Mortgage rates change constantly, and if rates drop significantly during your term, you may wonder whether it makes sense to renew early. The answer depends on the math — specifically whether your interest savings outweigh the penalty. Here is how to evaluate every option.
Early renewal options in Canada
You have three main paths to an early renewal:
| Option | How It Works | Penalty | Best When |
|---|---|---|---|
| Break and renew | Pay the penalty, get a new mortgage at current rates | Full penalty (3-month interest or IRD) | Rates dropped significantly, penalty is small |
| Blend-and-extend | Lender blends old and new rate, extends term | No penalty | Rates dropped moderately, want to avoid penalty |
| 120-day window | Renew within 4 months of maturity, no penalty | None | Term is almost up |
| Port and renew | Move your mortgage to a new property | None (if porting within allowed window) | You are moving homes |
Option 1: Break your mortgage and renew
How it works
You terminate your current mortgage contract, pay the prepayment penalty, and sign a new mortgage at current market rates. This gives you the best available rate but requires paying the penalty upfront (or adding it to your new mortgage balance).
Prepayment penalty types
| Mortgage Type | Penalty Calculation | Typical Amount |
|---|---|---|
| Variable rate | 3 months interest | $3,000–$7,000 on $400K–$600K |
| Fixed rate | Greater of: 3 months interest OR interest rate differential (IRD) | $3,000–$25,000+ depending on rate gap and time remaining |
Three months interest penalty
Simple to calculate:
$$\text{Penalty} = \text{Balance} \times \frac{\text{Annual Rate}}{12} \times 3$$
Example: $450,000 balance × (5.50% ÷ 12) × 3 = $6,188
Interest rate differential (IRD) penalty
More complex and typically much higher:
$$\text{IRD} = \text{Balance} \times (\text{Your Rate} - \text{Comparison Rate}) \times \text{Remaining Term in Years}$$
The comparison rate varies by lender — some use the posted rate for the remaining term, others use the discounted rate. This creates enormous variation in penalties between lenders.
Example: $450,000 × (5.50% − 4.00%) × 2.5 years remaining = $16,875
Big 5 bank IRD calculation methods
| Lender | Comparison Rate Used | Impact |
|---|---|---|
| RBC | Posted rate minus your original discount | Higher penalty |
| TD | Posted rate for remaining term | Higher penalty |
| BMO | Posted rate for remaining term | Higher penalty |
| Scotiabank | Posted rate minus original discount | Higher penalty |
| CIBC | Posted rate for remaining term | Higher penalty |
| Monoline lenders | Discounted rate for remaining term | Lower penalty |
This is why many mortgage brokers recommend monoline lenders — their IRD penalties are typically 50–75% lower than Big 5 bank penalties because they use the actual discounted rate rather than the inflated posted rate.
Option 2: Blend-and-extend
How it works
Your lender combines your existing rate with the current rate and extends your term. No penalty is charged because you are not breaking the contract — you are modifying it.
Blended rate calculation
$$\text{Blended Rate} = \frac{(\text{Old Rate} \times \text{Remaining Months}) + (\text{New Rate} \times \text{Extension Months})}{\text{Total New Term Months}}$$
Example
| Detail | Value |
|---|---|
| Current rate | 6.00% |
| Remaining term | 2 years (24 months) |
| Current 5-year rate | 4.50% |
| New term | 5 years (60 months) |
$$\text{Blended Rate} = \frac{(6.00% \times 24) + (4.50% \times 36)}{60} = \frac{144 + 162}{60} = 5.10%$$
Your new rate: 5.10% for 5 years (vs 6.00% for 2 years then market rate for 3+ years).
Blend-and-extend pros and cons
| Pros | Cons |
|---|---|
| No penalty | Blended rate is higher than current market rate |
| Immediate payment reduction | Locked into a new 5-year term |
| Simple process | Cannot switch lenders — only your current lender offers blend-and-extend |
| No legal fees or appraisal | May miss out on even lower rates if rates continue to drop |
Option 3: The 120-day early renewal window
How it works
Most lenders send a renewal offer approximately 120 days before your mortgage maturity date. During this window, you can:
- Accept the renewal offer (often not their best rate)
- Negotiate a lower rate with your current lender
- Get competing quotes and use them as leverage
- Switch to a different lender without penalty
Timeline
| Months Before Maturity | Action |
|---|---|
| 6 months | Start monitoring rates and getting quotes |
| 4 months (120 days) | Renewal offer arrives — begin negotiating |
| 3 months | Get competing quotes, submit applications to other lenders |
| 1 month | Finalize decision, sign renewal or new mortgage |
| Maturity date | New term begins |
Critical warning: do not just sign the renewal letter
Your lender’s initial renewal offer is almost never their best rate. It is a starting point for negotiation. Studies suggest 60–70% of Canadians simply sign the renewal letter without negotiating — leaving hundreds or thousands of dollars on the table.
| Scenario | 5-Year Rate | Monthly Payment ($400K) | 5-Year Cost |
|---|---|---|---|
| Sign renewal letter as-is | 5.50% | $2,456 | $147,360 |
| Negotiate with current lender | 5.10% | $2,374 | $142,440 |
| Switch to best available lender | 4.80% | $2,312 | $138,720 |
| Savings from negotiating | — | $144/month | $8,640 over 5 years |
Break-even calculation: should you renew early?
The formula
$$\text{Break-even (months)} = \frac{\text{Penalty}}{\text{Monthly Savings}}$$
If the break-even is less than the remaining months on your current term, early renewal saves money.
Detailed example
| Detail | Current Mortgage | After Early Renewal |
|---|---|---|
| Balance | $400,000 | $400,000 |
| Current rate | 6.00% | 4.50% |
| Monthly payment | $2,590 | $2,200 |
| Monthly savings | — | $390 |
| Remaining term | 3 years (36 months) | — |
| Penalty (IRD) | — | $12,000 |
$$\text{Break-even} = \frac{$12{,}000}{$390/\text{month}} = 30.8 \text{ months}$$
Since you have 36 months remaining and break-even is 30.8 months, you will save money — but only $390 × (36 − 30.8) = $2,028 net savings over the remaining term.
When the math clearly works
| Rate Drop | Penalty Type | Time Remaining | Verdict |
|---|---|---|---|
| 1.5%+ | 3-month interest (variable) | 2+ years | Almost always worth it |
| 1.5%+ | IRD (fixed) | 3+ years | Calculate carefully — IRD may be large |
| 0.50–1.0% | 3-month interest | 3+ years | Likely worth it |
| 0.50–1.0% | IRD (fixed) | 2+ years | Often not worth it — IRD eats savings |
| < 0.50% | Any | Any | Rarely worth it |
Blend-and-extend vs break-and-renew comparison
$400,000 mortgage, current rate 6.00%, 2.5 years remaining, current 5-year rate 4.50%
| Option | New Rate | Monthly Payment | Penalty | 5-Year Total Cost |
|---|---|---|---|---|
| Do nothing (2.5 years at 6%, then renew at estimated 4.50%) | 6.00% then 4.50% | $2,590 → $2,200 | $0 | ~$145,000 |
| Blend-and-extend (blended to ~5.10% for 5 years) | 5.10% | $2,374 | $0 | ~$142,440 |
| Break and renew (penalty + 4.50% for 5 years) | 4.50% | $2,200 | $12,000 | ~$144,000 |
In this scenario, blend-and-extend produces the lowest total cost because the IRD penalty makes breaking the mortgage expensive. But if the penalty were only $4,000 (variable rate), breaking and renewing would win.
Step-by-step decision process
Step 1: Get your penalty quote
Call your lender and ask: “What is my prepayment penalty if I pay off my mortgage today?” Get the exact number in writing.
Step 2: Get current rates
Shop rates from your lender, a mortgage broker, and at least one competitor. Use the lowest rate for your calculations.
Step 3: Calculate monthly savings
$$\text{Monthly savings} = \text{Current payment} - \text{New payment at lower rate}$$
Step 4: Calculate break-even
$$\text{Break-even} = \frac{\text{Penalty}}{\text{Monthly savings}}$$
Step 5: Compare to remaining term
- Break-even < remaining term → Early renewal saves money
- Break-even > remaining term → Wait for your renewal window
Step 6: Ask about blend-and-extend
If the penalty makes breaking uneconomical, ask your lender about blend-and-extend. Compare the blended rate savings to the break-and-renew option.
Step 7: Consider switching lenders
At renewal (120-day window), you can switch lenders with no penalty. The new lender typically covers legal and appraisal costs. Always compare.
Common mistakes
| Mistake | Why It Costs You |
|---|---|
| Not checking penalty before deciding | The penalty may be much larger (or smaller) than expected |
| Assuming blend-and-extend is always best | Sometimes paying the penalty yields a lower total cost |
| Ignoring monoline lenders | Their penalties are drastically lower than Big 5 banks |
| Signing the renewal letter without negotiating | Lenders expect negotiation — the first offer is never the best |
| Not accounting for legal fees when switching lenders | Most new lenders cover these, but confirm |
| Forgetting about the stress test | Even at renewal with a new lender, the stress test applies |