Why are Canadian mortgage penalties so high?

Banks use posted rates (not your discounted rate) in the IRD calculation, inflating the penalty. Credit unions and monolines typically use discounted rates, resulting in lower penalties.

Can I break a mortgage without a penalty?

Open mortgages allow breaking without penalty. You can also port to a new property or use prepayment privileges to reduce balance and future penalties.

Does the penalty apply when selling a home?

Yes, unless you port the mortgage to a new property at the same time. Blend-and-extend options may also help avoid the penalty.

Is the mortgage penalty tax deductible?

For investment properties only — deductible as a financing expense over 5 years. Not deductible for a principal residence.

Canadian Mortgage Penalty Calculator

Find out how much it costs to break your Canadian mortgage early. Calculates both 3-month interest and Interest Rate Differential (IRD) penalties.

Outstanding Balance

Your Contract Rate

Current Lender Posted Rate

Months Remaining in Term

Estimated Penalty

CA$13,125

Based on IRD (whichever is greater)

3-Month Interest

CA$4,758

IRD Penalty

CA$13,125

Rate Differential

1.25%

Months Remaining

36 months

Which penalty applies?
The lender charges the greater of: 3-month interest (CA$4,758) or IRD (CA$13,125). Variable-rate mortgages typically only face the 3-month interest penalty. This is an estimate — contact your lender for the exact amount.

How to Use the Mortgage Penalty Calculator

Enter your Outstanding Balance, your current Contract Rate, the lender's Current Posted Rate for a similar term, and the Months Remaining in your term. The calculator computes both the 3-month interest penalty and the IRD, then shows you the applicable (higher) penalty.

This estimate is directional — your actual penalty may differ based on how your lender calculates IRD (some use the discounted rate, not the posted rate). Always confirm with your lender before breaking a mortgage.

Penalty Calculation Formulas

3-Month Interest Penalty:
= Balance × Monthly Rate × 3
Monthly Rate = (1 + Annual Rate / 2)^(1/6) - 1

Interest Rate Differential (IRD):
= Balance × (Your Rate - Current Posted Rate) × (Months Remaining / 12)

Applicable Penalty = Greater of the two

Variable-rate mortgages in Canada typically only face the 3-month interest penalty. Fixed-rate mortgages face the greater of 3-month interest or IRD — and when interest rates have fallen since you got your mortgage, the IRD is almost always larger.

Example: Breaking a Fixed Mortgage Early

Ottawa Homeowner Refinancing After Rate Drop

Mortgage Balance	$420,000
Original Rate (5-yr fixed)	5.50%
Current Posted Rate (3-yr)	4.25%
Months Remaining	30
3-Month Interest Penalty	$5,792
IRD Penalty	$16,625
Applicable Penalty	$16,625 (IRD)

Even though they'd save $400/month by refinancing at 4.25%, the penalty takes 41+ months to recoup. Breaking the mortgage only makes sense if they plan to stay long-term or get a much larger rate reduction.

Frequently Asked Questions

Canadian banks use their posted rates (not the discounted rate you received) in the IRD calculation. Since posted rates are typically 1-2% higher than actual rates, the IRD denominator is inflated. Credit unions and some monoline lenders use the discounted rate, resulting in lower penalties.

Some open mortgages allow breaking without penalty, but carry higher interest rates. Portability lets you move your mortgage to a new property without penalty. Many mortgages also have prepayment privileges (typically 10-20% of original balance per year) that reduce the remaining balance and future penalty.

If you sell and don't port the mortgage, the full penalty applies. If you sell and buy a new home at the same time, you can often port your mortgage to the new property, avoiding the penalty. Some lenders also offer blend-and-extend options to avoid breaking costs.

If the property is an investment property (rental), the mortgage penalty may be deductible as a financing expense, claimed over 5 years. For a principal residence, the penalty is not tax deductible in Canada. Always consult a tax professional for your specific situation.