Breaking a mortgage early in Canada costs one of two penalties: on a variable-rate mortgage, typically three months’ interest; on a fixed-rate mortgage, the greater of three months’ interest or the interest rate differential (IRD). The IRD is the one that shocks people, because it can grow into the tens of thousands when rates have fallen since you signed. Before breaking a term for any reason, get your lender’s exact payout figure in writing — estimates, including mine, are a starting point, not the number.

Photo: Crisco 1492, via Wikimedia Commons (CC BY-SA 4.0).

How does the three months’ interest penalty work?

It is the simpler of the two. On many variable-rate mortgages, the prepayment penalty is three months’ interest on the balance you are paying out. On a $400,000 balance, that is commonly in the few-thousand-dollar range — real money, but often small next to what a move or a much lower rate can save.

That illustration is arithmetic, not a quote: your actual balance, rate and remaining term all feed the real number, which is why the written payout statement matters.

What is the IRD, and why can it be so large?

The interest rate differential compares your contract rate with the lender’s current rate for a term matching what you have left, and multiplies the difference across your balance and remaining time. Sign a five-year fixed at a higher rate, watch market rates drop, then break in year three — the lender’s lost interest is real, and the IRD passes it to you.

Lenders calculate IRD differently — some use posted rates rather than the discounted rate you actually pay, which can inflate the figure sharply. Nothing about the IRD is standardized, so two lenders can produce very different penalties on similar mortgages.

That is also why this decision belongs inside a Mortgage Renewal Check or a Pre-Approval & Refinance Check well before any move: the penalty is a known input to the math, not a surprise to absorb after.

What does an IRD penalty look like in real numbers?

Illustration only — arithmetic with round numbers, not a quote. Take a $400,000 balance, a 5.00% contract rate, a 3.50% comparison rate, and 3 years remaining:

Differential: 5.00% − 3.50% = 1.50%
IRD: 1.50% × $400,000 × 3 years ≈ $18,000
Three months’ interest: $400,000 × 5.00% ÷ 4 ≈ $5,000
Penalty = the greater of the two ≈ $18,000

Your lender’s calculation uses its own comparison term, exact days remaining, and posted-rate schedule, so your figure will differ — possibly by a lot. Use illustrations to understand the math, never to budget a payout.

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When does breaking a mortgage still make sense?

More often than the penalty headline suggests. Moving for work or family, separating and restructuring title (see Spousal Buyout Mortgages in Alberta), consolidating expensive debt, or dropping to a much lower rate can all outweigh the cost — what matters is the net picture over the time you will actually hold the new mortgage.

Also check your options before assuming a break: many mortgages are portable to a new property, and some allow a blend-and-extend that averages your old rate with current pricing. Both can avoid or shrink a penalty entirely.

Whatever the reason, the order of operations is fixed: written penalty figure first, full comparison second, decision third. Never sign a new commitment on the strength of an estimate.

How can you reduce the penalty before you break?

Two tactics the fine print allows. Use your prepayment privileges first: before a planned sale, use your annual lump-sum and payment-increase privileges — commonly 10–20% per year, but they vary by lender, so confirm yours — to shrink the balance the penalty is calculated on. And time the break to renewal where you can: a penalty with months remaining is far smaller than one with years remaining, so sometimes a short delay changes the decision.

Thinking about breaking your mortgage for a move, a refinance or a separation? Call me at (780) 722-5621 — I will try to call you this week, and if you reply with a good time, we can run your penalty and your options side by side first.

By Travis Bannert, Realtor and Mortgage Broker
Travis Bannert, Mortgage Broker | Next Door Mortgages, Dominion Lending Centres | (780) 722-5621 | nextdoormortgages.com