Breaking a Fixed Mortgage in Canada: IRD Penalty Guide (2026)
Published: 2026-10-24 · Verified: 2026-10-25 · Author: usecos.app Research & Engineering · Verified against methodology and sources
Direct answer: When you break a closed fixed-rate mortgage in Canada before the end of your term, the lender charges the greater of 3 months' simple interest OR the Interest Rate Differential (IRD). While variable-rate mortgages are capped at 3 months' interest, major Canadian chartered banks calculate fixed-rate IRD using inflated original posted rates and strip back your original rate discount—frequently turning a $4,500 interest penalty into an $18,000 to $28,000+ IRD charge.
Primary sources: FCAC: Mortgage prepayment penalties; FCAC: Breaking a mortgage contract; Interest Act (R.S.C., 1985, c. I-15), Section 10.
Compare your exact 3-month interest vs Big-6 posted-rate IRD vs fair-value mono-line IRD in our Mortgage Prepayment Penalty Calculator, and test whether refinancing still pays off in our Canadian Mortgage Calculator and Mortgage Renewal & Switch Guide.
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Side-by-side worked example: breaking a $500,000 fixed mortgage with 2 years left
Primary sources: FCAC: Mortgage prepayment penalties; Interest Act, section 6.
Suppose you have a $500,000 remaining mortgage balance on a 5-year fixed contract at 4.99% with 24 months (2 years) remaining. When you signed 3 years ago, the bank's 5-year posted rate was 6.79% (meaning you received a 1.80% discount). Today, the current 2-year rate is 3.89% commercial / 5.29% posted. Look at the massive difference between the three penalty methods:
| Penalty Calculation Method | Rate Comparison Used | Formula on $500,000 (24 Months Left) | Estimated Prepayment Penalty |
|---|---|---|---|
| 3 Months' Simple Interest (Variable Floor) | Contract rate (4.99%) for 3 months | $500,000 × 4.99% × (3 ÷ 12) | $6,237.50 |
| Fair-Value / Mono-Line IRD | Contract (4.99%) vs current 2-yr rate (3.89%) = 1.10% spread | $500,000 × 1.10% × 2 years | $11,000.00 |
| Big-6 Bank Posted-Rate Discounted IRD | Contract (4.99%) vs (5.29% posted − 1.80% discount = 3.49%) = 1.50% spread | $500,000 × 1.50% × 2 years | $15,000.00 |
Why the Big-6 formula costs $4,000 to $12,000+ more: Instead of comparing your 4.99% contract rate to the 3.89% rate the bank actually charges new 2-year borrowers today, a posted-rate lender subtracts your original 5-year rate discount (1.80%) from today's 2-year posted rate (5.29%), creating an artificially low comparison rate (3.49%) and widening the penalty spread.
Section 10 of the Canada Interest Act and prepayment privileges
Primary sources: Interest Act (R.S.C., 1985, c. I-15), Section 10; FCAC: Mortgage prepayment penalties.
Before paying a full IRD quote, check three legal and contractual mechanisms that can dramatically cut your mortgage break cost:
- Exercise your annual 10%–20% lump-sum prepayment privilege FIRST: Most closed Canadian mortgages allow you to prepay 10%, 15%, or 20% of your original mortgage principal once per year without penalty. If your original balance was $550,000 and your contract allows a 20% annual lump sum ($110,000), applying that privilege (or instructing your real estate lawyer to verify whether your lender automatically deducts remaining annual prepayment room on payout) reduces the principal balance subject to the IRD calculation by $110,000—saving thousands immediately.
- Porting your mortgage when buying a new home: If you are selling your current home and buying another property within 30 to 120 days, ask your lender about porting (transferring) your existing mortgage rate and term to the new property, or executing a blend-and-extend so the IRD penalty is refunded or waived.
- The 5-Year Rule under Section 10 of the Canada Interest Act: Under Section 10(1) of the federal Interest Act, whenever an individual's mortgage has a term of more than 5 years (for example, a 7-year or 10-year fixed mortgage) and 5 full years have elapsed, the borrower has the statutory right to pay off the entire balance by tendering principal plus 3 months' interest only—meaning the lender is legally barred from charging an IRD penalty after year 5.
Methodology and limitations
Penalty formulas follow the Financial Consumer Agency of Canada (FCAC) Code of Conduct for Federally Regulated Financial Institutions (Mortgage Prepayment Information Disclosures) and Section 10 of the federal Interest Act (R.S.C., 1985, c. I-15). Individual lenders may also add a mortgage discharge / reassignment administration fee ($75–$400 depending on province) and claw back any cash-back incentive earned at origination on a pro-rated basis. Always request a written payout statement from your lender before signing a refinance commitment. This guide is for educational estimation and does not constitute financial or legal advice. Verified October 25, 2026.
Sources: FCAC: Mortgage Prepayment Penalties; FCAC: Breaking Your Mortgage Contract; Interest Act (R.S.C., 1985, c. I-15), Section 10.
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