Blend-and-extend vs refinance: which saves more?

Short answer: A blend and extend mortgage lets you lock in a new term with your current lender at a rate that blends your old rate with today's rate, with no prepayment penalty, although administrative fees may apply ^[1]. A refinance means breaking your mortgage and paying a penalty, usually the higher of three months' interest or the interest rate differential (IRD), in exchange for today's full rate ^[2]. Which one saves more depends mostly on how big your penalty is.

If you're paying a rate from a few years ago and today's rates are lower, this guide shows how to compare the two with real numbers. For the bigger picture on refinancing, see our complete mortgage refinance guide or our mortgage refinancing page.

What is a blend-and-extend mortgage?

A blend-and-extend is an early renewal. Instead of waiting for your term to end, you sign a new, longer term now with the same lender. FCAC explains that the lender blends your old interest rate with the new term's rate, that you don't pay a prepayment penalty, and that you may have to pay administrative fees ^[1]. Your lender must tell you how it calculates the new rate ^[1].

How the blended rate is calculated (FCAC's simplified method): multiply your current rate by the months left in your term, multiply today's rate by the remaining months of the new term, add the two, and divide by the months in the new term ^[1]. FCAC's own example blends 5.5% with 24 months left and a 4% five-year rate to get 4.6% ^[1]. Lenders may use their own method, and the rate they blend with may not be the best rate available in the market.

Blend-and-extend vs refinance at a glance

Worked example: which saves more?

Here's a common situation (illustrative):

• Mortgage balance: $400,000, with 21 years left on the amortization
• Current rate: 5.49% fixed, with 24 months left on a 5-year term
• Today's 5-year fixed rate: 4.29% (assumed for both options)
• Simplified IRD: $400,000 × (5.49% − 4.29%) × 2 years = $9,600. Three months' interest would be about $5,490 ^[2]
• Fees (assumed): $250 admin fee to blend; $1,200 legal, appraisal and discharge to refinance

Blended rate: (5.49% × 24 + 4.29% × 36) ÷ 60 = 4.77% for a new 60-month term ^[1].

Here's the cost over the next five years, keeping the 21-year amortization in every case:

Assumptions: illustrative rates and fees; semi-annual compounding; simplified IRD (lenders use their own methods, often based on posted rates ^[2]); penalty and fees paid upfront rather than added to the mortgage. Checked in Python.

What it shows:

• With a large IRD, blend-and-extend comes out about $1,510 ahead of refinancing.
• With a three-months' interest penalty, refinancing comes out about $2,600 ahead.
• The break-even penalty here is about $8,100. Below that, refinancing saves more; above it, blending does.
• Blending cuts your payment by about $160 a month right away, but over five years it saves only about $370 compared with staying put, because years three to five carry part of your old rate.

After five years, the refinance option also leaves you with a balance about $2,900 lower than the blend, because more of each payment goes to principal at the lower rate. If the penalty is borderline, that can tip the decision.

Got a blend-and-extend offer from your lender? A licensed 8Twelve agent can compare it with refinancing across 65+ lenders, using your real penalty quote, OAC. Compare your options

When blend-and-extend usually saves more

• Your penalty is an IRD and it's large. FCAC says lenders usually use the IRD when your rate is higher than today's rate and you signed less than five years ago, and the months left are part of the calculation ^[2].
• You want a lower payment now with no upfront penalty.
• You'd struggle to qualify elsewhere. FCAC notes that if you break your mortgage, you may no longer qualify under current conditions ^[1].
• You need a small amount of extra money and your lender allows a blend-and-increase. In our experience, the lender blends your existing rate on the current balance with today's rate on the new money; ask how yours does it.

When refinancing usually saves more

• Your penalty is three months' interest. In our experience, many variable-rate contracts calculate it this way; check yours.
• The rate gap is wide and there's plenty of term left to recover the penalty.
• You want to change lenders, products or terms, or need more money than your lender will blend in.
• You can get a better rate than the one your lender would blend with. Shopping the market is easier through a broker with 65+ lenders.

And if today's rates are higher than your contract rate, a blend raises your rate. For example, 3.99% with 24 months left blended with 4.29% gives about 4.17%. That can still make sense if you want certainty for longer or need extra money, but it won't lower your cost.

Will you need to pass the stress test?

A refinance is a new approval, so federally regulated lenders qualify you at the higher of 5.25% or your contract rate plus 2% ^[3][5]. OSFI doesn't expect lenders to apply that test to an uninsured straight switch at renewal with no increase to the amount or amortization ^[5], but breaking mid-term to refinance isn't a straight switch. For a blend-and-extend with no new money, in our experience lenders often treat it like an early renewal. If you add money, expect to qualify again. If your income or debts have changed since you signed, that can matter as much as the rate. Our guide to GDS and TDS ratios explains how lenders test that. If you need cash but want to keep your current rate, compare a HELOC vs a refinance.

What to ask your lender before you decide

1. The blended rate in writing, and how it was calculated ^[1].
2. A written penalty quote for the date you'd refinance, and the method used ^[2].
3. Every fee for each option: admin, appraisal, legal, discharge and any cash-back repayment ^[1].
4. Whether you'd need to requalify if you blend and add money.
5. The new term length and whether prepayment privileges change.

Then compare total cost over the same period, not just the new payment. FCAC says you'll usually pay fees when you set up a new mortgage, including a blend-and-extend, and lenders may cover some of them ^[1].

Step by step: comparing with a broker

1. Gather your balance, rate, maturity date and amortization.
2. Get the blended-rate offer and a penalty quote from your lender.
3. Have a broker price a refinance across lenders, including the stress test ^[3].
4. Line up both options over the same 60 months, including all fees.
5. Choose the lower total cost that fits your monthly budget.

Other options to consider

• Wait for renewal. If you're close to your maturity date, there's no penalty at the end of the term ^[2], and our mortgage renewal guide covers how to shop it.
• Use your prepayment privileges before you break, so any penalty is based on a lower balance ^[2].
• Port your mortgage if you're moving, to avoid breaking the contract ^[2].
• Think twice about extending your amortization to lower payments; FCAC warns it can add thousands in interest ^[4].
• A second mortgage can avoid breaking your first, but it usually costs more ^[6]. 8Twelve arranges these through third-party lenders; we don't lend or fund private mortgages.

Weighing fixed against variable for the new term? See our fixed vs variable mortgage guide.

From our desk: We often see a blend-and-extend offer that looks great on the monthly payment but saves little over the term. Putting it next to a real penalty quote and a market rate usually makes the choice clear in a few minutes.

A blend-and-extend saves more when your penalty is large; refinancing saves more when your penalty is small or you can get a better rate elsewhere. Get both numbers in writing and compare total cost over the same term before you sign.

Run the numbers: compare payments with our mortgage renewal calculator, or see the full list of fees in our refinance costs guide.

This article is for general information only and isn't financial, legal or tax advice. Rates, products and terms change without notice and are available on approved credit (OAC). The rate and terms you qualify for depend on your individual financial situation, including credit, income, property and loan-to-value. "Best rates" means the most suitable options available for your situation, not a guarantee of the lowest rate. Example rates and payments are for illustration only, as of October 2026, and are not an offer. 8Twelve Mortgage arranges mortgages through 65+ lenders and does not lend directly. Licensed across Canada — see our licences.

Example rates are for illustration only, as of October 25, 2026, and are not an offer. Your actual rate depends on your situation, OAC. The blend-and-extend and refinance examples use an assumed balance, rates and fees, with semi-annual compounding and a simplified IRD; your lender's blended rate and penalty calculations will differ. 8Twelve does not fund second or private mortgages; we arrange them with third-party lenders, and lender and brokerage fees are disclosed in writing before you commit. Rules checked against FCAC and OSFI on October 26, 2026.