A mortgage refinance breakeven calculator determines how long it takes for the monthly interest savings from a lower rate to offset the cost of breaking an existing mortgage. The key cost for Canadian borrowers is the prepayment penalty, which for fixed-rate mortgages is typically the Interest Rate Differential (IRD).
Breakeven Formula
Breakeven months = Total refinancing costs / Monthly payment reduction
Total refinancing costs = Prepayment penalty + Legal fees + Appraisal + Title insurance + Any origination fees
Monthly payment reduction = Current payment − New payment (both calculated on the same outstanding balance and term)
Interest Rate Differential (IRD) Calculation
For fixed-rate mortgages, the IRD is the larger of the 3-month interest penalty or the differential penalty. The IRD formula used by most major Canadian banks:
IRD = Outstanding balance × (Contract rate − Comparison rate) × Remaining years
The comparison rate is the current posted rate for the term closest to your remaining term. Banks set comparison rates internally and these can vary. The Financial Consumer Agency of Canada (FCAC) notes that major bank IRD calculations often use posted rates (not discounted rates) as the comparison, which can produce larger penalties than monoline lender calculations.
Example: $400,000 outstanding, contract rate 5.5%, comparison rate 4.2%, 2.5 years remaining.
IRD = $400,000 × 1.3% × 2.5 = $13,000. Three-month interest = $400,000 × 5.5% / 4 = $5,500. Penalty = $13,000.
Variable-Rate vs. Fixed-Rate Penalty Comparison
| Mortgage Type | Prepayment Penalty | Typical Range (on $400K) |
|---|---|---|
| Variable rate (closed) | 3 months interest | $4,500 to $7,000 |
| Fixed rate (closed) | Greater of 3 months interest or IRD | $6,000 to $25,000+ |
| Open mortgage (any rate) | None | $0 |
Refinancing Costs Beyond the Penalty
Discharge of the existing mortgage requires a lawyer or notary to remove the charge from title and register the new mortgage. Legal/notarial fees for a refinance typically run $700 to $1,500 in most provinces. Quebec notarial fees are governed by a schedule and often slightly higher. An appraisal is required by the new lender if switching institutions ($300 to $600). Title insurance for a refinance costs approximately $200 to $350.
Refinancing with the Same Lender
Many lenders offer an early renewal (blend-and-extend) option that avoids the full IRD penalty by blending the current rate with the new rate for an extended term. The blended rate is a weighted average: (current balance × current rate + incremental amount × new rate) / total balance. This typically results in a rate between the current contract rate and the new market rate, which may or may not be advantageous compared to a full break with penalty.
OSFI Stress Test on Refinance at New Lender
Switching to a new lender at renewal triggers the stress test: the borrower qualifies at the higher of the offered rate plus 2%, or 5.25%. A borrower renewing with the same lender does not face the same formal stress test requirement, though lenders may apply internal underwriting standards. This difference can affect refinancing decisions for borrowers whose income or debt levels have changed.
Source
FCAC Mortgage Prepayment Penalty information; OSFI Guideline B-20; ITA s.20(1)(e) (financing cost deductibility); Bank Act provisions on prepayment disclosure.
Frequently asked questions
- When does it make sense to refinance my mortgage in Canada?
- Refinancing makes sense when the interest savings over the remaining mortgage term exceed the prepayment penalty and other refinancing costs. The breakeven point is when cumulative monthly savings equal total refinancing costs. If you plan to keep the mortgage past the breakeven date, refinancing is financially beneficial at the new rate. If you will sell or pay out before that date, refinancing costs more than it saves.
- What is a mortgage prepayment penalty in Canada?
- Canadian lenders charge a prepayment penalty when a borrower breaks a closed mortgage before the end of the term. For variable-rate mortgages, the penalty is typically 3 months of interest on the outstanding balance. For fixed-rate mortgages, the penalty is the greater of 3 months of interest or the Interest Rate Differential (IRD). The IRD is calculated as: outstanding balance x (contract rate minus comparison rate) x remaining months / 12.
- How is the Interest Rate Differential (IRD) calculated in Canada?
- IRD = outstanding balance x (contract rate - comparison rate) x remaining term in years. The comparison rate is the lender's current posted rate for a term matching your remaining term. For example: $400,000 balance, contract rate 5.5%, comparison rate 4.0%, 3 years remaining: IRD = $400,000 x (5.5% - 4.0%) x 3 = $18,000. IRD penalties at major banks can substantially exceed the 3-month interest calculation when the contract rate is significantly above current rates.
- What other costs should I include in a refinance breakeven calculation?
- Beyond the prepayment penalty, costs may include: appraisal fee ($300 to $600), legal/notarial fees to discharge and re-register the mortgage ($700 to $1,500 in most provinces), title insurance (approximately $200 to $350 for refinances), mortgage default insurance premium if LTV exceeds 80% after refinance (CMHC, Sagen, or Canada Guaranty: 0.6% to 4% of insured amount), and potentially a reinstatement or origination fee at the new lender ($0 to $750).
- Can I refinance to a higher mortgage amount in Canada?
- Yes. Cash-out refinancing (refinancing to a higher principal than the existing balance) is available on uninsured mortgages (conventional, with at least 20% equity). The maximum refinance LTV is 80% of the current appraised value under OSFI Guideline B-20. Cash-out is not available on insured (high-ratio) mortgages. The new higher principal is subject to the stress test at the new lender.
- How does the mortgage stress test apply to a refinance in Canada?
- When refinancing at a new lender, the borrower must requalify under the OSFI stress test: qualifying rate = max(contract rate + 2%, 5.25%). Existing lenders switching their own borrowers to a new rate or term (without a new mortgage) are not required to apply the stress test, though many do as internal policy. This asymmetry can influence whether refinancing with the same lender or switching to a new lender is advantageous.
- What is the breakeven period for a typical Canadian mortgage refinance?
- A rough estimate: breakeven months = total refinancing costs / monthly payment reduction. For example, $12,000 total penalty and costs, and a monthly payment reduction of $300: breakeven = 40 months. A borrower with more than 40 months remaining on a 5-year term would benefit from refinancing; a borrower with 24 months remaining would not.
- Are there no-penalty mortgage options in Canada?
- Open mortgages allow full repayment or refinancing at any time without penalty but charge higher interest rates (typically 1% to 2% above closed rates). Variable-rate closed mortgages carry only a 3-month interest penalty, which is generally far lower than a fixed-rate IRD penalty. Portability provisions allow moving a mortgage to a new property without triggering a penalty if the same lender is used and the new property is purchased simultaneously.
- Is the mortgage prepayment penalty tax deductible in Canada?
- If the refinanced property is a rental or income-producing property, the prepayment penalty may be deductible as a financing cost under ITA s.20(1)(e) spread over 5 years (or the term of the new loan, if shorter). For a principal residence, the penalty is not deductible. A tax professional should confirm deductibility based on the specific facts.
- Can I avoid the prepayment penalty by porting my mortgage?
- Porting transfers the existing mortgage rate and balance to a new property without breaking the contract. If the new property's purchase price exceeds the current mortgage balance, the incremental amount is blended or taken as a new mortgage at current rates. Porting avoids the IRD penalty only if the existing home sells and the new home closes simultaneously or within the lender's required window (typically 30 to 90 days).