Porting a Mortgage in BC: Why It Usually Disappoints

The Short Answer

Porting means taking your existing mortgage with you when you move, keeping the rate and term rather than breaking the mortgage and paying a penalty. It’s real, it’s a genuine feature, and it works properly in a narrower set of circumstances than almost anyone expects.

The reason is arithmetic rather than fine print. Most people who move are moving up, which means they need more money than they currently owe. The portion you port keeps your old rate. The new money is priced separately by a lender who knows you have already committed to the move — and it is rarely their sharpest pricing. Blend the two and the advantage you were protecting has frequently disappeared.

Add a requalification you didn’t expect, a porting window that doesn’t match how BC transactions actually close, and a new property the lender has to find acceptable, and the picture is less a feature than a possibility worth checking against the alternative.

Why It Gets Marketed So Hard

Portability is one of the few mortgage features that sounds unambiguously good in a branch conversation. It says: this contract is flexible, we’re not trapping you, life can change.

Notice who sets the terms of that flexibility. The lender who prices the port also prices the penalty you’d pay to leave instead. One institution decides both the cost of staying and the cost of going. That isn’t bad faith — it’s structure — but it means the flexibility is worth precisely what they decide it’s worth, and the number they’d have to beat is a number they also control.

The same logic runs underneath most of the flexibility features that get marketed hardest, and it’s worth carrying into any conversation where a lender is explaining why you should stay.

The Blend Is Where It Falls Apart

This is the part that decides most files, and it’s the part least often explained before someone commits to a move.

If you’re moving up, you need a larger mortgage. Say you owe a certain amount at an attractive rate from a few years ago, and the new purchase needs meaningfully more. You don’t get the old rate on the whole thing. You get the old rate on the ported portion, and a new rate on the new money, blended into a single rate across the total.

Two things then work against you.

The new money is priced without competition. You’ve told the lender you’re moving, you’ve told them you want to port, and you’ve usually told them under time pressure. A borrower in that position is not shopping. Pricing on the new portion reflects that, and it is generally not what the same lender would quote a stranger walking in the door.

The blend dilutes exactly what you were protecting. The larger the new money relative to the ported balance, the more the blended rate drifts toward the new-money rate. On a substantial move up, the old rate can end up contributing very little to the final number — while the whole decision was made to preserve it.

The honest test is simple and almost nobody runs it: compare the blended rate on the ported deal against the market rate available on a fresh mortgage elsewhere, after subtracting the penalty from the benefit. Not the old rate against the market rate. The blended rate. Those are different comparisons and only one of them is the actual decision.

Three Other Things That Catch People

You have to requalify

Porting is not automatic and it is not a transfer of an existing approval. It’s a new application against the new property, fully underwritten, with current income, current debts and the current qualifying rules. Households whose circumstances have changed — a business income that now reads differently, a new vehicle payment, a spouse who has left employment — sometimes discover at the worst possible moment that the port they were counting on isn’t available.

Where that risk exists at all, it should be tested before subjects are removed on a purchase, not after.

The porting window rarely matches how BC deals actually close

Lenders allow a limited number of days between your sale completing and your purchase completing for a port to remain valid. The windows vary and some are considerably shorter than people assume.

Real transactions don’t cooperate with that. Sales and purchases in BC frequently complete weeks apart in either direction, and the gap is often not something you chose. If your dates fall outside the lender’s window, the port is gone regardless of how well you qualify — and by then you may have structured the entire move around it.

This is also why bridge financing and deposit loans belong in the conversation early rather than as an afterthought.

The sequencing question underneath all of this — whether to sell before you buy — is worked through in bridge financing in BC.

The lender has to want the new property

Your rate is portable. Their appetite for the property isn’t. Acreage, leasehold, a home with a suite they won’t count, an unusual property type, or something in condition they won’t advance on — any of these can end a port even where the borrower qualifies comfortably. The mortgage is being secured by a different asset, and that asset gets underwritten on its own merits.

The Variable-Rate Trap Nobody Mentions

This one is close to invisible in Canadian consumer content, and on an adjustable or variable mortgage it can quietly decide the whole question.

A variable rate isn’t a number the lender picks directly — it’s a discount off prime. Prime moves with the Bank of Canada, but the discount is set by the lender on the day you sign, and it’s locked for your term. What almost nobody realises is how much that discount moves between one cohort of borrowers and the next, or why.

When a lender’s treasury desk expects the policy rate to fall over the coming six to twelve months, two things follow. Their own funding math changes, and they know demand for variable products is about to rise — because falling rates make adjustable mortgages the obvious choice for more borrowers. The response is to narrow the discount. You still get prime minus something. It’s simply less minus than the previous cohort received.

Most BC borrowers are in uninsured mortgages, and move-up buyers especially so — until late 2024 mortgage insurance wasn’t available above a million-dollar purchase price at all, which in this province rules out a great many second homes. So the uninsured discount is the one that matters here, and it moves more than people realise.

Tracking one major lender’s discount on its conventional uninsurable owner-occupied adjustable mortgage: at the end of 2022 it sat around four-tenths of a point below prime. By spring 2024 it had narrowed to roughly fifteen-hundredths — a quarter-point worse for anyone signing then. By that November it had widened again to half a point below prime, better than where it started.

Prime itself moved in one direction over that stretch. The discount moved in both, by a quarter point each way, on the lender’s own read of where demand was heading. A borrower who signed in spring 2024 locked the worst discount of a three-year window, for five years, and nothing about prime told them that.

Now put that together with porting. Suppose you hold a variable at a good discount with a year or so left on the term. You move, and you port. You’ve protected that discount for the remaining year — and then the term ends, and you reprice into whatever is being offered on the day, which may be materially better or materially worse than what you were defending.

That’s the part worth sitting with: the discount you locked is not reliably the prize. A borrower who pays the penalty on a variable — three months’ interest, not an interest rate differential — and takes a fresh five-year term gets today’s discount, known and locked, for five years. A borrower who ports keeps an old discount briefly and then rolls the dice on an unknown one at a moment they didn’t choose. Neither is guaranteed better. But only one of them is a decision rather than a default.

One practical footnote: not every lender permits porting a variable at all. It’s worth confirming that yours does before the question becomes urgent.

When Porting Genuinely Works

It isn’t a trap, and there are files where it’s clearly right.

When the rate you hold is far below anything currently available. The wider the gap, the more the ported portion is worth protecting, and the more blend it can absorb before the advantage disappears.

When there’s enough term left for it to be worth protecting. A wide gap with four years to run is worth real money. The same gap with a year or eighteen months remaining usually isn’t, because once the lender’s blending math is applied — big-bank blending math in particular — the result comes out close to a wash. Time remaining is half the value of a below-market rate, and it’s the half people forget to check.

When the balance isn’t growing much. A lateral move, or a downsize, or a purchase where the new mortgage is close to the old one. Little new money means little dilution — this is the strongest case for porting and it’s the opposite of the situation most people are in when they ask about it.

When the timing genuinely lines up. Same-day completions, or dates comfortably inside the lender’s window.

When the new property is straightforward. Nothing about it requires the lender to make an exception.

Where all five hold, porting is a real saving and should be used. The point of this page isn’t that porting is bad. It’s that these five conditions are the exception among move-up buyers rather than the norm, and the feature is marketed as though the reverse were true.

What to Do Instead of Assuming

Run both numbers before you commit to anything.

Option A: the ported deal, at its actual blended rate across the full new balance, with any port fees.

Option B: break the mortgage, pay the penalty, and take a fresh mortgage at market — including what the penalty genuinely is rather than what you fear it is, since the calculation differs enormously between lenders.

Compare total cost over the term, not rate against rate. Option B carries a cost you can see and dislike; Option A carries one buried in a blend where it’s easy to miss. That asymmetry is why the comparison so often doesn’t get made.

One structural note worth knowing before your next term: a variable mortgage’s penalty is three months’ interest, while a fixed mortgage’s can be an interest rate differential many times larger. That difference is the flexibility question that actually matters — because when breaking is cheap, whether you can port stops being a decision you’re trapped by. If you expect to move mid-term, that consideration belongs in the fixed-versus-variable conversation from the start, not discovered later.

And if you’re planning a move-up purchase now, the sequencing of sale, purchase and financing is the whole game — see our approach to move-up buyers. On choosing someone to run this comparison honestly, see choosing a mortgage broker for renewals and refinancing in BC.

Frequently Asked Questions

What does porting a mortgage mean?

Taking your existing mortgage with you when you move — keeping the same rate and remaining term on the new property instead of breaking the mortgage and paying a prepayment penalty. Most mortgages in Canada are portable, though the conditions attached vary considerably between lenders.

Does porting keep my old rate on the whole new mortgage?

No, and this is the single biggest misunderstanding. You keep the old rate only on the amount you’re porting. Any additional money needed for a larger purchase is priced separately at current rates, and the two are blended into one rate across the full balance. The more new money involved, the less your old rate affects the final number.

Do I have to requalify to port my mortgage?

Yes. Porting is a new application against the new property, fully underwritten with your current income, current debts and current qualifying rules. It is not a transfer of your existing approval. If your circumstances have changed since you last qualified, test the port before removing subjects on a purchase.

How long do I have between selling and buying to port a mortgage?

Lenders allow a limited number of days between the two completions, and the windows differ — some are shorter than people expect. BC sales and purchases frequently complete weeks apart, so this is a common reason ports fail. Confirm your lender’s specific window before you build a plan around porting.

Is it better to port or to break my mortgage and start fresh?

Run both. Compare the ported deal’s blended rate across the full new balance against a fresh mortgage at market, minus the penalty. Compare total cost over the term rather than rate against rate. Porting wins when your existing rate is far below market and you’re not adding much new money; a fresh mortgage frequently wins on a substantial move up.

Can my lender refuse to let me port?

Effectively yes, in several ways. You may not requalify, your completion dates may fall outside their porting window, or the new property may be one they won’t lend against — acreage, leasehold, unusual property types and condition issues all come up. Your rate is portable; their appetite for the new property is a separate question.

Should I port a variable-rate mortgage?

Be careful here, because a variable rate is a discount off prime and that discount is locked only for your current term. On uninsured mortgages — which is most BC borrowers, and nearly all move-up buyers — that discount moves a great deal. One major lender’s uninsured owner-occupied adjustable discount went from about four-tenths of a point below prime at the end of 2022, to roughly fifteen-hundredths by spring 2024, to half a point below prime that November. Porting protects your existing discount until the term ends, then reprices you into whatever is on offer that day. Paying the penalty on a variable costs three months’ interest, not an interest rate differential, so taking a fresh five-year term at a known discount is often the better trade. Not every lender permits porting a variable in the first place.

Before You Structure a Move Around a Port

The comparison takes one conversation and it’s worth having before an offer, not after. What you owe, what you’d need, what your penalty actually is, and what the blended result looks like against simply starting fresh.

Sometimes the answer is that porting is clearly right and we’ll tell you so. More often the interesting finding is how little the old rate was worth once it was blended — which is a much better thing to learn before you’ve built a move around it.

Call or text 604-833-4663 (HOME) or book a free, zero-pressure strategy session.

Every mortgage we arrange goes into HomeBrew, so when a move starts becoming likely the numbers are already on file rather than assembled under pressure.

About the author: Michael Lloyd has been in mortgage lending since 1988 and a licensed mortgage broker since 1999 (BCFSA licence #087740). He founded and led DLC Canadian Mortgage Experts to over $1.8 billion in annual mortgage volume before returning to full-time client work. Michael leads The HomeHappy Team @ Canadian Mortgage Experts, co-brokering under Indi Mortgage, serving homeowners across British Columbia with strategy-first mortgage planning and lifetime mortgage management. In 2017, he testified before the House of Commons Standing Committee on Finance on Canada’s mortgage rules — two of his three recommendations became federal policy in 2024.