Canadian Mortgage Penalty Calculator

What the mortgage penalty calculator does

The calculator estimates what it would cost to break a closed mortgage before the end of its term. In Canada the prepayment penalty is the greater of two amounts, and the tool works out both, shows which one applies and how large it is. Check the figure before you refinance, sell or switch lenders: it often decides whether an early move saves money.

The two penalty methods

• Three months’ interest: three months of interest on your outstanding balance at your contract rate. This is the smaller, simpler figure and usually applies to variable-rate mortgages.
• Interest rate differential (IRD): the difference between your contract rate and the lender’s comparison rate, charged on your balance for the months left in the term.

On closed fixed-rate mortgages the IRD is often the larger amount, especially when your rate is well above current rates and much of the term remains. Two mortgages with the same balance can face very different IRDs depending on their rate gap and remaining months.

How to use the calculator

1. Enter your outstanding balance.
2. Enter your contract rate.
3. Enter the lender’s comparison rate.
4. Enter the months remaining in your term.

The result shows the three-month interest amount, the IRD, the penalty actually charged and the penalty as a percentage of your balance, with a bar chart comparing the two methods.

A worked example

You owe $300,000 at a 5% contract rate with 36 months left, and the comparison rate is 3%. Three months’ interest is $300,000 x 5% x a quarter of a year, or $3,750. The IRD is $300,000 x the 2% rate gap x three years, or $18,000. The IRD is larger, so the penalty is $18,000, 6% of the balance and nearly five times the three-month figure.

Now keep everything the same but with only 6 months left. Three months’ interest is still $3,750, since it does not depend on time remaining, while the IRD falls to $300,000 x 2% x half a year, or $3,000. The penalty becomes $3,750. With three years left the borrower faces $18,000; with six months left, $3,750.

Posted-rate versus discounted-rate IRD

Real penalties differ from a simple estimate mainly because of how the lender defines the comparison rate. Some lenders, particularly the large banks, base the IRD on posted rates: they compare your original posted rate, less the discount you received, with the current posted rate for the remaining term. Because posted rates sit well above what people actually pay, this can push the differential far past a straight gap between your rate and today’s market rate.

Other lenders, often monoline and broker-focused ones, use discounted rates directly, which usually gives a smaller penalty. The difference can be thousands of dollars on the same mortgage, so enter the comparison rate your own contract uses, and ask the lender which rates they apply if you are unsure.

Mortgage type and the penalty

Open mortgages generally allow full prepayment with no penalty, which is their appeal despite higher rates. Variable-rate closed mortgages usually cap the penalty at three months’ interest. Closed fixed-rate mortgages, the most common kind, are where the IRD typically applies, so your mortgage type tells you straight away whether you are exposed to it.

When breaking still makes sense

A penalty is not automatically a reason to stay. If refinancing to a much lower rate saves more interest than the penalty costs, breaking can still pay. Weigh the penalty against the total savings over the time you plan to keep the new mortgage, not just the monthly difference.

Reducing the penalty

• Use annual prepayment privileges to lower the balance before you break.
• Port the mortgage to a new property, carrying your rate and term forward, if you are moving rather than leaving the lender.
• Blend and extend with your current lender, rolling your rate into a new one without a full break.
• Wait until closer to renewal; as the second example shows, a large IRD can fall to the three-month amount.

Assumptions and limits

The calculator uses the standard three-month and IRD formulas, but lenders define the comparison rate differently, and your contract may add administration fees. Treat the result as a planning estimate, request an exact payout statement from your lender before deciding, and consult a licensed mortgage professional on whether breaking is worthwhile.

This article is general information only and is not financial advice.

About This Canada Mortgage Penalty Calculator

Use this canada mortgage penalty calculator to get an instant estimate based on the figures you enter. Adjust the inputs above to match your situation, or browse all our calculators to plan your next step.