Three months of interest
The prepaid amount is multiplied by the annual contract rate and three twelfths.
Specialized Financial Planning Calculators
Mortgage Penalty Calculator Canada
Estimate three months of interest, an illustrative interest rate differential, the selected mortgage penalty, and total exit cost including entered fees.
Three-month interest estimateTwo IRD methodsHigher-of comparisonExit-cost breakdown
Calculation inputs
Estimate a mortgage prepayment charge
Compare three months of interest with an illustrative interest-rate-differential calculation and add known discharge or administration fees.
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months
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IRD comparison-rate assumptions
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How the calculation works
Understand the formula before relying on the result
Interest rate differential
The prepaid amount is multiplied by the positive annual rate difference and the fraction of a year remaining in the term.
Comparison-rate method
Users can compare the contract rate directly with a benchmark or reduce a current posted rate by the original posted-rate discount.
Select the penalty
The calculator can use the greater amount, three months of interest alone, or IRD alone, then add entered discharge and administration fees.
Interpret the result
The lender quote controls
Contracts differ on benchmark rates, posted-rate discounts, remaining-term matching, rounding, and minimum charges.
Timing can change the result
The comparison rate and months remaining can move, sometimes materially changing an IRD estimate.
Penalty is not the full decision
Refinancing savings, new fees, cashback repayment, legal costs, portability, and qualification must also be considered.
Partial prepayments may help
Unused annual privileges can sometimes reduce the balance subject to a penalty, depending on the contract and timing.
Common mistakes
- Assuming every closed mortgage uses the same formula.
- Using the full balance when only part is being prepaid—or the reverse.
- Ignoring the original posted-rate discount method.
- Comparing the penalty without new financing costs and interest savings.
- Proceeding without a current written payout statement.
What lenders review
- Mortgage type, open or closed status, and fixed or variable rate.
- Prepayment privileges already used during the contract year.
- Contract rate, posted rate, original discount, and comparison rate.
- Months remaining and lender term-matching rules.
- Portability, blend options, cashback clauses, and discharge fees.
Planning tips
- Request a written payout statement with an expiry date.
- Ask the lender to explain each rate used in the calculation.
- Use available prepayment privileges before payout only after confirming contract treatment.
- Compare the penalty with refinance break-even and total term savings.
- Model waiting one or more months if timing is flexible.
Connected HopeWell knowledge
Connect the mortgage penalty calculator to the mortgage decision
Use the result alongside HopeWell's guide chapters, glossary definitions, real underwriting case studies, service pages, and related calculators.
Calculation pathway
Related mortgage calculators
Continue into qualification, purchase costs, equity, refinancing, HELOC planning, and mortgage comparison using the connected calculators below.
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Interest Rate Differential Calculator
Estimate IRD using direct comparison-rate or posted-rate-discount methods and show the rate differential and monthly equivalent cost.
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Mortgage Refinancing Calculator Canada
Compare current and proposed mortgage payments, cash out, closing costs, LTV, interest, and break-even.
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Mortgage Renewal Calculator Canada
Model renewal payment shock, lump sums, amortization choices, term interest, and the benefit of keeping a higher payment.
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Mortgage Comparison Calculator Canada
Compare two mortgage offers by payment, term interest, principal, renewal balance, fees, cash back, and net cost.
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Mortgage Lump Sum Calculator
Compare keeping the payment or recasting after a lump sum, with interest savings and amortization reduction.
Frequently asked questions
Questions about this calculation
Is a mortgage penalty always three months of interest?
No. Many closed fixed-rate mortgages use the greater of three months of interest and an IRD, while variable-rate, open, and other products may use different terms.
What amount is subject to the penalty?
It may be the amount prepaid beyond available privileges or the full payout amount, depending on the transaction and contract.
Why is the lender's IRD different?
Lenders may use different posted rates, discounted rates, benchmark terms, calculation dates, and rounding conventions.
Can the penalty change before closing?
Yes. Remaining time decreases and comparison rates can change, so payout statements usually have a limited validity period.
Should I break my mortgage?
The penalty is only one factor. Compare the new mortgage's rate, fees, amortization, qualification, cash flow, and total cost.