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Direct answer: In Canada, breaking a variable-rate mortgage incurs a penalty equal to 3 months of interest. Breaking a fixed-rate mortgage costs the greater of 3 months of interest or the Interest Rate Differential (IRD). For Big-5 chartered banks, IRD penalties use posted rate discount clawbacks that often cost 2× to 4× more than fair monoline lenders.
Quick Scenario Presets
Remaining mortgage balance
Your existing interest rate
e.g. 24 months left on 5-yr term
Lender posted rate at start of term (e.g. 6.99%)
Lender posted rate for matching remaining term (e.g. 2-yr posted)
Calculate break-even timeline and net savings from breaking early.
e.g. 4.19% from a new lender or current market promo
Method used: Big-5 Bank Posted Rate IRD (Discount Clawback): Balance × 1.2% × (24/12)
You save approximately $488/month in interest at 4.19%.
Breaking early and switching saves you money over the remaining term.
Why breaking a fixed mortgage at a major Canadian chartered bank costs 3x to 5x more than at a fair monoline lender.
| Lender Category | IRD Calculation Formula | Variable Penalty | Est. Penalty ($500k, 2 Yrs Left) | How to Mitigate / Avoid |
|---|---|---|---|---|
| Big-5 Banks (RBC, TD, BMO, CIBC, Scotiabank) | Posted rate at signing minus current posted comparison rate (Claws back original discount) | 3 Months Interest | $16,500 – $24,000 | Exercise 15%–20% annual prepayment privilege right before requesting final payout statement. |
| Monoline Lenders (MCAP, First National, Merix) | Fair Contract Rate IRD: Actual contract rate minus actual current discounted lending rate | 3 Months Interest | $4,800 – $7,200 | Port existing mortgage to new home, or let buyer assume with qualifying credit. |
| Provincial Credit Unions (Vancity, Meridian, Coast Capital) | Contract IRD or lender policy rate differential (varied by provincial credit union act) | 3 Months Interest | $5,500 – $8,900 | Request penalty abatement if refinancing with an expanded loan balance at the same branch. |
| All Lenders (Variable Rate Mortgage) | Strictly 3 Months of Interest (Federal Bank Act & Interest Act cap) | 3 Months Interest | $6,800 – $7,500 | Variable mortgages never suffer IRD penalties—safe for homeowners planning to sell. |
Turn your penalty calculation into a clear break-or-stay refinancing decision.
Benchmark your bank renewal letter against wholesale broker pricing.
Compare fixed vs variable or 3-year vs 5-year total borrowing costs.
Ensure your household passes the OSFI B-20 stress test to switch lenders.
| Scenario | Inputs | Estimated Penalty | Calculation Note |
|---|---|---|---|
| $400,000 Variable Rate Mortgage (6.00%) | 24 months remaining, Variable rate | $6,000 Penalty (3 Months Interest) | Variable penalties are strictly 3 months interest ($400,000 × 6% / 12 × 3). |
| $500,000 Fixed Rate (5.49%) with Monoline Lender | 24 months remaining, Current comparison rate 4.29% | $12,000 Penalty (Standard IRD) | Rate diff of 1.20% over 2 years: $500,000 × 1.20% × 2 = $12,000 (exceeds $6,862 3-mo interest). |
| $500,000 Fixed Rate (5.49%) with Big-5 Bank | 24 months remaining, Original posted 6.99%, Current posted 5.79% | $18,500+ Penalty (Big-Bank Discount Clawback) | Bank discount calculation expands effective rate spread, increasing prepayment penalty. |
1. Variable Rate 3-Month Formula: Calculated as Penalty = Principal × (Annual Rate / 12) × 3. Under FCAC Prepayment Guidelines, variable mortgages with Canadian federally regulated lenders cannot charge an IRD.
2. Standard IRD Formula: Evaluates the difference between your contract interest rate and the current rate for a term matching your remaining duration: IRD = Principal × (Contract Rate - Comparison Rate) × (Remaining Months / 12). Monoline lenders calculate comparison rates against their fair wholesale discounted offerings.
3. Big-Bank Discount Clawback: When borrowers receive a "discount" off the posted rate (e.g. posted 6.99% discounted to 5.49%), major Canadian banks subtract that original discount from their current posted comparison rate (tracked in Bank of Canada Chartered Bank Posted Rates), artificially expanding the rate spread and multiplying the penalty.
4. Section 10 of Canada's Interest Act: If you have a residential mortgage term exceeding 5 years (such as a 7-year or 10-year term), you have the statutory right under Interest Act s. 10 to prepay the balance in full at any time after the 5th anniversary by paying no more than 3 months interest, overriding lender IRD contracts.
Tactics Canadian homeowners use to reduce or eliminate mortgage breakage fees when refinancing or selling:
| Strategy | Mechanism | Penalty Reduction Impact | Best Applicable Scenario |
|---|---|---|---|
| Lump-Sum Prepayment Before Payout | Exercise your annual 10%–20% lump-sum privilege 1–2 days before requesting the official payout statement. | Slashes penalty by 10%–20% ($1,200–$3,500 saved) | When breaking early and you have accessible liquid cash, TFSA funds, or bridge proceeds. |
| Mortgage Porting to New Home | Transfer existing balance and rate to replacement home; borrow only difference at current rates. | 100% penalty waived (saving full $5,000–$25,000) | Moving to a new property within 30 to 120 days of closing sale of existing home. |
| Mortgage Assumption by Buyer | Buyer legally assumes your low fixed-rate mortgage upon purchase, subject to lender qualification. | Zero penalty paid; highly attractive selling feature | When holding a legacy fixed rate significantly below prevailing market rates. |
| Section 10 Interest Act 5-Year Rule | Residential terms > 5 years (7-yr or 10-yr) can be prepaid after Year 5 at flat 3 months interest. | Prevents massive IRD charges on long-term mortgages | Borrowers locked into long 7- or 10-year contracts seeking early discharge after the 5th anniversary. |
Under Financial Consumer Agency of Canada (FCAC) guidelines, variable-rate mortgages charge 3 months interest. Fixed-rate mortgages charge the greater of 3 months interest or the Interest Rate Differential (IRD). The IRD measures the difference between your contract interest rate and the current rate the lender can lend that money at for the remaining term.
Major Canadian chartered banks (RBC, TD, Scotiabank, BMO, CIBC) use their inflated "posted rates" at contract signing rather than your discounted contract rate to calculate the IRD. When you break early, they claw back your original discount, which can inflate a fixed-rate penalty from $6,000 to over $20,000 on a typical Canadian mortgage.
You can avoid penalties if you port your mortgage to a new property, have the buyer assume your mortgage (if assumable), make prepayment lump sums up to your annual privilege limit (typically 10% to 20%) before requesting payout figures, or wait until renewal (within 30 to 120 days of maturity depending on the lender).
Yes. Under Section 10 of the Canada Interest Act, individual borrowers on a fixed mortgage term longer than 5 years can break the mortgage after the 5th year by paying a maximum penalty of only 3 months interest, regardless of lender IRD formulas.
Breaking a mortgage is financially advantageous when the total interest savings from refinancing into a lower rate over your remaining term exceed the prepayment penalty plus administrative/legal discharge fees. Our calculator displays your break-even month count and net dollar savings.
Direct answer
In Canada, breaking a variable mortgage costs 3 months of interest. Breaking a fixed mortgage costs the greater of 3 months of interest or the Interest Rate Differential (IRD). Big-5 banks use posted rate discount clawbacks that increase penalties significantly.
Interest rates shown on UseCOS tools come from Bank of Canada data and carry the date the Bank published them. Tax figures follow the Canada Revenue Agency's published rules for the tax year shown. Other benchmarks are drawn from OSFI and provincial regulators. Always confirm current figures at the official source.
UseCOS provides transparent educational estimates and math comparisons for personal planning. Tools do not guarantee lender approval, tax compliance, or specific mortgage terms.
For binding mortgage rate commitments, loan contracts, or official tax filings, please consult a licensed Canadian mortgage broker, CPA, or official lender representative.