Mortgage prepayment penalty in Chomedey: how to calculate it — and often avoid it
Breaking your mortgage before the term ends can cost a few hundred dollars… or several thousand. Here is how the number is built, and the concrete levers to bring it down.
Quick answer
In short: the penalty for breaking a fixed-rate mortgage is the greater of three months' interest or the interest rate differential (IRD). It depends on your balance, your rates and the months left in the term — not on your amortization. It can often be reduced: porting, selling at maturity, or a blend-and-extend.
This guide is for homeowners in Chomedey (Laval). In a market where values have risen sharply — the median single-family home in Chomedey reached $628,500 in Q1 2026 — a mispriced penalty on a large balance can mean several months of payments. If you're preparing a project in the area, see also Financing a home in Chomedey and the verified experts in Laval.
What a break penalty really is
When you sign a fixed-rate mortgage, you commit for a set length of time — the term, often five years. If you repay the full balance before the end of that term, because you sell, refinance or switch lenders, the lender loses the interest it expected to collect. The penalty compensates for that loss. It is neither an arbitrary fine nor a flat percentage: it is a calculation, and it can be anticipated.
In my work as a broker, it is the most common bad surprise — and the most avoidable. Most owners discover the amount at the worst moment: once the sale is closed, or in the middle of negotiating a new loan. Understanding the number in advance changes everything.
The two calculations — and which one applies
On a fixed rate, the lender keeps the greater of the two:
- Three months' interest. Simply the balance × your rate ÷ 12 × 3. This is the floor, and it applies when current rates are close to or higher than your original rate.
- The interest rate differential (IRD). Roughly: the balance × (your rate − the current rate for a comparable term) × the time left in your term. When rates have dropped since you signed, this amount far exceeds three months' interest.
Crucial point: neither depends on your amortization (15, 20 or 25 years). Amortization sets your monthly payment, not the penalty. The only levers are the balance, the rates and the time left in the term.
Interactive tool
Estimate your penalty in 20 seconds
For a fixed-rate mortgage. The result updates as you type.
Simplified estimate, for guidance only. Each lender uses its own IRD method (posted rate at origination, discount granted, term rounding). For an exact figure and a tailored strategy, have the calculation done by your broker or lender.
Why the IRD can balloon
The IRD grows with two things: the rate gap and the time left in the term. Each remaining month of term adds roughly "balance × gap ÷ 12" to the bill. On a large balance with a gap of 1 to 2%, that can be several hundred dollars per remaining month — hence five-figure penalties when you break early in a five-year term. Conversely, a few months from maturity, the IRD melts away, and the three-months'-interest floor applies.
Five ways to avoid or reduce it
- Porting. Most mortgages are "portable": you transfer your rate and balance to the new property, with no penalty. The first reflex when you sell to buy again.
- Blend-and-extend. The lender blends your current rate with the market rate and extends the term: you avoid the penalty while adjusting your rate.
- Sell at maturity. At the end of the term, the penalty is zero. When timing allows, aligning the sale with renewal saves a lot.
- Use your prepayment privileges. Many mortgages let you repay 10 to 20% of the balance per year with no penalty: reducing the balance before breaking reduces the penalty accordingly.
- Pick the right moment. Since the IRD fades late in the term, waiting a few months can change the math entirely.
Each of these levers depends on the precise clauses of your contract. That is exactly the kind of check a mortgage broker runs with you before you make an irreversible decision.
Frequently asked questions
How is the penalty on a fixed-rate mortgage calculated?
The lender takes the greater of two amounts: three months' interest (balance × rate ÷ 12 × 3) or the interest rate differential (IRD), based on the gap between your rate and the current rate, multiplied by the time left in your term.
Does the penalty depend on my amortization (15, 20, 25 years)?
No. It is calculated on your outstanding balance, your rates and the months left in your term. Amortization sets your monthly payment, not the cost of breaking the mortgage.
Can the penalty be avoided entirely?
Sometimes: by porting your mortgage to the new property, by selling at the end of the term, or through a blend-and-extend when refinancing. A broker can check which applies to your contract.
Is the penalty lower on a variable-rate mortgage?
Usually yes: on a variable rate the penalty is most often limited to three months' interest, with no IRD calculation.
