With mortgage rates shifting after recent Bank of Canada cuts, some homeowners are tempted to break their current mortgage to lock in a lower rate. The catch: ending a mortgage early usually triggers a prepayment penalty. In many cases, the penalty can erase the savings you hoped to get.
Why lenders charge a penalty
A mortgage is a contract. If you end it before the term is up, the lender loses interest income it expected to earn. The prepayment penalty is designed to compensate the lender for that lost interest.
When breaking a mortgage can make financial sense
Breaking a mortgage is ultimately a math problem. It only makes sense if your interest savings (or other benefits) are greater than the penalty and any related costs.
Your penalty quote will depend on factors such as:
- How many months are left in your term
- Your remaining mortgage balance
- Your current contract interest rate
- Current market rates (and sometimes your lender’s posted rates)
Before you do anything, request the exact penalty amount in writing from your current lender. Then compare it against the savings you’d expect over the same period with a new rate.
Variable-rate mortgage penalties: usually simpler
If you have a variable-rate mortgage, the penalty is typically straightforward: three months’ interest on your current balance (though confirm the details in your contract).
Because the calculation is simpler, variable mortgage penalties are often easier to estimate and may be lower than fixed mortgage penalties.
Fixed-rate mortgage penalties: often higher due to IRD
Fixed-rate mortgage penalties can be significantly more expensive. Many lenders charge the greater of:
- Three months’ interest, or
- The Interest Rate Differential (IRD)
When the IRD is higher (which is common when rates have fallen since you took your mortgage), that IRD amount becomes your penalty.
What the Interest Rate Differential (IRD) means in plain language
The IRD is meant to cover the lender’s “lost profit” when today’s rates are lower than your original rate. If you break a fixed mortgage when rates have dropped, the lender can only re-lend that money at a lower rate, so it charges you the difference.
- If rates have gone down since you signed, your IRD penalty is more likely to be high.
- If rates have gone up, your penalty may end up being just three months’ interest.
Important detail: IRD calculations can vary by lender, and some methods can lead to surprisingly large penalties. Always ask how your lender calculates it and request a written breakdown.
Ways to reduce (or sometimes avoid) a mortgage break penalty
- Run the numbers yourself. Use your lender’s online tools (if available) and double-check the assumptions. Don’t rely only on a phone estimate.
- Consider porting your mortgage. If you’re moving homes, transferring (porting) your existing mortgage to the new property may help you avoid a break penalty, if your mortgage is portable and you meet the lender’s conditions.
- Time it closer to the end of the term. The cost (especially IRD) can be harsher earlier in the term. If you can wait, the penalty may shrink as the term winds down.
- Use prepayment privileges before you break. Paying down extra principal reduces the balance used to calculate interest-based penalties.
- Shop the market carefully. Compare rates and terms across lenders, but include all costs (penalty, discharge fees, legal/appraisal, and any cashback clawbacks).
Practical takeaway
Before breaking a mortgage, get the penalty quote in writing and compare it to your realistic interest savings. As a rule, variable mortgage penalties are often three months’ interest, while fixed mortgage penalties can be much higher due to IRD—so always do the math before you sign anything new.