🇨🇦 Canada
🇺🇸 United States🇬🇧 United Kingdom🇩🇪 Deutschland🇷🇺 Россия🇮🇳 India🇦🇺 Australia🇨🇦 Canada🇳🇿 New Zealand
Home›Canada›Mortgage Penalty Calculator

Mortgage Penalty Calculator Canada 2025

Estimate your mortgage break penalty — IRD vs 3-month interest for fixed and variable rates. Compare Big 5 bank vs credit union penalties, and find out if refinancing is worth it.

Canadian mortgage penalties are based on your mortgage type and remaining term. Fixed rate: greater of IRD or 3-month interest. Variable rate: 3-month interest only.
Fixed uses greater of IRD or 3-month; Variable uses 3-month only
$
Outstanding mortgage principal
%
Your contract interest rate
Length of your mortgage term
mo
Months left until your term renewal
%
Rate your lender uses for IRD — ask your lender for exact rate
Big 5 banks use posted rate for IRD (higher penalty)
--

Estimates only. Contact your lender for exact penalty amounts. Not financial advice.

Try another scenario

Found an issue? Send feedback

How to Use This Calculator

Tab "Penalty Estimate"

Select your mortgage type (fixed or variable), enter your remaining balance, current rate, and remaining term in months. For fixed rates, enter the lender comparison rate (ask your lender for the exact rate they use). The calculator shows the applicable penalty — for fixed mortgages it computes both IRD and 3-month interest and returns the greater amount.

Tab "IRD vs 3-Month"

Same inputs as Penalty Estimate, but with a detailed side-by-side comparison of both penalty methods. See exactly how each is calculated, which one applies, and understand the difference between Big 5 bank posted rate calculations vs credit union discount rate calculations.

Tab "Is Breaking Worth It?"

Enter the penalty amount (from Tab 1 or your lender), your current rate, the new rate available, remaining balance, and remaining amortization. The calculator shows monthly savings, total interest saved, break-even months, and net benefit to help you decide whether refinancing makes financial sense.

The Formulas

Interest Rate Differential (IRD):
IRD Penalty = (contract rate - comparison rate) × balance × remaining term in years

3-Month Interest:
3-Month Penalty = balance × annual rate / 12 × 3

Fixed rate penalty: Greater of IRD or 3-month interest
Variable rate penalty: Always 3-month interest

Canadian semi-annual compounding:
Effective monthly rate = (1 + annual_rate / 2)^(1/6) − 1

Big 5 banks vs credit unions:
Big 5 use POSTED rate for comparison → higher IRD penalty
Credit unions use ACTUAL discounted rate → lower IRD penalty

Example

Sarah — Breaking a Fixed Rate Mortgage, $400K Balance

Contract rate: 4.5%. Remaining term: 2.5 years (30 months). Lender comparison rate: 3.5%.

Remaining balance$400,000
Rate differential1.00% (4.50% - 3.50%)
IRD penalty$10,000 (1.00% × $400K × 2.5 years)
3-month interest$4,500 ($400K × 4.5% / 12 × 3)
Penalty charged$10,000 (IRD — the greater amount)

Frequently Asked Questions

The Interest Rate Differential (IRD) compensates the lender for the interest income they lose when you break your mortgage early. It is calculated as the difference between your contract rate and the lender's current comparison rate, multiplied by your balance and remaining term. The 3-month interest penalty is simpler: three months of interest at your current rate. For fixed rate mortgages, lenders charge whichever is greater. Variable rate mortgages always use only the 3-month interest penalty.
Big 5 banks (TD, RBC, BMO, Scotiabank, CIBC) use their posted rate rather than your actual discounted rate when calculating the IRD. Since posted rates are typically 1-2% higher than discount rates, the rate differential used in the IRD formula is smaller, but because the posted rate is used as your "contract rate" basis, it inflates the penalty. Credit unions and monoline lenders typically use your actual discounted rate, resulting in a fairer and lower penalty calculation.
Variable rate mortgages have a straightforward penalty: 3 months of interest. This is calculated as your remaining balance multiplied by your current interest rate, divided by 12, multiplied by 3. This is standard across all Canadian lenders. For example, a $400,000 balance at 5.5% would cost $5,500 in penalty. This is why variable rate mortgages are often recommended for borrowers who may need to break their mortgage early.
Yes, most Canadian mortgages are portable. This means you can transfer your existing mortgage — including the rate, term, and conditions — to a new property without paying a penalty. You typically have 30-120 days to complete the port after selling your current home. If you need additional funds, your lender may offer a blend-and-extend for the difference. Porting is not available if you are simply paying off the mortgage without purchasing a new property.
A blend-and-extend allows you to combine your current mortgage rate with a new rate for an extended term, without paying a prepayment penalty. Your lender calculates a blended rate that is a weighted average of your existing rate and the new rate. While you avoid the penalty, the blended rate will be higher than a pure new rate. This is often a good choice when the penalty is high but the rate difference is modest, or when you want to extend your term at renewal time.

Related Calculators

🏠 Mortgage Calculator
Canadian mortgage payment with semi-annual compounding and CMHC insurance.
💰 Mortgage Affordability
How much mortgage can you qualify for with GDS/TDS ratios?
📋 CMHC Insurance
Calculate CMHC premiums for down payments under 20%.
🏡 Rent vs Buy
Compare the total cost of renting vs buying in Canada.
📈 Land Transfer Tax
Provincial land transfer tax by province including first-time buyer rebates.

Embed This Calculator

Add the Mortgage Penalty Calculator to your website:

<iframe src="https://sum.money/ca/mortgage-penalty-calculator" width="100%" height="700" frameborder="0"></iframe>