25 vs. 30-Year Amortization: Which Should You Take?

Key takeaways

• Amortization is the payoff period. The term is how long your rate is locked — different things.
• Thirty years means a lower payment and more interest over time.
• It also increases the amount you qualify for, which is why it is tempting.
• You can take 30 years and pay like it is 25. The reverse is not available.
• Prepayment privileges are what make that flexibility real. Ask what yours are.

Who this guide is for

Edmonton first-time buyers being offered a choice of amortization, and anyone whose pre-approval came back lower than hoped and is wondering whether thirty years is the answer.

Amortization is not the term

These get confused constantly and they are unrelated numbers.

• Amortization — how long the whole mortgage takes to repay. 25 or 30 years.
• Term — how long your current rate and contract run. Commonly five years.

You will renew several times over one amortization. Choosing 30 years does not lock you into anything for 30 years; it sets the schedule the payment is calculated against.

What the extra five years actually does

Spreading the same principal over more payments makes each one smaller. That is the whole mechanism, and the size of the effect is meaningful but not transformative — a reduction in the payment, not a different price bracket.

What you give up is that more of each early payment goes to interest and less to principal, so equity builds more slowly and the total interest paid over the life of the loan is higher. Both effects are real.

Why it changes what you qualify for

Because your ratios are calculated on the payment, a smaller payment leaves more room inside GDS and TDS, so a 30-year amortization increases your maximum purchase price.

That is genuinely useful for a buyer who is close to qualifying, and it is also the thing to be careful about. Qualifying for more is not the same as being able to comfortably carry more, and the ratios do not know about your savings goals or your other plans.

Our guide to how debt changes what you can buy covers the ratio arithmetic in detail.

Who can actually get 30 years

It depends on your down payment, because that decides whether the mortgage is insured.

• Less than 20% down — the mortgage is insured, and the standard maximum is 25 years. Since the December 2024 reforms a 30-year option is available to first-time buyers, and buyers of newly built homes.
• 20% or more down — uninsured, and 30 years is commonly available, subject to the lender.

Rules in this area move. Confirm current eligibility with a mortgage professional rather than relying on an article, including this one.

The strategy most people miss

Take the 30-year amortization and make payments as though it were 25.

This gives you the lower required payment as a safety net and the faster payoff as your default behaviour. In a month when the furnace goes, you drop back to the contractual payment without asking anyone’s permission. In every other month you pay extra and the amortization shortens itself.

The reverse does not exist. A 25-year mortgage cannot be stretched to 30 because you had a bad month — you would have to refinance, with everything that involves.

Prepayment privileges are the fine print that matters

Every lender allows some prepayment and they differ on how much and when.

• Lump sum — a percentage of the original principal each year.
• Payment increase — raising your regular payment by a set percentage.
• Accelerated frequency — biweekly accelerated payments make the equivalent of one extra monthly payment a year, almost invisibly.

A slightly higher rate with generous privileges can beat a lower rate with restrictive ones, depending on how you intend to pay. That is not a general rule — it is a question to put to your broker with your actual plan.

What it does to your equity

Equity comes from two places: the market, and the part of each payment that goes to principal rather than interest. Only the second is under your control.

On a longer amortization, more of every early payment is interest, so after five years you own measurably less of the home than you would on a shorter one. If you sell in that window, that difference is real money at the closing table — and it comes off the same equity you were hoping to carry into the next place.

Over a long hold it matters far less, because you eventually pay the mortgage off either way. This is really a question about how long you intend to stay.

What it does not change

• Your rate. Amortization and rate are set separately.
• The stress test. You still qualify at the greater of your contract rate plus the buffer or the floor, on whichever amortization you take.
• Your ability to renew or switch lenders at the end of the term.
• CMHC premiums, which are driven by your down payment, though a longer amortization on an insured mortgage can carry its own surcharge — ask.

When 30 years is the right call

• The lower payment is what makes the home comfortable rather than tight.
• You want a cash-flow buffer while you rebuild savings after closing.
• Your income is variable, and a lower required payment is worth real money in flexibility.
• You intend to prepay and want the option rather than the obligation.

When 25 is the better call

• You can carry the higher payment comfortably today and prefer not to think about it.
• You want equity to build faster, particularly if you may move again within several years.
• The lower payment would only be used to buy a more expensive home rather than to create room.

There is no universally correct answer here, which is why lenders offer both. What there is, is a correct answer for your income, your savings and your plans — and it takes a broker about ten minutes to produce it.

Sources

• Financial Consumer Agency of Canada — choosing a mortgage
• Government of Canada — mortgage rule changes
• CMHC — home buying resources

Frequently asked questions