This guide explains mortgage penalties and IRD in plain English so you can compare products by total flexibility, not just the headline rate.
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Fast answer: what is a mortgage penalty in Canada?
A mortgage penalty is the cost of paying off, refinancing, renegotiating, or transferring a mortgage before the term ends, or of prepaying more than your contract allows. Open mortgages usually allow prepayment without penalty. Closed mortgages usually trade flexibility for a lower rate.
- Open = more flexibility, usually higher rate.
- Closed = lower rate, but penalty risk matters.
- Variable = often simpler exit cost.
- Fixed = often the greater of three months' interest or IRD.
When does IRD apply instead of three months' interest?
IRD often matters on closed fixed-rate mortgages when the lender's IRD calculation is higher than the three-month-interest amount. Closed variable mortgages are often closer to three months' interest. The exact contract controls the result.
What is IRD in plain English?
IRD stands for Interest Rate Differential. In plain English, it is the lender's way of estimating how much interest revenue it believes it is losing because you are ending a fixed-rate contract early. There is no single Canadian IRD formula.
That is why two borrowers with the same balance and remaining term can still get very different payout quotes.
Posted-rate IRD vs contract-rate IRD
Posted-rate IRD usually remembers the lender's original posted rate and the discount you received. That can make the penalty much larger than borrowers expect.
Contract-rate IRD usually compares your actual current contract rate against a current replacement rate for a similar remaining term. The legal contract is what counts, not the marketing summary.
Borrower takeaway
posted-rate formulas often hurt more, and contract-rate formulas are usually easier to understand.
Lender formula map
| Lender | Style | What to know |
|---|---|---|
| RBC | Posted-rate IRD with present value / declining balance logic | The original discount can matter and RBC tells borrowers to get the exact cost from the lender. |
| TD | Posted-rate family | TD says the comparison can preserve the original discount and can cost several thousand dollars. |
| BMO | Posted-rate IRD with present value math | BMO says the comparison rate uses the current posted rate for the closest remaining term less the original discount. |
| Scotiabank | Posted-rate IRD with present value math | Scotia says its simplified examples are not the exact final formula. |
| National Bank | Unique fixed formula | National Bank says some fixed penalties are the higher of three months' interest or one month of interest plus the IRD. |
| First National | Contract-rate IRD | First National compares your current mortgage rate with a current replacement rate for a similar remaining term. |
Use the formula in your own mortgage documents, not a generic internet formula, as the binding source.
Why low-rate mortgages can become traps
Reduced-feature mortgages sometimes hide lower prepayment privileges, tougher refinance rules, sale-only exit conditions, or other restrictions that become expensive if your life changes. “Smart”, “advantage”, “basic”, “no-frills”, and “low-rate” are marketing labels, not guarantees of flexibility.
One big example is a bona fide sale clause or sale-only exit style restriction. If you may move, refinance, or restructure debt, you should read that clause carefully before signing.
How to compare offers correctly
Do not compare only rate, payment, or cashback. Compare the full control package: penalty formula, prepayment privileges, portability, discharge rules, cashback clawbacks, legal fees, and whether the product is standard or reduced-feature.
- What is the penalty formula?
- What comparison rate is used?
- How is the remaining term matched?
- Are there sale-only or lender-only restrictions?
- What happens if I refinance or sell early?
When is it worth breaking a mortgage?
Only when the net benefit still works after all costs. Include the lender payout, discharge fees, legal fees, appraisal, cashback repayment, and any reset of your amortization. If the refinance only works on optimistic assumptions, it is probably not worth it.
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What should I ask before I sign?
Ask whether the formula is posted-rate IRD or contract-rate IRD, which comparison rate is used, how the term is matched, whether present value is involved, whether there is a sale-only exit rule, and what happens if you break, port, or refinance early.
Bottom line
The cheapest day-one rate is not always the cheapest real-life mortgage. A mortgage that works on rate day but punishes you on break day can be the wrong mortgage. Focus on flexibility, formula, and exit cost before you sign.
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