IRD calculation · fixed & variable · big bank vs monoline · free
Mortgage Break Penalty Calculator — Is It Worth Breaking Your Mortgage?
Breaking a Canadian mortgage early can cost $5,000–$30,000+. Fixed-rate mortgages face the greater of 3-month interest or the Interest Rate Differential (IRD) — and big bank IRD calculations can be 4–8× more expensive than monolines. Know your penalty before you decide.
Educational calculators — always consult a licensed professional before making financial decisions.
The principal balance remaining on your current mortgage.
The rate shown on your mortgage commitment letter or renewal agreement.
The more months remaining, the larger the potential penalty — especially for fixed-rate mortgages.
3 years left — common mid-term break.
Fixed-rate mortgages face IRD or 3-month interest (whichever is greater). Variable-rate mortgages typically only face 3-month interest.
Penalty = greater of 3-month interest or IRD.
Big banks use the posted-rate IRD method (more punitive). Monolines and credit unions use bond yields (less punitive).
RBC, TD, BMO, Scotiabank, CIBC — posted rate IRD method.
Estimated break penalty
$6,750
Method: IRD — posted rate method (big bank)
Penalty Comparison
Is It Worth Breaking?
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What you'll need
- ·Current outstanding mortgage balance
- ·Your contract interest rate
- ·Months remaining in your current term
- ·Whether your mortgage is fixed or variable rate
- ·Whether your lender is a big bank or monoline / credit union
What you'll get
- ✓Break penalty — IRD or 3-month interest, whichever is greater
- ✓Lender comparison — Big bank vs. monoline IRD difference
- ✓Break-even analysis — Whether refinancing makes sense
How it works
Enter your mortgage details
Outstanding balance, contract interest rate, and months remaining in your current term.
Select mortgage type and lender
Variable rate = 3-month interest only. Fixed rate = greater of 3-month interest or IRD. Big banks use posted rates (more punitive).
See your penalty and break-even
The calculator shows your estimated penalty, which method applies, and how many months of lower payments it takes to recover the cost.
Mortgage Break Penalty Examples ($500,000 Balance, 3 Yrs Left)
| Rate Type | Lender Type | 3-Month Interest | IRD Penalty | Penalty Applied |
|---|---|---|---|---|
| Variable | Big bank | $5,900 | N/A | $5,900 |
| Fixed 5.49% | Monoline | $5,900 | $4,200 | $5,900 |
| Fixed 5.49% | Big bank | $5,900 | $18,000 | $18,000 |
| Fixed 5.49% | Big bank (1 yr left) | $5,900 | $6,000 | $6,000 |
Big bank IRD calculations use posted rates at origination — the "discount" you received is subtracted, inflating the penalty. This is legal but opaque.
Authoritative resources
Frequently asked questions
How is the mortgage break penalty calculated in Canada?+
For variable-rate mortgages, the penalty is 3 months' interest on the outstanding balance. For fixed-rate mortgages, the penalty is the greater of 3 months' interest OR the Interest Rate Differential (IRD). IRD is the difference between your contract rate and the lender's current rate for the remaining term, multiplied by the outstanding balance and the remaining time.
Why are big bank mortgage penalties so much higher?+
Big banks (RBC, TD, BMO, Scotiabank, CIBC) calculate IRD using their posted rates at origination, not the discounted rate you actually received. Since posted rates are much higher than the discounted rate, the IRD calculation produces a much larger penalty — sometimes 4–8× what a monoline lender would charge for the same mortgage.
How can I avoid a large mortgage penalty in Canada?+
Strategies include: choosing a variable-rate mortgage (penalty capped at 3 months' interest); choosing a monoline or credit union lender (smaller IRD calculation); waiting until the last 3–6 months of your term when penalties shrink; or making a prepayment (usually up to 10–20% per year is penalty-free) to reduce the balance before breaking.
When does it make sense to break my mortgage early?+
Breaking makes sense when the monthly savings from a lower rate exceed the penalty within the remaining term. For example, if your penalty is $12,000 and you have 36 months left, you need to save at least $333/month to break even. Beyond the break-even point, every month saves money.
Is the mortgage break penalty tax-deductible in Canada?+
The penalty may be tax-deductible if you are breaking the mortgage on a rental property and replacing it with another mortgage for the same property. For a principal residence, the penalty is generally not tax-deductible. Consult a tax advisor for your specific situation.
Want to try different numbers?
Back to the calculator ↑Mortgage Break Penalty Calculator is built and maintained by the RealCostIQ editorial team. Cost ranges and rates are checked against published industry data and contractor quotes, and revised when the underlying figures move. Read our data methodology or more about who builds this. Every calculation runs in your browser — no account, and none of your inputs are stored.
Cost ranges and rates here are checked against contractor quotes and published industry data. If a number still looks off, email Support@RealCostIQ.com and we'll review and fix it.