Mortgage Break Penalty Calculator Canada

Every closed mortgage in Canada has a break penalty. For variable-rate mortgages it's always three months' interest — predictable and usually modest. For fixed-rate mortgages, the penalty is the greater of three months' interest or the Interest Rate Differential (IRD). And the IRD is where lenders diverge dramatically.

Monoline lenders and credit unions calculate IRD using your actual contract rate: (your rate − current comparable rate) × balance × years remaining. The logic is straightforward — the lender is being compensated for the interest income they lose when you leave early.

Many Big 5 banks use a different formula. Instead of your contract rate, they use their original posted rate — the undiscounted "sticker" rate you never actually paid. At signing, posted rates were typically 1.5–2.5% above discounted contract rates. The bank compares that inflated posted rate to today's rate, rather than the contract rate you were actually charged. Because the original discount you received is now embedded in the spread, the resulting IRD is larger — sometimes by $15,000–$25,000 on a standard mortgage.

The Financial Consumer Agency of Canada has noted this practice in consumer guidance, but it remains legal. Knowing this before you sign is the only practical protection — a monoline lender with a slightly higher rate at signing can still cost you less in total if you break the mortgage early.