Mortgage Prepayment Penalty Calculator
How Canadian Mortgage Prepayment Penalties Work
If you break your mortgage before the term ends — to refinance, sell your home, or access equity — your lender will charge a prepayment penalty. For fixed-rate mortgages, this is calculated as the greater of three months' interest or the Interest Rate Differential (IRD). For variable-rate mortgages, it is typically just three months' interest.
What Is the Interest Rate Differential (IRD)?
The IRD compensates the lender for the difference between your contracted rate and what they can lend that money out for today. The formula is:
IRD = Outstanding Balance × (Your Rate – Current Comparable Rate) × Remaining Term in Years
The "comparable rate" used varies by lender. Banks often use their posted rate minus any discount you received, which can significantly inflate the penalty. Monoline lenders typically use the actual market rate, resulting in much lower IRD penalties.
IRD vs. 3-Month Interest Penalty
| Penalty Type | When It Applies | Typical Amount | Lender Type |
|---|---|---|---|
| 3-Month Interest | Variable rate mortgages; fixed when rates have risen | $3,000–$8,000 | All lenders |
| IRD (Bank Method) | Fixed rate when rates have fallen | $100–$40,000+ | Big 6 banks |
| IRD (Monoline Method) | Fixed rate when rates have fallen | $5,000–$15,000 | Monoline lenders |
When Does Breaking Your Mortgage Make Sense?
Despite the penalty, breaking your mortgage can be worthwhile in these situations:
- Rate savings exceed penalty: If the monthly savings from a lower rate exceed the penalty cost within a reasonable timeframe (2-3 years), breaking makes sense.
- Accessing equity: If you need to refinance for a home renovation, consolidate high-interest debt, or fund other goals, the savings on other debt may outweigh the penalty.
- Home sale: When selling your home, you typically must break the mortgage unless you port it to the new property.
Calculate your break-even point: divide the penalty by your monthly savings to find how many months until you recover the cost.
How to Reduce or Avoid Prepayment Penalties
- Wait for term end: The most obvious solution — simply renew at the end of your term.
- Use prepayment privileges first: Most mortgages allow 10-20% lump-sum annual prepayments without penalty. Use these to reduce the principal before breaking the mortgage.
- Port your mortgage: If buying a new home, porting transfers your current mortgage to the new property, avoiding penalties.
- Choose monoline lenders: When getting a new mortgage, monolines (like MCAP, First National) use fairer IRD calculations than the Big 6 banks.
- Blended rate extension: Some lenders offer to blend your current rate with the new rate rather than breaking, avoiding the full penalty.
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