Porting a Mortgage: When It Works and When It Quietly Doesn't
Porting sounds like a simple way to carry your mortgage from one home to the next without penalty. Sometimes it is. It also comes with conditions that catch people off guard right in the middle of a move.
The short version
- Porting means carrying your existing mortgage — the same contract pricing and remaining term — from your current home to a new one, avoiding the penalty you'd otherwise pay to break the term early.
- It only works with the same lender. There's no such thing as porting to a different institution.
- Most lenders give you a window of 30 to 120 days between selling and buying to complete the port — miss it, and the option is gone.
- Not every mortgage can port. Most variable mortgages and some restricted fixed products can't, which is worth checking before you count on it.
- If your new home costs more, the extra money is a separate piece financed on today's terms and blended with your ported balance — not a simple top-up on your old contract.
What porting actually means
Porting a mortgage means taking your existing mortgage — its contract pricing, its remaining term, its conditions — and transferring it to a different property when you move, instead of breaking your current contract and starting a new one.
The appeal is straightforward. Breaking a fixed-term mortgage early usually triggers a penalty, and if your existing contract pricing is lower than what's currently on offer, restarting from scratch also means giving that up. Porting is built to avoid both: no penalty, and your existing terms carry forward onto the new property.
When it actually works
Porting makes the most sense when your existing contract pricing is lower than what you'd qualify for today. In that situation, carrying your old terms forward — rather than restarting on current pricing — is worth real money over what's left of your term.
It also depends on timing. Most lenders give you a window, commonly somewhere between 30 and 120 days, to complete the sale of your current home and the purchase of your next one. Some lenders are stricter than others about this, and 120 days is usually enough time to manage a typical move — but a sale that drags or a purchase that closes early can put the window at risk.
And it depends on the mortgage itself being portable in the first place. Every lender's product is different: some fixed terms are explicitly non-portable, sometimes called restricted mortgages, which can carry a lower headline offer specifically because they give up features like porting. Most variable mortgages generally can't port at all. None of this is visible from your payment statement — it's in the original contract, which is worth checking before you assume the option exists.
Where it quietly doesn't work
The most common surprise is the lender restriction: porting only works within the same institution. If you're unhappy with your current lender and were hoping to move both your mortgage and your address at once, porting doesn't get you there — that's a switch, evaluated as its own decision, not a port.
The other quiet failure mode is timing. If your purchase closes before your sale, or your sale closes and your next purchase takes longer than the port window allows, you can end up outside the conditions that made porting available in the first place — sometimes needing a bridge solution to cover the gap instead. And if your existing contract pricing is actually higher than what's currently available, porting stops being the better option regardless of whether it's available to you; a fresh application, even with a penalty, can come out ahead.
What to check before you count on it
Before you list your current home with a port in mind, confirm three things with your lender or your broker: whether your specific mortgage is portable at all, how many days your particular lender allows between closings, and what a blended structure would actually look like if your next purchase costs more than your current balance. All three are answered in minutes with the right paperwork in hand, and all three change the plan if the answer isn't what you assumed.
If you're planning a move where the timing between selling and buying is uncertain, our Next Home Hub covers the broader picture — porting, timing a purchase against a sale, and bridge financing for the gap when the two don't line up cleanly. And if a genuine gap between closings looks likely, bridge financing is the tool built specifically for that, separate from a port.
Nearly thirty years in Canadian financial services, based in Waterloo Region and working across Ontario. Most people are handed a product — you deserve a plan.
Porting conditions — the window between closings, portability of a specific product, and how a blended balance is calculated — vary by lender and by mortgage. This article describes common industry practice, not a specific lender's terms. Confirm the details of your own mortgage before relying on porting for a move. Everything here is illustrative and subject to lender approval and final terms.
Sources: Ratehub.ca — guide to porting and transferring a mortgage in Canada