Blend and Extend Mortgage in Canada: How the Blended Rate Works
A blend and extend lets you change your mortgage rate before your term ends without paying a prepayment penalty. The catch is that your old rate does not disappear, because it gets averaged into the new one.
- Rules checked November 13, 2026
- By Krish Paul
- 8 min read
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This guide shows how the blended rate is worked out, what it costs next to waiting or breaking your mortgage, and when each option comes out ahead.
The short answer
A blend and extend is an early renewal where your lender mixes your current rate with today’s rate for a new term, so you skip the prepayment penalty but keep paying part of your old rate. The Financial Consumer Agency of Canada (FCAC) gives a simplified example: a 5.5% mortgage with 24 months left, blended with a 4% five-year rate, becomes 4.6% for the next 60 months.
The FCAC says lenders may allow this option, that you do not pay a prepayment penalty, and that you may pay administrative fees. Your lender must tell you how it calculates your new rate.
Estimate your blended rate
Enter your current rate, the months left on your term and the new 5-year rate your lender quotes. The result updates as you type.
This uses the FCAC’s simplified method for a new 5-year term. Your lender may use a different formula and must tell you how it sets your rate. Calculator by Gizly.
How the blended rate is calculated
The FCAC’s simplified method weights each rate by the number of months it covers in the new term. Using its example of a $200,000 balance, 22 years of amortization left, a 5.5% rate, 24 months to go and a 4% five-year rate:
- Multiply your current rate by the months left on your term: 5.5 x 24 = 132.
- Subtract the months left from the new term: 60 – 24 = 36 months.
- Multiply today’s rate by that difference: 4 x 36 = 144.
- Add the two results: 132 + 144 = 276.
- Divide by the months in the new term: 276 / 60 = 4.6%.
In plain terms, 40% of your new five-year term is priced at your old rate and 60% at today’s rate. The more time you have left on your current term, the closer the blended rate stays to your old rate.
The FCAC labels this a simplified method for illustration. Some lenders use other formulas, so the rate you are offered can differ. Ask for the calculation in writing before you sign.
Blend, wait or break: what each costs
You have three basic choices when your rate no longer fits. You can wait until your term ends and renew then. You can blend and extend now. Or you can break the mortgage, pay the penalty and sign a new term at today’s rate. We ran all three on the FCAC example over the same 60 months, so the totals line up.
| Option | Payment now | Interest, 60 months | Penalty | Total cost |
|---|---|---|---|---|
| Wait, then renew when the term ends | $1,300.54 | $42,733 | $0 | $42,733 |
| Blend and extend now | $1,201.01 | $42,367 | $0 | $42,367 |
| Break, pay three months of interest | $1,136.83 | $36,701 | $2,750 | $39,451 |
| Break, pay an IRD penalty | $1,136.83 | $36,701 | $6,000 | $42,701 |
Hypothetical example built on the FCAC case: $200,000 balance, 22 years of amortization left, monthly payments, interest compounded semi-annually. The wait row assumes you renew at 4%. Administration, appraisal and discharge fees are left out because they vary by lender.
Three things stand out. First, blending and waiting cost almost the same if rates stay put. Waiting and renewing at 4% cost $366 more in interest than blending, which is close to a wash. The blend’s main gain is that your payment drops by about $100 a month right away, and you lock 4.6% for five years instead of facing an unknown rate in two.
Second, breaking is the cheapest option only when the penalty is small. Breaking and taking 4% for the full 60 months saves $5,666 in interest compared with blending. If your total penalty is less than that, breaking wins. If it is more, blending wins.
Third, the penalty decides it, and you will not know it without a quote. The FCAC says the penalty is usually the higher of three months’ interest or the interest rate differential (IRD). On this mortgage, three months of interest is $2,750. The IRD compares the interest left on your term at two rates. If the lender used a 4% comparison rate for the 24 months left, a simplified IRD would be $200,000 x 1.5 points x 2 years, or $6,000.
The risk you are paying to remove
Waiting only looks as good as blending if rates are still 4% when your term ends. If they are higher, waiting gets expensive fast. The chart shows how much more interest waiting costs, over the same 60 months, at different renewal rates.
The gap runs the other way if rates fall. If you waited and renewed at 3.5%, you would pay $2,352 less interest than blending. In this example the break-even renewal rate is about 3.9%. Below that, waiting wins. Above it, the blend wins.
Hidden costs and conditions to check
- Fees. The FCAC says you usually pay fees when you set up a new mortgage, including a blend-and-extend. When breaking a mortgage, it lists administration, appraisal, reinvestment and discharge fees. Ask which ones apply to a blend.
- A longer commitment. A blend starts a new term, so you are tied to the same lender for longer. If you would rather shop around at renewal, a blend delays that.
- A different formula. If your lender’s method gives a higher rate than the FCAC’s simple version, ask why.
- Cash back. If your mortgage came with cash back, the FCAC warns you may have to repay it if you break the mortgage. Confirm that a blend does not trigger the same clawback.
- Your amortization. A lower payment is not the same as paying less. The FCAC notes that the longer you take to pay off a mortgage, the more interest you pay.
Quick rule for deciding
Get three numbers from your lender, in writing, before you choose.
- The blended rateAnd how it was calculated.
- The full penalty to breakIncluding every fee, not only the penalty.
- Today’s rate for a new termFrom your lender and at least one other lender.
When a blend and extend makes sense
Blending tends to suit you when the penalty to break is large, you want to lock a rate for longer because you think rates may rise, or you want a lower payment now without changing lenders. It suits you less when your term ends soon. Close to maturity you can often renew early without any blend at all.
RBC says its early renewal option lets you renew up to 180 days before maturity without penalty. TD says you can renew without a prepayment charge starting 120 days before maturity. Inside those windows, you get today’s rate on its own, not a blend.
If you are thinking of moving to another lender, compare the blend with breaking and switching. Our guide to switching lenders at renewal shows how to work out the break-even, and our IRD penalty guide explains how lenders size the penalty.
How to ask your lender for a blend and extend
- Read your mortgage contract. Check whether your lender offers early renewal and what it says about prepayment penalties.
- Ask for a written blend quote. Get the blended rate, the new term, the new payment and the method used.
- Ask for a written penalty quote. The FCAC suggests asking your lender to calculate the cost of breaking, including all fees.
- Compare with waiting. Use the calculator above, then test a higher and lower renewal rate, as in the chart.
- Use your prepayment privileges first. The FCAC notes that paying down the balance with your annual privileges lowers the balance future penalties are based on.
If money is tight rather than rates being the issue, the FCAC’s page on mortgage relief options lists other choices, and our look at lump-sum payments shows what paying down principal saves.
Frequently asked questions
What is a blend and extend mortgage?
It is an early renewal. Your lender ends your current term early and starts a new one, such as a 5-year term, at a rate that mixes your old rate with today’s rate. The FCAC says lenders call it a blend-and-extend or blended mortgage, and you do not pay a prepayment penalty, though fees may apply.
How is a blended mortgage rate calculated?
In the FCAC’s simplified method, you weight your current rate by the months left on your term and today’s rate by the remaining months of the new term, then divide by the new term. A 5.5% rate with 24 months left, blended with a 4% five-year rate, gives 4.6%. Your lender must tell you its own method.
Do you pay a penalty to blend and extend?
No prepayment penalty applies, according to the FCAC. You may still pay administrative fees, and the FCAC notes you usually pay fees when you set up a new mortgage, including a blend-and-extend.
Is blending cheaper than breaking my mortgage?
It depends on the penalty. In our hypothetical $200,000 example, breaking and taking 4% for five years cost less in total as long as the penalty stayed under about $5,666. With a penalty above that, blending at 4.6% cost less. Ask your lender for both quotes in writing.
Can I renew my mortgage early without a penalty?
Some lenders allow it close to maturity. RBC says you can renew up to 180 days before maturity without penalty, and TD says it allows renewal without a prepayment charge starting 120 days before maturity. Check your own lender’s window.
Is blend and extend a good idea if rates are rising?
It can be. Blending locks a rate for a new full term, so you are not exposed to whatever rates are when your old term would have ended. In our example, waiting cost $5,820 more in interest if the renewal rate turned out to be 5%. If rates fall instead, waiting wins.
- Sources, checked November 13, 2026: FCAC: Breaking your mortgage contract; FCAC: Mortgage fees, prepayment penalties; FCAC: Mortgage relief options; RBC: Mortgage renewal, why locking in early could be right for you; TD: Mortgage renewal tips.
- Method: The blended rate follows the FCAC’s five-step example. Payments, interest and balances were calculated in Python with monthly payments, interest compounded semi-annually and payments reset on the remaining amortization at each new rate, then rechecked with a closed-form balance formula. The $6,000 IRD is a simplified hypothetical, not a lender quote.
Important: This guide is general information, not financial or legal advice. Blend and extend terms, formulas and fees vary by lender and by contract. All dollar examples are hypothetical. Gizly is not paid by any lender mentioned here. See our affiliate disclosure.
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How this page was made: Gizly uses AI tools to help research and draft its guides. Krish Paul, the editor, is responsible for what Gizly publishes. Spot an error? Tell us and we will fix it.
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