Porting a Mortgage in BC: Taking Your Rate With You When You Move

You bought a condo in Surrey or Langley a couple of years ago, locked in a rate you're happy with, and now you want more space. The obvious worry is your mortgage: if today's rates are higher than yours, do you have to give up the good rate and take a new one on the bigger home? Not necessarily. Porting lets you carry your existing mortgage, at its existing rate, to the new property instead of breaking it and paying a penalty. It's one of the most useful tools a move-up buyer has, and one of the least understood.

This is a plain-English guide to how porting works in BC, where it helps, and where first-time and move-up buyers get caught out.

What porting actually is

When you break a mortgage before the end of its term, the lender usually charges a prepayment penalty, and on a fixed-rate mortgage that penalty can be large. Porting is the alternative. Instead of ending the mortgage, you move it to the new home. The rate, the remaining term, and the balance come with you. You keep paying the mortgage you already have, just secured against a different property.

The value is simple to see. If you borrowed at a rate that's lower than what lenders are offering now, keeping that rate is worth real money over the rest of the term, and you avoid the penalty for breaking. For a buyer who locked in during a lower-rate stretch and is now moving up, porting can be the single biggest saving in the whole transaction.

But porting is a feature of your specific mortgage contract, not an automatic right. Most fixed-rate mortgages from major lenders are portable, but the terms differ, and some discounted or no-frills products are not portable at all. The first step is to read your mortgage agreement or ask your broker whether your mortgage can be ported before you build a plan around it.

You still have to qualify

Here's the part that surprises people. Porting keeps your old rate, but it does not exempt you from qualifying. When you port to a new property, you generally have to re-qualify for the mortgage on that property under current rules, including the stress test, the rule that qualifies you at the higher of your contract rate plus two percent or a set minimum. Our guide to the stress test explains how that qualifying rate works.

That matters because your situation may have changed since you first got the mortgage. A new car loan, a change in income, or a larger purchase price can all affect whether you qualify for the size of mortgage the new home needs. We've seen buyers assume porting was a formality, only to learn the new home pushed them past what they could carry under today's rules. Porting is a rate benefit, not a qualifying shortcut.

The takeaway: before you list your current place, talk to your broker about porting and re-qualifying together. If there's a gap between what you can port and what the new home costs, you want to know that early, not on offer day.

The blended rate when you borrow more

Most move-up buyers need a bigger mortgage for the new home. Porting handles this with a blend. You keep your old rate on your old balance, and you borrow the additional money at today's rate. The lender combines the two into a blended rate that sits somewhere between your old rate and the current one, weighted by how much of each you're carrying.

The practical effect is that your effective rate drifts up as the new borrowing grows. If you're only borrowing a little more, the blend stays close to your old rate. If the new home is much more expensive and you need a lot of new money, the blend moves closer to today's rate. Porting still helps, because you're not paying the penalty and you're keeping the cheaper rate on the old portion, but it's not the same as carrying your whole mortgage at the old rate.

Ask your broker to show you the blended rate and the resulting payment for your actual numbers. A blend that looks fine on a small increase can feel very different when the new mortgage is substantially larger. This is also where our guide to how much house you can afford and the total monthly cost of owning become useful, the blended payment is the number your budget actually has to absorb.

Timing is where porting falls apart

The most common reason porting doesn't happen is timing. Lenders give you a porting window, the period between selling your old home and buying the new one within which the port has to complete. That window varies by lender. Some are generous, allowing a few months. Others are tight, measured in days. If your sale and your purchase don't close close enough together, you can miss the window and lose the ability to port entirely.

This is a real risk in a market where you might sell before you've found the next place, or find the next place before yours has sold. A buyer who sells in June and doesn't close on a new home until September may be outside a short porting window, even though everything else lined up. Our piece on buying before selling and bridge financing covers the timing gymnastics of move-up moves, and porting adds another clock to watch.

The fix is to confirm your lender's exact porting window before you make any moves, and to coordinate your sale and purchase dates with that window in mind. If your lender allows a longer window, you have more room to breathe. If it's short, you may need to align closings tightly or reconsider whether porting is realistic for your situation.

When porting isn't the right call

Porting is usually the winner when your current rate is well below today's rates. But it isn't always the best move. If current rates are lower than yours, breaking the mortgage and starting fresh at the cheaper rate might save more than porting the old higher rate, even after the penalty. And if a different lender is offering enough of a discount, the savings can sometimes justify breaking and switching.

Downsizing complicates things too. If your new home needs a smaller mortgage than your current one, porting the full balance may not work, and reducing the mortgage can itself trigger a partial prepayment penalty on the amount you pay off early. Porting is cleanest when the new mortgage is the same size or larger. If you're borrowing less, ask your lender how the reduction is treated before you assume porting saves you money.

The honest answer is that porting versus breaking is a numbers question, and the numbers are specific to you: your current rate, today's rates, your penalty, and the new mortgage size. This is squarely a conversation for your mortgage broker, who can run both scenarios side by side. Our comparison of a mortgage broker versus your bank explains why a broker's access to multiple lenders matters here, porting rules differ from lender to lender, and a broker can tell you whose terms actually suit a move.

What to do before you list

If you think you might move and want to keep your rate, the homework is straightforward. Pull out your mortgage agreement or ask your broker three things: is my mortgage portable, what is the porting window, and what happens to my rate if I borrow more. Those three answers tell you whether porting is on the table and how much it's worth.

Then get re-qualified early, before you're emotionally committed to a specific new home. Knowing your porting ceiling, the largest mortgage you can carry while porting, keeps your search realistic and stops you from writing an offer you can't actually finance at the old rate.

Porting is one of those tools that rewards planning and punishes surprise. The move-up buyers we've seen do best on this are the ones who asked about it months before they listed, not the ones who heard the word for the first time when their offer was already accepted. Because porting touches your mortgage contract and can involve penalties, confirm the details with your mortgage broker and, where money is moving between closings, your real estate lawyer before you commit.

If you're thinking about moving up in the Fraser Valley and want to understand how your existing mortgage fits the plan, book a low-key chat with the FRIVE team and we'll help you line up the questions to ask your broker, or browse current listings to see what your next place might look like.