Vaughan, Ontario · FSRA #13737

Blend-and-extend
mortgage calculator —
see your blended rate.

Q: What is blend and extend?

It's a way to change your rate without breaking your mortgage. Your lender averages (blends) your current contract rate over the time left in your term with today's rate over a new, extended term, and you sign a fresh longer term at that blended rate — no prepayment penalty. It's most attractive when rates have risen and you want certainty, or fallen and you want some of the benefit without an IRD.

Enter your current rate, the time remaining, and your lender's extension offer. See your exact blended rate and compare it against breaking — including the IRD penalty.

Blend vs break explained

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Blend-and-extend mortgage calculator.

Fact-checked by Surrayya Afzal, Principal Broker, FSRA #M14001433·Last reviewed October 2026

The short answer

A blend-and-extend mixes your current rate with today's rate and starts a new term. When today's rates are much lower than yours, breaking and refinancing can still win, even after the penalty.

Your numbers

Mortgage balance

$450k

Your current rate

2.79%

Months left in term

20 mo

Rate your lender offers for the extension

4.59%

New term

5 yr

Amortization remaining

22 yr

Blended rate over a 5-year term

3.99%

No separate penalty to pay (lenders may build some of it into the blended rate)

Payment comparison

Payment at blended rate$2,555

Payment if you stayed (current rate)$2,279

Payment at today's rate (clean switch)$2,700

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Read the full explanationThe rules behind the numbers, with worked examples.

Blend, break, or stay?

Blend-and-extend exists to solve one problem: you want to change your rate or lock a longer term before your current term ends, but you don’t want to pay a prepayment penalty to do it. The lender blends your existing rate with today’s rate and you sign a new, longer term at that average — and because you never technically break the mortgage, there’s no Interest Rate Differential to pay.

How the blended rate is built

It’s a time-weighted average. The months remaining on your current term keep your old rate; the additional months take the extension rate your lender offers; the blend is the weighted average across the whole new term. So the more time left on your current (cheaper) rate, the lower the blend — and the longer the extension you add at today’s rate, the more the blend drifts toward current pricing. The calculator shows the exact blended rate for your inputs.

A worked example: $450,000 with 20 months left

Say you’re at 2.79% with 20 months left on a $450,000 balance, and you blend into a new 5-year (60-month) term at an assumed new rate of 4.59% (illustrative rates, not a quote). Twenty months keep the 2.79%; the other 40 months take 4.59%. The blended rate is (2.79 × 20 + 4.59 × 40) ÷ 60 ≈ 3.99% — below the 4.59% new rate, with no separate penalty payable to get there. In this example blending is cheaper than breaking because the extension rate is higher than the old rate. Breaking tends to win only when market rates fall well below your contract rate or the lender pads the blend. Compare the written offers and fees.

The honest caveat

Lenders set the blended rate, and they don’t always set it generously. A padded blend can quietly cost more than breaking the mortgage and switching to a sharply discounted new rate, even after the penalty. So the right move is always to compare all three paths on real numbers: the blended rate here, the cost to break in the penalty calculator, and the savings from a clean switch in the refinance calculator. We run that comparison across 100+ lenders and recommend the genuinely cheaper path — not the one your lender prefers.

How to use this calculator

Enter your current mortgageAdd your balance, current interest rate, and the number of months left in your term. The calculator uses these to anchor the blended rate calculation.
Add the extension rate and new termEnter the rate your lender is quoting for the extension and the new term length. The blend is a time-weighted average — so both numbers matter equally.
Compare and call usReview your blended rate and monthly payment, then compare it against breaking and switching. We'll benchmark the written blend offer against 100+ lenders and tell you which path saves you more — including all fees.

How this is calculated

The extension-rate default is illustrative as of October 2026; enter the lender's quote, which can be higher than the best market rate. Blending into a higher rate mainly makes sense when you need funds or want to lock in ahead of further increases. Additional borrowing is not modelled here; use the refinance calculator. Blended rate is a time-weighted estimate; your lender's actual blend may differ. Compare the blend against breaking and switching (penalty + new rate) before deciding.

FAQ

Common questions

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What is blend and extend?

It's a way to change your rate without breaking your mortgage. Your lender averages (blends) your current contract rate over the time left in your term with today's rate over a new, extended term, and you sign a fresh longer term at that blended rate — no prepayment penalty. It's most attractive when rates have risen and you want certainty, or fallen and you want some of the benefit without an IRD.

How is the blended rate calculated?

It's a time-weighted average. The months remaining on your current term keep your old rate; the additional months of the extension take today's rate; the blend is the weighted average across the whole new term. The calculator shows the exact blended rate for your inputs — your lender's offer may differ slightly because banks don't always blend in your favour.

Is blend-and-extend better than breaking my mortgage?

Sometimes. Blending avoids the prepayment penalty entirely, which on a Big-6 posted-rate IRD can be five figures. But lenders often pad the blended rate, so a clean break-and-switch to a sharp new rate can still win even after the penalty. The only way to know is to compare both — run your penalty in the penalty calculator and the switch in the refinance calculator.

Can I blend with any lender?

Most A-lenders offer a blend, but the terms vary — some blend-to-term (keeping your maturity date), others blend-and-extend (resetting it). Some lenders don't offer blends at all, and some fold part of the penalty into the blended rate. Because the lender controls the blended rate, it's worth having a broker benchmark the blend against the open market before you accept.

Does blend-and-extend cost anything upfront?

No prepayment penalty is charged — that's the main appeal. However, some lenders reduce the benefit by offering a blended rate that is higher than a fair time-weighted average, effectively recovering some of the penalty through the rate itself. Always get the blend offer in writing and compare it against what a clean break would cost.

When should I blend instead of waiting for maturity?

Blend-and-extend makes sense when you want rate certainty for a longer term, you expect rates to rise further before your maturity date, or you need access to equity mid-term without a HELOC. Waiting works when your term ends soon and today's rates are at or above your contract rate. We'll model both paths and tell you which one wins.

Words to know

Blended rate IRD Mortgage term

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See today’s rates behind these numbers: the Canadian Lending Snapshot