Mortgage refinance in Canada: how much you can take out, what it costs, and when it is worth it

A mortgage refinance replaces your existing mortgage with a new, larger or restructured one. It is not a renewal. A renewal keeps the loan amount frozen and asks only for a new rate; a refinance changes the loan itself — which means a new appraisal, full qualification at the stress-test rate, and in most cases a prepayment penalty if you do it mid-term.

The federal ceiling is 80% of your home's appraised value. If your home appraises at $900,000, the largest new mortgage available on a conventional refinance is $720,000, regardless of what you paid, what you owe, or how good your credit is. Everything else — the rate, the amortization, whether you pass — is negotiable. That number is not.

The rest of this page is the arithmetic: how much you can actually access after costs, what the stress test really requires in 2026 (contract rate plus 2%, which today means about 6.29% — not 5.25%), how a prepayment penalty is calculated and why two lenders quote wildly different numbers on the same mortgage, and when blending beats breaking.

When a mortgage refinance is the right tool — and when it isn't

Refinancing is a good answer to a specific set of problems and a poor answer to several others. These are the situations where it usually earns its cost.

What does it mean to refinance a mortgage in Canada?

To refinance is to discharge your existing mortgage and register a new one, usually for a larger amount. The new mortgage pays out the old one and any other debt you fold in, and the difference comes to you as cash or goes directly to your creditors. Legally it is a new loan: a new charge is registered on title, a lawyer or title company handles the payout, and you qualify from scratch.

That last point is what separates refinancing from every other mortgage transaction. At renewal your existing lender does not requalify you, and since November 2024 an uninsured straight switch to a new lender is exempt from the stress test too. A refinance has no such exemption. Your income, your debts, your credit and your property all get looked at again.

The practical consequence is timing. A renewal can be arranged in days. A refinance takes two to four weeks from application to funding in a normal file — appraisal, income verification, lender approval, lawyer's instructions, statutory waiting periods. If a deadline is driving your refinance, start counting backwards from it now.

Refinance vs. renewal vs. HELOC vs. second mortgage

How much can I refinance my home for? The 80% LTV rule

You can refinance to a maximum of 80% of your home's appraised value, minus anything already secured against the property. The formula is short: appraised value × 0.80, minus your current mortgage balance, minus any HELOC or second mortgage balance, minus closing costs. What is left is what reaches your bank account.

The appraised value is the lender's number, not yours and not your neighbour's sale price. Lenders will often start with an automated valuation model to see whether the file is close, then order a physical appraisal at $300 to $500 to confirm it. A value that comes in $40,000 below expectation costs you $32,000 of available proceeds, which is why it is worth being honest with yourself about condition and comparables before you plan around a number.

Insured refinances are, as a general rule, not available. Default insurance is for purchases and for transfers, not for pulling equity out — with one narrow and genuinely useful exception covered further down this page.

What 80% LTV actually releases, on a $900,000 home

Do you have to pass the stress test to refinance?

Yes. Every uninsured refinance at a federally regulated lender must qualify at the minimum qualifying rate: the greater of your contract rate plus 2% or 5.25%. There is no exemption for refinances, and there never has been. OSFI's November 2024 relief applies only to straight switches at renewal where nothing increases.

The number people get wrong is which half of that formula bites. At today's rates, contract plus 2% wins by a wide margin. A refinance at 4.29% qualifies at 6.29%. A B-lender refinance at 5.89% qualifies at 7.89%. The 5.25% floor has been irrelevant since 2022 and quoting it will give you a badly wrong sense of how much you can borrow.

The practical impact is large. On a 25-year amortization, an $810,000 refinance carries a real payment of $4,389 a month at 4.29% — but you must qualify as though it were $5,323. That $934 gap is the difference between deals that fund and deals that fall apart at underwriting, and it is why we run the qualifying math before pulling credit rather than after.

• GDS and TDS ratios still apply — commonly 39% and 44% at A lenders
• Every debt counts: card balances at 3% of the limit, lines of credit, car loans, support payments
• Rolling debt into the refinance removes those payments from the TDS calculation, which is often what makes the file work
• B-lenders and credit unions apply their own ratios and can be materially more flexible

Minimum qualifying rate at 2026 pricing

What is the penalty for breaking a mortgage to refinance?

On a closed variable-rate mortgage the penalty is three months' interest, full stop. On a closed fixed-rate mortgage it is the greater of three months' interest or the interest rate differential (IRD) — and the IRD is where the surprises live. Two lenders holding identical mortgages will quote penalties that differ by five figures, because they use different comparison rates.

The common IRD formula is: (your contract rate − a comparison rate) × your balance × the number of months remaining ÷ 12. The comparison rate is the argument. Monoline lenders generally use their current posted rate for a term closest to your remaining term, which is a discounted, market-level rate. Most big banks use their current posted rate for that term minus the discount you originally received off posted — a formula that can help or hurt depending on how large that original discount was.

Here is the same mortgage run three ways: a $448,000 balance at 5.64% with 34 months remaining on a five-year fixed. The comparison rates below are illustrative — posted rates differ by lender and change weekly, so the only number that counts is the written payout statement from your lender.

Illustrative penalty on $448,000 at 5.64%, 34 months remaining

Blend and extend, or break and refinance?

A blend-and-extend keeps your existing mortgage alive and averages your current rate with today's rate over a new, longer term. No penalty is charged, because nothing is broken. The trade is that you do not get today's rate — you get a weighted average of today's rate and the rate you were already stuck with.

The arithmetic is straightforward. If you have 34 months left at 5.64% and you extend to a fresh 60-month term at 4.29%, the blend is (5.64% × 34 + 4.29% × 26) ÷ 60 = 5.06%. Add new money at today's rate and it weights down further: $60,000 of new borrowing at 4.29% on top of a $448,000 blended balance produces a blended rate of about 4.96% on $508,000.

Whether that beats breaking depends entirely on the penalty. Compare total cost over the same window — payments made plus balance still owing at the end — rather than comparing rates. On the numbers above, blending costs $624,286 over five years and breaking (at 4.29%, with the $21,579 penalty added to the balance) costs $634,000. Blending wins by $9,714. Change the penalty to $8,885 and breaking wins instead. There is no rule of thumb here; there is only the calculation.

• Blend-and-extend is offered by your existing lender only — it is not shoppable, so you cannot competitively price it
• Not every lender offers it, and some only blend to term rather than extending
• You can usually add new money in a blend, which is how renovations get funded without a penalty
• Breaking gives you today's rate and a fresh choice of lender, at the cost of the penalty and closing costs
• If your maturity is within 12 months, doing nothing until then is frequently the cheapest option of all

What does a mortgage refinance cost, and how long does it take?

Budget $1,800 to $3,000 in closing costs on a straightforward refinance, plus the prepayment penalty if you are breaking a term. Most of it can be deducted from the advance rather than paid out of pocket, which is how the majority of refinances are structured.

The timeline is two to four weeks in a clean file. The parts that stretch are the appraisal (scheduling and turnaround, typically three to seven business days), income verification if you are self-employed, and the lawyer's schedule at month-end. Provincial rules add a small amount: in some provinces a refinance advance is held for a short period after registration.

One cost people forget: refinancing resets your term, so a mortgage you were 40 months into becomes a mortgage you are zero months into. If you are likely to sell within two years, a five-year fixed refinance can create a penalty problem down the road that did not exist before. That is an argument for a shorter term or a variable rate, not against refinancing.

Typical refinance closing costs in Canada

The one insured exception: refinancing to build a secondary suite

Since 2024 there has been a route past the 80% ceiling, and almost nobody writes about it. CMHC's secondary suite refinance program allows an insured refinance to up to 90% loan-to-value for the specific purpose of building self-contained additional units — a basement apartment, a garden suite, a laneway house, a converted duplex.

The conditions are strict and worth reading twice. The property value must be under $2,000,000 after improvements. The property can have a maximum of four units in total. At least one unit must be occupied by the borrower or a related person living there rent-free. Each new unit must be fully self-contained. Short-term rentals are not permitted. Amortization can run to 30 years, with a 0.20% premium surcharge over the 25-year option, and the minimum credit score is 600.

The hard constraint is the one people trip on: equity takeout is not permitted. Every dollar above your existing balance must fund the construction, evidenced by quotes and released against progress. You cannot use this program to consolidate debt, buy a car, or top up savings. If your goal is a rental unit and your municipality permits one, it is the cheapest capital available to a Canadian homeowner outside a purchase.

Refinancing with bruised credit, self-employed income, or a rental property — and the tax question

If you fail the stress test at an A lender, you have not run out of options — you have changed price tiers. B-lenders and credit unions will refinance to 80% using broader income documentation and lower credit thresholds, typically at 1.0% to 2.0% above A rates plus a lender fee of around 1%. Beyond that sit private lenders, generally 7% to 11% interest-only on a first mortgage with a 1% to 3% fee, to about 75–80% LTV. Each tier is a bridge with a plan attached, not a place to live.

Rental and investment properties are refinanceable to 80% for one-to-four unit residential, though most lenders price them 15 to 30 basis points above owner-occupied and will use only a portion of the rental income in qualifying. Self-employed borrowers should assume the last two years of T1 Generals and Notices of Assessment will be requested, plus corporate financials if incorporated — and should know that alternative lenders will look at bank-statement income instead.

On tax: in Canada, the deductibility of mortgage interest depends on what the borrowed money is used for, not on what secures it. Interest on funds borrowed to earn income from a business or investment is generally deductible; interest on funds borrowed for personal use is not. That distinction can be worth thousands a year on a refinance used to invest, and it demands proper tracing of the funds. We are mortgage brokers, not accountants — bring your accountant in before you structure it, not after.

• A lenders: best rates, strictest documentation, MQR at contract rate + 2%
• B lenders and credit unions: roughly 1.0–2.0% above A rates plus ~1% lender fee, broader income rules
• Private lenders: ~7–11% interest-only on a first, 1–3% fee, to about 75–80% LTV, no stress test
• Every alternative-tier refinance should be arranged with a documented exit back to A pricing

How Lendmax structures a refinance

Most refinances fail for one of three reasons: the appraisal came in low, the penalty was bigger than assumed, or the file could not carry the qualifying payment at contract rate plus 2%. All three are knowable before you apply, and we check all three first.

We use an automated valuation model to bracket your property's likely appraised value and your loan-to-value band, an AI-assisted read of your credit file to identify which lender tier will actually approve you, and a comparison of live offers across 30+ lenders — A lenders, monolines, credit unions, alternative and private. Documents are signed digitally and the lawyer is instructed as soon as the commitment is issued.

1. Establish the ceiling before anything else — AVM valuation, current balances on every charge registered against the property, and the 80% calculation. If the number that comes out is smaller than what you need, we say so on the first call rather than after an appraisal fee.
2. Get the penalty in writing — We request your lender's payout statement immediately on any mid-term refinance and compare break-and-refinance against blend-and-extend on total cost over the same window — payments plus remaining balance, not just rate against rate.
3. Qualify at the MQR first, quote second — We run your GDS and TDS at contract rate plus 2% before presenting options, including the debts you plan to pay off, so the approval that comes back matches the plan you agreed to.
4. Match the tier to the file, with an exit — If A pricing works, that is where it goes. If it does not, we price the B or private alternative honestly — fee included in the effective cost — and diarize the file for the refinance back to A pricing when the numbers support it.

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