Porting a mortgage in Canada means moving your existing mortgage, its rate, its term and its remaining balance, to a new property instead of breaking it and arranging a fresh loan. The main reason to do it is avoiding the prepayment penalty that breaking a mortgage usually triggers, which matters most when your current rate sits below what the market offers today. Porting isn’t a simple handover, though. It only works with the lender you already have, the math changes depending on whether your new home costs more or less than the one you’re selling, and your sale and purchase have to close inside a window your lender sets, not whenever suits you, one of several financing decisions covered in our complete Toronto real estate guide.
What porting a mortgage actually means
When you port a mortgage, the lender lets you carry your existing loan, the outstanding balance, the interest rate and however much term is left, over to a different property instead of discharging the old mortgage and underwriting a brand new one. The balance doesn’t change on its own. What moves is the loan itself, attached to a new address. The reason this matters is the prepayment penalty most closed mortgages charge when you pay them off before the term ends. Selling your home normally counts as paying off that mortgage early, so without porting, a seller mid-term on a good rate would owe that penalty on top of everything else closing involves. Porting avoids it, provided the lender agrees to carry the loan forward rather than treating the sale as an early payout.
Porting is distinct from two other mechanics people often confuse it with. Assuming a mortgage means a different buyer takes over someone else’s existing loan. Porting means the same borrower moves their own mortgage to a new property. A vendor take-back mortgage is a brand new loan with the seller acting as lender, not a transfer of any existing mortgage at all. Our guide to assumable mortgages in Canada covers how assumption and a vendor take-back actually work and how both differ from porting, so this guide focuses entirely on the porting mechanic itself.
Why switching lenders means breaking the mortgage instead
Porting only works with the lender who already holds your mortgage. If you want to move to a different lender at the same time you move homes, maybe because a competitor is offering a better rate, you aren’t porting anything. You’re breaking your current mortgage first, penalty included, and then arranging an entirely new one with the new lender. The two transactions can happen close together, but they’re legally and financially separate, and the penalty for breaking the old mortgage doesn’t disappear just because a new one follows immediately.
A straight switch at renewal is a different situation entirely. Since November 2024, a borrower who switches lenders at the end of their term, without porting to a new property and without increasing what they owe, no longer has to pass the mortgage stress test again on that straight switch, per the Office of the Superintendent of Financial Institutions’ own exemption covered in our guide to mortgage renewal in Toronto. That exemption applies to staying in the same home and changing lenders at renewal. It has nothing to do with porting to a new address, which is decided entirely by your current lender, not by how competitive another lender’s offer looks.
Not every mortgage is portable in the first place. Whether porting is available at all depends on the lender and the specific product, and some lenders exclude certain variable-rate or discounted products from porting altogether. Confirm directly with your lender before counting on the option. It isn’t a feature every mortgage in Canada carries.
When the new home costs more: blend-and-extend
If the home you’re buying costs more than your old mortgage balance, porting alone doesn’t cover the gap. Lenders handle this through what’s called a blend-and-extend: the amount you already owe keeps its existing rate, the additional amount you’re borrowing gets priced at the lender’s current rate, and the two are blended into a single rate for the new mortgage, weighted by how much of the total balance each portion represents. The term usually resets as part of this process too, commonly to a new five-year term, though that depends on the lender and what you agree to.
The blended rate sits somewhere between your old rate and today’s rate, closer to whichever portion makes up more of the total loan. A borrower porting a mostly-paid-down mortgage onto a much larger loan ends up with a blended rate close to current market rates, since the new money dominates the balance. A borrower who still owes most of their original balance and is only topping up a little keeps a rate much closer to their original one. The exact number depends on your own balance, the new amount, and the lender’s rate at the time, which is why no single blended rate applies across every port. Ask your lender to run the actual blend before you commit to anything, rather than estimating it yourself.
When the new home costs less: the paydown that can still cost you
The reverse situation gets less attention, but it carries its own catch. If the home you’re buying costs less than your existing mortgage balance, the lender generally requires you to pay down the excess before porting the rest forward. That paydown is a partial repayment of a loan that hasn’t reached the end of its term, and partial prepayments on a closed mortgage can themselves trigger a prepayment charge, even though the core port, carrying the remaining balance and rate forward, avoids the full penalty that breaking the mortgage outright would cause.
Most closed mortgages include an annual prepayment privilege that lets you pay down some amount without a charge, so a modest downsize might fall entirely inside that allowance and cost nothing extra. A bigger gap between what you owed and what your new home costs can exceed it, and the lender calculates the charge on the excess the same way it would for any other prepayment above that allowance. Ask your lender to work out this specific number before assuming a downsize ports for free. It often doesn’t.
The timing-gap problem
Porting also depends on timing in a way breaking and re-arranging a mortgage doesn’t. The lender generally wants the sale of your current home and the purchase of your new one to close within a set window, and that window is often tighter than people expect. One Canadian mortgage brokerage puts a typical porting window at 30 to 120 days between the two closings, and recommends starting the process six to eight weeks before your closing date so there’s time to get the port approved (Pegasus Lending, checked October 2026). The exact window varies by lender, so confirm it directly rather than assuming any single figure applies to your file.
When your sale and purchase don’t line up inside that window, whether your buyer’s closing slips or your own purchase closes first, bridge financing is the usual fix, a short-term loan that covers the gap between the two closing dates rather than anything connected to the port itself. Our guide to sequencing a sale and a purchase in Ontario covers how bridge financing actually works and what it costs. Lining up your closings well in advance avoids needing it at all, but when the dates can’t match, a port and a bridge loan can work together rather than forcing a choice between one or the other.
When porting actually beats breaking the mortgage
Porting makes the most sense in a narrow set of circumstances: your existing rate sits meaningfully below what’s currently available, and the new loan amount you need is reasonably close to what you already owed. With the Bank of Canada’s overnight rate held at 2.25% as of its September 2026 announcement, a borrower who locked in a materially lower rate years ago has a meaningful gap to protect, and porting lets them keep most of that advantage on the portion of the loan that doesn’t change. If your new home costs a lot more, the blend-and-extend math pulls your blended rate closer to today’s rate anyway, narrowing the benefit the more you’re borrowing beyond your original balance.
Where your existing rate isn’t meaningfully different from today’s, or you’re borrowing substantially more than before, the convenience of porting has to be weighed against what breaking the mortgage and shopping a new lender might get you instead, including a better rate or product elsewhere. There’s no flat rule that favours one over the other outside of those specific numbers, which is exactly why running both scenarios with your lender, rather than assuming porting automatically wins, is the useful step before deciding.
Frequently asked questions
What does it mean to port a mortgage in Canada?
Porting a mortgage means carrying your existing mortgage, its outstanding balance, interest rate and remaining term, over to a new property with the same lender, instead of discharging it and arranging a completely new mortgage. The appeal is avoiding the prepayment penalty that breaking a closed mortgage before the end of its term usually triggers, which matters most when your current rate is below what’s available today. Porting isn’t automatic. It depends on your specific mortgage contract allowing it, your existing lender agreeing to carry the loan forward, and your sale and purchase closing within a window the lender sets.
Can I port my mortgage to a different lender?
No. Porting only works with the lender who already holds your mortgage. Moving to a different lender at the same time you move homes isn’t porting. It’s breaking your current mortgage, penalty included, and then arranging a separate new mortgage with the new lender, even if both happen close together. This is different from a straight switch at renewal, where since November 2024 a borrower changing lenders without increasing their loan or moving to a new property no longer has to pass the stress test again. That exemption applies to staying put and switching lenders, not to porting to a new address.
What happens if my new home costs less than the one I’m selling?
You generally have to pay down the extra balance before the rest of the mortgage ports forward. That paydown counts as a partial prepayment on a loan that hasn’t reached the end of its term, and it can trigger its own prepayment charge if it exceeds whatever prepayment privilege your mortgage already allows each year without a penalty. A modest downsize might fall entirely inside that allowance and cost nothing extra. A larger gap between your old balance and your new home’s price is more likely to exceed it. Ask your lender to calculate the actual charge before assuming a downsize ports penalty-free.
How much time do I have between selling and buying to port my mortgage?
It depends on the lender, but the window is usually tighter than people expect. One Canadian mortgage brokerage puts a typical porting window at 30 to 120 days between your sale closing and your purchase closing, and recommends starting the process six to eight weeks ahead of your closing date to leave room for approval. Confirm the exact window with your own lender rather than assuming a figure that applies elsewhere applies to your file too. When your two closing dates can’t line up inside that window, bridge financing is the usual way to cover the gap instead.
Is porting always better than breaking my mortgage?
No. Porting tends to make the most sense when your existing rate sits meaningfully below current rates and the new amount you need to borrow is close to what you already owed. If you’re borrowing a lot more, the blend-and-extend math pulls your blended rate toward today’s rate anyway, which narrows the advantage. If your existing rate isn’t meaningfully different from what’s available now, breaking the mortgage and shopping a new lender might get you a better rate or product than carrying the old one forward would. Run both scenarios with your lender using your actual numbers before deciding either way.
Whether porting makes sense for a specific move comes down to your mortgage’s own rate, how much more or less your new home costs, and whether your two closing dates can realistically line up, and those numbers are worth running with your lender before you make an offer. Get in touch with our team to talk through the financing side of a move, or browse current Toronto listings while you weigh the options. See our guides to assumable mortgages in Canada and mortgage renewal in Toronto for the related financing routes, or browse the rest of our guides.