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The cost of breaking a fixed mortgage is the difference between a refinance that makes sense and one that only looked good until the penalty appeared. Most people discover that number far too late. This is about knowing it early.
Stephen Green, Mortgage BrokerWaterloo Region · serving all of Ontario
Illustrative and general. Only your lender can issue a binding payout figure, and only for a short window.
Mortgage penalties in Canada — particularly on fixed mortgages from the big banks — are rarely clear until you are already partway through making a change.
By then you have usually committed to something: an offer on a new home, a renovation contract, a consolidation plan, sometimes a separation agreement. The penalty arrives as a fixed obstacle rather than a factor you weighed. It is a bad way to meet a five-figure number.
The calculation behind almost every large penalty on a fixed mortgage. It moves as the market moves and as your term runs down — sometimes sharply.
The simpler alternative, and the one that applies on most variable mortgages. On a fixed mortgage you generally pay whichever of the two is greater.
The comparison figure, the rounding, how the discount you were given is treated. The formula is not standardised, and the differences between lenders are not small.
Exposure is not static. The same mortgage can carry a very different penalty three months later, and maturity dates create windows worth planning around.
Worth understanding once properly. It is the single clause most responsible for penalties that shock people.
An interest differential — the IRD — is a penalty method used on Canadian fixed mortgages. Broadly, it applies when both of these are true:
The lender charges you, in effect, for the income it says it loses. The general shape of the calculation is:
The outstanding principal on the day the mortgage would be discharged, after any prepayment privileges you use first.
The difference between what you agreed to pay and what the lender says it could earn today on a term matching the time you have left. This step is where lenders diverge most — see below.
Multiply that difference by the outstanding principal.
Across the months left on your term. A long remaining term is what turns a modest gap into a very large number.
Step 2 above is not standardised, and the choice a lender makes there is the difference between an irritating penalty and a devastating one.
| Compared against what you signed | Compared against a published benchmark | |
|---|---|---|
| What the lender compares to | The actual discounted figure in your contract | The lender's published benchmark figure, which is normally well above what anyone pays |
| Effect on the gap | Reflects the real difference | Widens the gap, often substantially |
| Effect on the penalty | Usually the smaller outcome | Can be several times larger on an identical balance and term |
| Where you tend to see it | More common with credit unions and broker-channel lenders | More common with the large banks |
| Where to check | Your mortgage commitment and standard charge terms | Same — the wording is there, it is just rarely read |
A short plain-language reference covering the basics, if you would rather have something to keep.
Opens in a new tab. General information only — it does not describe your specific mortgage.
A penalty on its own tells you very little. What matters is the penalty set against what the change is worth over the time you have left. Work that through here.
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Estimates only. Figures are illustrative, assume Canadian semi-annual compounding on fixed-term mortgages, and are subject to final lender approval and terms. Your lender’s payout statement is the only binding figure. Not an approval and not a guarantee of pricing.
Knowing your exposure informs whether to wait for maturity, use privileges first, port instead of break, or leave the mortgage alone entirely.
The worst version of this is finding a five-figure charge after you have already committed to something else. Awareness is most of the protection.
How a lender calculates penalties is a feature you can weigh at the outset, alongside the pricing. Most people never think about it until it costs them.
Based in Waterloo Region, working throughout southwestern Ontario — and able to help homeowners anywhere in the province.
It is the charge a lender applies when you pay off or break a closed mortgage before the end of its term. On a variable mortgage it is usually three months' interest. On a fixed mortgage it is normally the greater of three months' interest or an interest differential calculation, and the differential can be many times larger.
It is the lender's estimate of the interest income it loses by having your mortgage repaid early and having to re-lend that money for the rest of your term on less favourable terms. Broadly: the gap between what you agreed to pay and what the lender could earn today, multiplied by your balance, multiplied by the time left on your term.
Because the comparison figure each lender uses is not standardised. Some compare against the discounted number you actually signed. Others compare against their published benchmark figure, which is typically much higher, and that single choice can multiply the penalty several times over on the same balance and the same remaining term. It is set out in your mortgage contract and it is one of the most consequential clauses in it.
No, and neither can anyone but your lender. Only your lender can produce a binding payout figure, and it is only valid for a short window. What this service does is track your exposure at a high level so you are not discovering the number for the first time in the middle of a decision.
No. Sometimes the penalty is worth paying and the numbers say so clearly. The point is to know it in advance and weigh it properly, rather than finding it at the payout stage when you are already committed.
Variable mortgages are usually simpler — commonly three months' interest — so the exposure tends to be smaller and more predictable. The service still tracks it, but the differential problem is overwhelmingly a fixed-mortgage issue.
Sometimes. Porting to a new property, using your annual prepayment privileges first, timing a move to maturity, or a blend-and-extend with your existing lender can reduce or remove it. Every one of those depends on your lender's rules and your own circumstances, and not all of them are available on every mortgage.
Yes, an open mortgage can be repaid at any time without a prepayment charge, but you pay for that flexibility in the pricing. For most people that trade is not worth it, which is why closed mortgages are the norm.
Your lender, your balance, your term and maturity date, and what kind of mortgage you hold. Your annual statement usually has all of it.
No. It is part of how we look after clients between transactions, and there is no obligation to do anything with what it tells you.
Bring your mortgage statement. We will walk through how your lender calculates a penalty, roughly where you sit today, and whether that changes anything you were planning.