How is a mortgage prepayment penalty calculated in Canada?

For variable rate mortgages: three months' interest on the outstanding balance. For fixed rate mortgages: the greater of three months' interest or the Interest Rate Differential (IRD). The IRD = (your rate - lender's current rate for the remaining term) x outstanding balance x (remaining months / 12). Lender methodology for the comparison rate varies significantly.

Why are fixed mortgage penalties so much higher than variable?

Fixed mortgage penalties include the IRD, which compensates the lender for lost interest income when you break a below-market loan. If you signed at 4.89% and the lender can only re-lend the money at 3.89%, they lose 1% annually on the outstanding balance for the remaining term. Variable mortgage penalties are only three months' interest because variable rate margins are already adjusting with market conditions.

What is the IRD penalty?

The Interest Rate Differential (IRD) is the lender's estimate of the interest income lost when you prepay a fixed mortgage at a rate above the current market. IRD = (contract rate minus comparison rate) x outstanding balance x remaining years. The comparison rate used varies by lender — major banks often use posted rates, which inflates the IRD significantly.

Can I avoid a mortgage prepayment penalty?

Yes, through several strategies: (1) Use annual prepayment privileges (10-30% of original principal) without penalty; (2) Port the mortgage to a new property instead of discharging it; (3) Wait until the end of the term (renewal carries no penalty); (4) Choose a variable rate or short term (1-2 year fixed) to minimize IRD exposure; (5) Ask the lender about blend-and-extend options.

How much is a typical mortgage prepayment penalty?

For a variable mortgage: approximately $5,000-$8,000 on a $500,000 mortgage (three months' interest at 5%). For a fixed mortgage broken when rates have fallen: $10,000-$50,000 depending on the lender's methodology, the rate drop, and the remaining term. Major bank fixed mortgage penalties are typically higher than monolines because they use posted rates in their IRD calculation.

What is the difference between a posted rate and a discounted rate for penalty purposes?

Posted rates are the lender's advertised rack rates — typically 1-2% higher than the rates actually offered to borrowers. When a major bank calculates IRD, it uses the posted rate for the remaining term as the comparison, then deducts the original discount. This inflates the IRD. Monoline lenders use their actual current rate for the nearest matching term, producing a smaller and more accurate IRD.

What does porting a mortgage mean?

Porting means transferring your existing mortgage rate, balance, and terms to a new property when you move. You avoid the prepayment penalty entirely. If the new property costs more, the additional mortgage amount is typically blended at the current rate. Not all lenders allow porting, and there is usually a bridge period between selling and buying during which the terms are held.

Do I pay a penalty if I sell my home?

Yes, if you sell before the end of the mortgage term. When the property is sold and the mortgage discharged, the lender collects the outstanding balance plus the prepayment penalty. If you are buying another property and your lender allows porting, you may avoid the penalty by porting to the new property.

How do prepayment privileges reduce penalties?

Most closed Canadian mortgages allow annual lump sum payments of 10-30% of the original principal, and/or payment increases of 10-100%, without triggering a penalty. These privileges allow you to reduce the outstanding balance. A lower balance means a smaller penalty if you do eventually break the mortgage.

Is the prepayment penalty tax-deductible?

If the mortgage is on a rental or investment property, the prepayment penalty may be deductible as a financing cost. For a personal residence, the penalty is not deductible. Consult a tax professional regarding the deductibility of prepayment charges on investment properties.

Mortgage Prepayment Penalty Calculator 2025 — Canada

<p>Estimate your mortgage prepayment penalty using either Interest Rate Differential (IRD) or three months’ interest, whichever your lender applies.</p>

Reviewed by Canadian Money Help Editorial Updated April 24, 2026 Source FCAC — Mortgage Prepayment Charges

Loading calculator…

Breaking a Canadian mortgage before the end of the term triggers a prepayment penalty. The amount of the penalty depends on whether the mortgage is fixed or variable, the lender’s methodology, and how interest rates have moved since the mortgage was signed. Prepayment penalties are among the least understood costs of Canadian home ownership and can reach $30,000-$50,000 for fixed mortgages when rates have fallen significantly.

Quick Answer

For a variable rate mortgage, the penalty is three months’ interest on the outstanding balance. For a fixed rate mortgage, the penalty is the greater of three months’ interest or the Interest Rate Differential (IRD). The IRD is the difference between your contract rate and the lender’s current rate for a term matching the remaining time left on your mortgage, multiplied by the outstanding balance and the remaining months.

How the IRD Is Calculated

IRD = (contract rate – comparison rate) x outstanding balance x (remaining months / 12)

The “comparison rate” is where lender methodology diverges:

Posted rate method (major banks): The comparison rate is the lender’s posted rate for the remaining term, discounted by the same amount as your original discount. Because posted rates are substantially higher than actual rates, this method produces large IRD penalties.

Discounted rate method (most monoline lenders): The comparison rate is the lender’s actual current rate for the closest matching term. This produces smaller, more consumer-friendly penalties.

Example: $500,000 balance, 2.5 years remaining, original rate 4.89%. Lender’s current 3-year rate is 4.29%.
IRD = (4.89% – 4.29%) x $500,000 x (30/12) = 0.60% x $500,000 x 2.5 = $7,500

At a major bank using posted rates, the same calculation might yield $25,000+ if their posted rate methodology is applied.

When the Penalty Is Paid

A prepayment penalty is triggered when you:
– Sell the home and discharge the mortgage
– Refinance with any lender
– Prepay more than the allowable annual prepayment privilege (typically 10-30% of original principal)
– Port the mortgage to a new property but increase the loan amount beyond what the existing mortgage covers

How to Reduce or Avoid the Penalty

Use prepayment privileges: Most Canadian mortgages allow annual lump sum payments of 10-30% of original principal and/or payment increases without penalty. These privileges cannot be accumulated across years.

Port the mortgage: If you are buying another property, porting the mortgage transfers the existing rate and terms to the new property. Porting avoids the penalty. If the new property is more expensive, the additional amount is typically blended at the current rate.

Wait until term end: Renewing at maturity carries no prepayment penalty. If you are close to renewal, waiting avoids the cost entirely.

Choose a variable rate or shorter term: Variable mortgage penalties are simpler and usually smaller. A 1 or 2-year fixed term minimizes the IRD exposure by keeping the remaining term short.

Verified Against Source

The Financial Consumer Agency of Canada (FCAC) requires federally regulated mortgage lenders to disclose prepayment penalty calculation methods before contract signing. The calculation methodology must appear in the mortgage agreement. Source: canada.ca/en/financial-consumer-agency/services/mortgages/mortgage-prepayment-charges.html

Edge Cases

CMHC-insured mortgages: The insured status of the mortgage does not affect the prepayment penalty calculation — the lender’s standard penalty methodology applies regardless.

Blend and extend: Some lenders allow you to blend your existing rate with the new rate and extend the term, avoiding a formal penalty. The effective cost is embedded in the blended rate over the new term.

90-day lock-in period: Most mortgages allow prepayment after 90 days from origination. Prepaying within the first 90 days may trigger an additional charge on top of the standard penalty.

Non-federally regulated lenders: Credit unions and private lenders are not subject to FCAC disclosure rules. Penalty methodologies vary widely and may be more punitive.

Frequently asked questions

How is a mortgage prepayment penalty calculated in Canada?: For variable rate mortgages: three months' interest on the outstanding balance. For fixed rate mortgages: the greater of three months' interest or the Interest Rate Differential (IRD). The IRD = (your rate - lender's current rate for the remaining term) x outstanding balance x (remaining months / 12). Lender methodology for the comparison rate varies significantly.
Why are fixed mortgage penalties so much higher than variable?: Fixed mortgage penalties include the IRD, which compensates the lender for lost interest income when you break a below-market loan. If you signed at 4.89% and the lender can only re-lend the money at 3.89%, they lose 1% annually on the outstanding balance for the remaining term. Variable mortgage penalties are only three months' interest because variable rate margins are already adjusting with market conditions.
What is the IRD penalty?: The Interest Rate Differential (IRD) is the lender's estimate of the interest income lost when you prepay a fixed mortgage at a rate above the current market. IRD = (contract rate minus comparison rate) x outstanding balance x remaining years. The comparison rate used varies by lender — major banks often use posted rates, which inflates the IRD significantly.
Can I avoid a mortgage prepayment penalty?: Yes, through several strategies: (1) Use annual prepayment privileges (10-30% of original principal) without penalty; (2) Port the mortgage to a new property instead of discharging it; (3) Wait until the end of the term (renewal carries no penalty); (4) Choose a variable rate or short term (1-2 year fixed) to minimize IRD exposure; (5) Ask the lender about blend-and-extend options.
How much is a typical mortgage prepayment penalty?: For a variable mortgage: approximately $5,000-$8,000 on a $500,000 mortgage (three months' interest at 5%). For a fixed mortgage broken when rates have fallen: $10,000-$50,000 depending on the lender's methodology, the rate drop, and the remaining term. Major bank fixed mortgage penalties are typically higher than monolines because they use posted rates in their IRD calculation.
What is the difference between a posted rate and a discounted rate for penalty purposes?: Posted rates are the lender's advertised rack rates — typically 1-2% higher than the rates actually offered to borrowers. When a major bank calculates IRD, it uses the posted rate for the remaining term as the comparison, then deducts the original discount. This inflates the IRD. Monoline lenders use their actual current rate for the nearest matching term, producing a smaller and more accurate IRD.
What does porting a mortgage mean?: Porting means transferring your existing mortgage rate, balance, and terms to a new property when you move. You avoid the prepayment penalty entirely. If the new property costs more, the additional mortgage amount is typically blended at the current rate. Not all lenders allow porting, and there is usually a bridge period between selling and buying during which the terms are held.
Do I pay a penalty if I sell my home?: Yes, if you sell before the end of the mortgage term. When the property is sold and the mortgage discharged, the lender collects the outstanding balance plus the prepayment penalty. If you are buying another property and your lender allows porting, you may avoid the penalty by porting to the new property.
How do prepayment privileges reduce penalties?: Most closed Canadian mortgages allow annual lump sum payments of 10-30% of the original principal, and/or payment increases of 10-100%, without triggering a penalty. These privileges allow you to reduce the outstanding balance. A lower balance means a smaller penalty if you do eventually break the mortgage.
Is the prepayment penalty tax-deductible?: If the mortgage is on a rental or investment property, the prepayment penalty may be deductible as a financing cost. For a personal residence, the penalty is not deductible. Consult a tax professional regarding the deductibility of prepayment charges on investment properties.

[cw_howto]

Methodology

Variable penalty = 3 months' interest. Fixed penalty = max(3 months' interest, IRD). IRD = (contract rate - comparison rate) x balance x (remaining months / 12). Comparison rate methodology varies by lender (posted vs discounted).