With the Bank of Canada cutting rates from 5.00% to 2.75% between June 2024 and March 2026, millions of Canadians with fixed-rate mortgages at 5%–6% are asking the same question: should I break my mortgage and lock in at a lower rate? The answer comes down to one calculation.
The break-even calculation
Breaking your mortgage only makes sense if the interest you save exceeds what it costs you to break.
Formula:
(Penalty + fees) ÷ monthly interest savings = months to break even
If you break even within the first 12–24 months of a new 5-year term, breaking is almost certainly worth it. If the break-even is 36+ months, blending and extending or waiting for renewal may be better.
Step-by-step: Run the numbers
Step 1: Find your penalty
Call your lender and ask for your exact prepayment penalty. They are required to provide it. While you wait, estimate it:
| Mortgage Type | Penalty Formula | Example ($400K balance) |
|---|---|---|
| Variable rate | 3 months interest | $400K × 5.00% ÷ 12 × 3 = $5,000 |
| Fixed rate (3-month) | 3 months interest | $400K × 5.50% ÷ 12 × 3 = $5,500 |
| Fixed rate (IRD) | Balance × rate differential × remaining years | $400K × 1.50% × 3 = $18,000 |
Your penalty is the greater of 3-month interest or IRD (for fixed-rate mortgages).
Step 2: Calculate your monthly savings
| Detail | Current Mortgage | New Mortgage |
|---|---|---|
| Balance | $400,000 | $400,000 |
| Rate | 5.50% | 4.00% |
| Amortization | 22 years remaining | 25 years (reset) |
| Monthly payment | $2,518 | $2,104 |
| Monthly interest portion | ~$1,833 | ~$1,333 |
| Monthly interest savings | $500 |
Step 3: Calculate break-even
| Scenario | Penalty | Monthly Savings | Break-Even |
|---|---|---|---|
| Variable-rate break | $5,000 | $500 | 10 months |
| Fixed-rate (3-month interest) | $5,500 | $500 | 11 months |
| Fixed-rate (IRD) | $18,000 | $500 | 36 months |
Step 4: The verdict
| Break-Even Period | Recommendation |
|---|---|
| Under 12 months | Break it — you save for nearly the entire new term |
| 12–24 months | Likely worth it — calculate total net savings over the full term |
| 24–36 months | Marginal — consider blend and extend instead |
| Over 36 months | Probably not worth it — wait for renewal or blend and extend |
Real scenarios: 2026 rate environment
Scenario 1: Variable rate at 5.00%, switching to fixed at 4.00%
| Detail | Value |
|---|---|
| Balance | $450,000 |
| Current rate | 5.00% (variable) |
| New rate | 4.00% (5-year fixed) |
| Penalty (3 months interest) | $5,625 |
| Discharge fee | $300 |
| New lender legal fee | $0 (many lenders cover this) |
| Total cost to break | $5,925 |
| Monthly interest savings | ~$375 |
| Break-even | 16 months |
| Net savings over 5-year term | $16,575 |
Verdict: Break it. You recoup the cost in 16 months and save $16,575 over 5 years.
Scenario 2: Fixed rate at 5.75%, big bank IRD penalty
| Detail | Value |
|---|---|
| Balance | $350,000 |
| Current rate | 5.75% (big bank fixed) |
| Remaining term | 3.5 years |
| New rate | 4.25% (5-year fixed) |
| IRD penalty (posted rate method) | $22,000 |
| Discharge fee | $300 |
| Total cost to break | $22,300 |
| Monthly interest savings | ~$437 |
| Break-even | 51 months |
| Net savings over 5-year term | $3,920 |
Verdict: Don’t break. The IRD is too high. Wait for renewal or consider blend and extend.
Scenario 3: Fixed rate at 5.25%, monoline lender
| Detail | Value |
|---|---|
| Balance | $400,000 |
| Current rate | 5.25% (monoline lender fixed) |
| Remaining term | 2.5 years |
| New rate | 4.10% (5-year fixed) |
| IRD penalty (contract rate method) | $11,500 |
| Discharge fee | $250 |
| Total cost to break | $11,750 |
| Monthly interest savings | ~$383 |
| Break-even | 31 months |
| Net savings over 5-year term | $11,230 |
Verdict: Marginal. You save over the 5-year term, but it takes 31 months to break even. Blend and extend may be a better option to avoid the cash outlay.
Why big bank penalties are higher
Big banks (RBC, TD, BMO, Scotiabank, CIBC) calculate IRD using their posted rates, which are higher than the rates you actually negotiated.
| Factor | Big Bank | Monoline Lender |
|---|---|---|
| Rate used in IRD | Posted rate (e.g., 6.79%) | Your contract rate (e.g., 5.25%) |
| Discount in calculation | Your discount is subtracted from the comparison rate | No discount adjustment |
| Result | Higher IRD penalty | Lower IRD penalty |
| Typical difference | 40%–100% higher penalty | — |
Example: On a $400,000 mortgage with 3 years remaining:
- Big bank IRD: $18,000–$22,000
- Monoline lender IRD: $10,000–$14,000
This is why your choice of lender at signing matters for the entire term, not just the rate.
Alternatives to breaking your mortgage
Blend and extend
Your current lender combines your existing rate with today’s rate and extends your term. No penalty, but the blended rate will be higher than the best available market rate.
| Pros | Cons |
|---|---|
| No penalty | Blended rate is higher than best available |
| No legal fees | Must stay with current lender |
| Simple process | New term resets (could be a pro or con) |
→ See: Blend and Extend Mortgage Canada
Port your mortgage
If you’re breaking because you’re moving, you may be able to port your existing mortgage to the new property at your current rate.
→ See: How to Port Your Mortgage
Use prepayment privileges first
Most mortgages allow 10%–20% lump-sum payments per year without penalty. Maximizing this before renewal reduces your balance and total interest.
→ See: Mortgage Prepayment Privileges
Wait for renewal
If your renewal is within 6–12 months, the penalty may not be worth it. Start shopping for rates 120 days before renewal — some lenders offer early rate holds.
→ See: Mortgage Renewal Guide
Costs to include in your calculation
Don’t just calculate the penalty — include all costs:
| Cost | Typical Amount |
|---|---|
| Prepayment penalty | Varies (see above) |
| Mortgage discharge fee | $200–$350 |
| New mortgage setup fee | Usually $0 (lender covers) |
| Appraisal fee (if required) | $300–$500 |
| Legal fees (new mortgage) | $500–$1,500 (often covered by new lender) |
| Title insurance | $250–$400 |
| Property tax adjustment | Usually neutral |
Many lenders offer cash-back or cover legal fees to attract switch business. Factor these rebates in.
When to break (and when not to)
| Break | Don’t Break |
|---|---|
| Variable-rate mortgage (low penalty) | Fixed rate with IRD penalty over 36-month break-even |
| Monoline lender with fair IRD calculation | Less than 12 months left in your term |
| Rate drop of 1%+ with 3+ years remaining | Small rate differential (under 0.50%) |
| Need to consolidate high-interest debt | Lender offers competitive blend and extend |
| Selling the property | Planning to sell within 2 years |
Key Takeaways
- The math is simple: (Penalty + fees) ÷ monthly savings = break-even in months. Under 24 months is usually worth it.
- Variable-rate penalties are predictable: always 3 months of interest (~$4,000–$6,000 on a typical mortgage). Breaking a variable mortgage is almost always straightforward math.
- Fixed-rate IRD penalties can be brutal: especially at big banks using posted-rate calculations. Get the exact number from your lender before deciding.
- Big bank vs monoline: the same mortgage, same rate — a big bank penalty can be 40–100% higher than a monoline lender penalty due to how they calculate IRD.
- Blend and extend is a no-penalty alternative: you get a lower rate (though not the best available) without any upfront cost. Good option when the IRD penalty makes breaking uneconomical.
- Current environment: with BoC rates at 2.75% (as of March 2026), many homeowners with 5%+ fixed rates locked in 2022–2023 are strong candidates for breaking — particularly those with variable-rate or monoline-lender mortgages.
Related Reading
- Blended Mortgage Canada — How blend and extend works
- How to Port Your Mortgage — Transfer your rate to a new property
- Mortgage Renewal vs Refinance — Understand your options at renewal
- Pay Off Mortgage Faster — Strategies that save thousands
- Best Time to Renew Mortgage — When to start shopping
- Bank of Canada Interest Rate Explained — How rate decisions affect your mortgage
- Interest Rate Forecast Canada — Where rates are heading
- Mortgage Guide Canada — Comprehensive overview