders allow lump sums of 10 to 20 per cent a year plus payment increases, to pay it down like a 25 when life cooperates. You get the flexibility without the commitment. The interest cost above assumes you never do this. Most people who plan to prepay, in our experience, prepay less than they planned, so be honest with yourself about which buyer you are.

When it does not

If the only way a purchase works is the 30 year payment at today's rates with nothing left over, that is the market telling you something. A longer amortization thins your equity growth in the early years, meaning more of each payment goes to interest and less to actually owning your home, and it leaves you more exposed if prices soften or rates rise at renewal. Opportunity cost cuts here too: $269 a month is real money, but so is what it costs you to get it.

The bottom line

The 30 year insured amortization is a useful tool for first time buyers and new build purchasers, not free money. Know the surcharge, know the lifetime interest number, and decide on purpose rather than by default. We are realtors, not mortgage brokers, so before you commit, have a licensed broker or your lender run your actual numbers.