The Mortgage Comparison Mistake: Why the Headline Number Isn't the Whole Offer

The comparison most people actually make

Ask most shoppers how they picked their mortgage and you'll get a version of the same story: they got two or three quotes, looked at the number each lender led with, and went with whichever one was lowest.

That's not a foolish way to shop — it's the number every lender puts first, so it's the number that gets compared first. The trouble is what it leaves out. A mortgage offer is a multi-page contract, and the pricing on the cover page is only one line of it. The other lines — how long you're locked into this particular deal, what you're allowed to pay down early without a penalty, and whether the whole thing moves with you if you sell — routinely matter more to what the mortgage actually costs you than a small difference in that first number ever will.

That's especially true if anything changes mid-term: a move, an inheritance, a job change that lets you pay down faster, a marriage or separation. None of those show up in a headline comparison. All of them show up in the fine print most people skip.

What the term length actually decides

According to the Financial Consumer Agency of Canada (FCAC), the length of your mortgage term affects three things at once: which type of interest structure — fixed or variable — is available to you on that product, what you'll owe if you break the contract before the term ends, and how soon you'll be back at the table to renew.

That third point is easy to skip past, but it's not trivial: at the end of every term, without exception, you renew — whether or not the balance is paid off. A shorter term means you're back to shopping and requalifying sooner; a longer one locks in today's structure for longer but usually carries a bigger exit cost if your plans change.

• A shorter term generally means a smaller penalty if you break it, but more frequent renewals and more exposure to whatever pricing looks like each time you're back at the table.
• A longer term generally means fewer renewals, but a much larger penalty if you break it mid-term — particularly on a fixed structure, where the penalty is calculated very differently than on variable.

Prepayment privileges: the flexibility that isn't standardized

Closed mortgages in Canada come with what the FCAC calls a prepayment privilege — an allowance, written into your contract, for extra money you can put toward the mortgage each year without triggering a penalty. Not every lender offers the same privilege, and the FCAC is explicit that these privileges vary from lender to lender. One lender's contract might allow 10% of the original principal a year; another's might allow 20%, structured as a lump sum, an increase to your regular payment, or both.

This is where two offers with an identical headline number can turn out to be very different deals for the same borrower. If you expect a bonus, an inheritance, the sale of another asset, or simply want to be aggressive about paying the mortgage down, the size of your privilege — and whether it's generous enough for what you actually plan to do — matters more than a fractional difference in the number you were quoted.

It's a detail worth reading closely rather than assuming, and we've written the full mechanics separately: how prepayment privileges actually work, including why an unused privilege doesn't roll over into the next year.

Portability: what happens if you move before the term is up

The third piece is portability, and it's the one most people don't think to ask about until they're already selling. If you sell your home to buy another one, the FCAC explains, a portable mortgage lets you transfer your existing mortgage — the balance, its pricing, and its existing terms and conditions — onto the new property, instead of breaking the old contract and starting a new one from scratch.

Not every mortgage is portable, and the ones that are can come with restrictions — on timing, on the new property, or on how much of the balance carries over. If there's any real chance you'll sell and buy again before this term is up, whether the offer in front of you is portable, and on what conditions, is worth confirming in writing before you sign — not after you've listed the house.

How to actually compare two offers

Put the four pieces side by side, for each offer, before you decide: the number you're quoted, the term length and what breaking it early would cost, the prepayment privilege and whether it fits what you actually plan to do, and whether the mortgage is portable if a move is plausible in your timeline. Our Compare tool is built for exactly this — laying two or three scenarios out side by side instead of trying to hold it all in your head.

If penalty exposure is the piece that worries you most, Penalty Protector Pro is built to answer that question specifically, before you're locked into anything. And before signing anything, a second, independent set of eyes on the actual contract — a real estate lawyer, for instance, through the wider network at The Collective — is a sound habit regardless of who you're borrowing from.

None of this is about finding a hidden trick to save money. It's about reading the whole contract instead of the first line of it, so the decision you make actually matches the plan you have — which, most of the time, nobody handed you in the first place.