Breaking Your Mortgage in Canada: The 3 Penalty Types That Decide What You Pay

If you have ever broken a mortgage partway through the term, you know the moment. The home is sold, the move is planned, and then the payout statement arrives with a number you never expected.

That number was in your commitment all along. Almost nobody points at it before you sign — but it is written there, in the prepayment section, and it decides what leaving early will cost you.

Canadian mortgage penalties are calculated in 3 main ways. Which one is in your commitment changes the bill completely — by thousands of dollars, on the same balance, at the same rate.

Your penalty is set by the clause, not the rate

Most buyers compare mortgages by rate. A 0.1% difference feels like the whole decision. But the rate only sets what you pay while things go to plan. The penalty clause sets what you pay when life changes — a move, a separation, a refinance — and you need out early.

That is why a smaller mortgage can cost more to break than a bigger one. Here are the 3 types, with real cases for each.

Type 1: Three months' interest — the simple one

This is the standard penalty on most variable-rate mortgages: 3 months of interest on your remaining balance, at your contract rate.

It is the most predictable of the 3 types. You can estimate it on the back of an envelope, and it does not depend on what rates do after you sign.

Case: a mortgage with a $520,000 balance → a penalty of $6,227.

Type 2: IRD — the one with the paradox

On fixed-rate mortgages, the penalty is usually the IRD (interest rate differential): a charge based on the gap between your contract rate and the lender's rate for a similar term today, applied to your balance for the time left in your term.

Here is the part that surprises people. The comparison often runs through the lender's posted rate — the undiscounted list rate — and the discount you received at signing. So the bigger the discount you negotiated, the bigger the gap the IRD is measured on. A lower contract rate can paradoxically mean a larger penalty.

Case: a $500,000 fixed-rate mortgage → an IRD estimate of roughly $6,488. And in that case, the bigger problem was this: the commitment did not state the penalty formula at all. The person signing had no way to work out their own number before they signed.

Every lender calculates the IRD differently — which rate they compare against, and how they round the remaining term, varies by lender. That is why "roughly this much, I think" is the most dangerous assumption you can make about a fixed-rate penalty.

Type 3: A floor minimum — the one rates cannot shrink

Some commitments set a floor: a minimum penalty written as a fixed percentage of the balance. The example in this guide — 2.75% — is from the commitment terms of one monoline lender we reviewed (§(d) of those terms), in one product. Plenty of commitments have no floor at all, and where one exists, the percentage is whatever that lender's product sets; there is no standard number. If the other calculations come out lower, the floor is what you pay.

The floor does not move. If rates fall, the IRD might shrink — the floor does not. If your balance drops, the floor drops with it, but the percentage never does.

Case: a Toronto condo, a remaining balance of about $327,000 × 2.75% → a penalty of $8,989. That is the figure printed on the actual payout statement — not an estimate.

The point is not that every mortgage has a floor — most do not. It is that this clause exists at all, and the only way to know whether yours has one is to check the prepayment section before you sign.

Why the smaller balance paid more

Put the cases side by side. A $520,000 balance cost $6,227 to break. A balance of about $327,000 cost $8,989. The smaller mortgage cost roughly $2,700 more to exit.

Nothing about the rate explains that gap. The clause does. One commitment used the simple 3-months' interest method; the other had a floor that applied no matter what. Same country, same kind of product, completely different exit cost — decided by a few lines most people never read.

Before you sign: 3 checks

The penalty type is a term you can only choose before you sign. After that, it is the price of every change of plan for the whole term. Check these 3 things in your commitment:

1. Which of the 3 types is my penalty — 3 months' interest, IRD, or a floor minimum?
2. Is the calculation formula actually written in the document?
3. How much can I prepay each year without a penalty (the prepayment privilege), in percent?

If the formula is not written down, ask your lender 1 question in writing: "How exactly is my prepayment penalty calculated, and what would it be if I broke the mortgage today?"

That is also what mguard.ai checks automatically. Upload your commitment and it flags which penalty type you have, whether the formula is stated, and what breaking the mortgage would cost — before you sign, not after you sell.