Is it worth breaking my Ontario mortgage to get a lower interest rate?

Breaking your mortgage to get a lower rate is sometimes financially worthwhile, but the math needs careful analysis before you commit. The key question is whether the savings from the new lower rate over the remaining term will exceed the total cost of the penalty and any new legal fees.

Start by getting the exact penalty amount from your current lender in writing for your intended break date. Then calculate the monthly interest savings at the new rate versus your current rate, and determine how many months it takes for the accumulated savings to equal the penalty plus fees. If your remaining term is short, you may recover the penalty quickly. If your remaining term is long and the penalty is very large — particularly an IRD on a fixed mortgage — the break may not pay off before your next renewal.

Context also matters. Breaking to sell a property that you are not porting is a different calculation than breaking to refinance and stay. In a sale context, the penalty is simply a closing cost. For a refinance, it is a bet on future savings. Some lenders offer cashback or rate subsidies to cover break costs when switching to them — these arrangements should be reviewed carefully, as they sometimes lock you into new terms that limit future flexibility.