Mortgage Refinance Calculator

Thinking of breaking your mortgage for a lower rate? Compare your current payment with the new one, estimate the penalty, and find the break-even month โ€” the point where the monthly savings have paid back everything refinancing cost you.

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Penalty helper (estimate): 3 months' interest = balance ร— current rate รท 4. Fixed-rate penalties are often the greater of 3 months' interest or the interest rate differential (IRD), which can be much higher โ€” always confirm with your lender.

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Refinance verdict

$0 saved per month
Current monthly payment$0
New monthly payment$0
Penalty + costs to switch (estimate)$0
Break-even pointโ€”
Total interest โ€” stay on current path$0
Total interest โ€” refinance path$0
Lifetime interest saved (before penalty/costs)$0

How refinancing math works

Your new payment is lower for one or both of two reasons: a lower rate, or a longer amortization spreading the same balance over more years. Only the rate part is a true saving โ€” stretching the amortization lowers the payment but can raise your total interest, which is why this calculator shows both paths' total interest side by side.

The break-even month is (penalty + other costs) รท monthly savings. If you'll keep the new mortgage at least that long, the switch pays for itself; sell or break again before then and it likely cost you money. All payments here use Canadian semi-annual compounding, the same as the rest of this site.

Penalty warning (estimate only): variable-rate penalties are usually 3 months' interest. Fixed-rate penalties are the greater of 3 months' interest or IRD โ€” on a big rate drop, IRD can be tens of thousands of dollars. Get your lender's exact payout statement before deciding.

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