Porting means taking the mortgage you already have, with its rate and its remaining term, and moving it over to the home you are buying next. You keep the rate you locked in, and you usually avoid the prepayment penalty that comes with breaking a mortgage early. Porting is not automatic, though. You have to requalify with the lender, the timing of your sale and purchase has to fit inside their window, and if you need to borrow more for the bigger house, the extra money comes at today’s rate blended with your old one.
That is the short version. Now let me walk you through what it actually looks like when someone is living it, because the details are where people get caught.
A real-feeling example
Say a family in Barrie locked a five-year fixed mortgage three years ago, back when rates were lower than they are now. They have two years left on the term. The kids are bigger, the house is smaller than it used to feel, and they have found a place in Oro-Medonte with a yard.
Their first instinct is to break the mortgage and start fresh. Then they see the penalty and their stomach drops.
Porting is the door out of that. Their good rate travels with them to the new house for the remaining two years, and the penalty either disappears or gets refunded. The nice part is that nobody had to be clever here. They just had to know the option existed and ask about it before they signed anything.
What porting actually does, and what it does not
Porting moves three things:
– Your interest rate
– Your remaining term (the time left before renewal)
– Your existing mortgage balance
Porting does not move your home. The mortgage is secured against a property, so when you sell, the old security comes off and the new property goes on. Your lender treats it as a new application on a new home, using your old rate.
Porting also does not automatically give you a bigger mortgage. If your next home costs more and you need to borrow more, that extra piece is new money at today’s rate. Which brings us to the part most people have never heard of.
The blended rate, in plain words
When you port and you need more money, the lender does not give you two separate mortgages. They combine your old balance at your old rate with the new money at today’s rate, and they calculate one weighted average. That single number becomes your new rate. This is called a blend.
Here is a simple, illustrative way to picture it. Imagine you are pouring two jugs of water into one bucket. One jug is big and cool, one is smaller and warm. What comes out is one temperature, somewhere between the two, leaning toward whichever jug was bigger. Your rate works the same way. If most of your mortgage is the old balance, the blend lands close to your old rate. If you are borrowing a lot more, the blend leans toward today’s number.
There are two common versions:
Blend and extend. The lender blends the rates and restarts the clock on a full new term, often five years. You get a fresh term at the blended rate.
Blend to term. The lender blends the rates but keeps your original maturity date. Your term does not get longer.
Neither one is automatically better. Blend and extend can make sense if you want a longer runway at a decent rate. Blend to term can make sense if you would rather get back to the open market sooner. It depends on where rates are and what you want your next five years to look like.
You still have to requalify
This is the piece that surprises people most, so I would rather you hear it from me now than from a lender in the middle of a stressful week.
Even though it is the same mortgage, the lender is underwriting a new property with you on it. They will look at your income, your credit, your other debts, and the new home itself. They will run the stress test. If your income has dropped, or you have taken on a car loan and some credit card balances since you first got approved, the numbers may not work the way they did three years ago.
Two honest implications. First, check your approval before you write an offer, not after. Second, if you are carrying high-interest debt, it can be worth cleaning that up before you go shopping, because those monthly payments eat into what you qualify for.
Timing, and the window nobody mentions
Most lenders give you a window to port, often somewhere in the range of 30 to 120 days between the sale of your old home and the purchase of your new one. Some are shorter. Some let you buy first and sell after, some do not.
Your closing dates have to land inside that window, and the window is set by your lender’s policy, not by you or your realtor. So the very first phone call in a move-up plan should be to find out what your specific lender allows. Dates get chosen early in a real estate deal and they are hard to change later.
If your dates fall outside the window, porting is off the table and you are back to breaking the mortgage and paying the penalty.
When porting is not the right move
Porting sounds like a free win, and often it is. A few cases where it is worth looking harder:
Your old rate is higher than today’s. If rates have come down since you locked in, carrying your old rate forward costs you. Breaking and taking a new mortgage at a better rate can be worth the penalty. Run the math both ways before you decide.
You need a lot more money. Once the new money is most of the mortgage, the blend lands close to today’s rate anyway, and the benefit of porting shrinks.
Your current lender’s products do not fit anymore. Maybe you want a re-advanceable setup, or you need a lender who understands a rural property or self-employment income. Staying put to save a penalty is not worth ending up in a mortgage that fights you for five years.
You are moving out of province or into a property type they do not lend on. Cottages, acreage, and unusual properties can fall outside a lender’s box.
What to do this month if a move is on your mind
Call your lender or your broker and ask three questions. Is my mortgage portable. What is my porting window in days. What would my penalty be if I did not port. Write the three answers down.
That is it. Three answers, and you suddenly know whether you are shopping with your good rate in your pocket or starting from scratch, which changes how much house you can actually consider.
Frequently asked questions
Is my mortgage portable?
Most fixed-rate mortgages from major lenders are portable, but not all of them, and variable-rate mortgages are portable less often. Some private and alternative lenders do not offer porting at all. Your commitment letter will say, and one phone call to your lender or broker will confirm it.
Does porting mean I avoid the prepayment penalty?
Usually, yes. Many lenders charge the penalty at closing and then refund it once the port completes on the new home. Some waive it outright. Ask your lender which way they handle it so the money does not catch you off guard at the lawyer’s office.
Can I port my mortgage if I am buying a more expensive home?
Yes. Your existing balance comes over at your old rate, and the extra money you need is added at today’s rate. The two get blended into one rate, and you have to qualify for the larger total amount.
What happens if I am downsizing and need a smaller mortgage?
You can usually port a smaller amount, but the piece you are not carrying forward may be treated as a prepayment, which can trigger a partial penalty. Ask your lender how they calculate it before you commit to a sale price.
How long do I have between selling and buying to port?
It varies by lender, commonly somewhere between 30 and 120 days. Since your closing dates get locked in early, find out your specific window before you make an offer.
About the author
Lora Fenn, Mortgage Agent L1, DLC Yellow Brick Mortgages (Brokerage Licence #13854), a Barrie mortgage agent who helps Ontario homeowners and buyers find another path when the bank says no, serving Barrie, Simcoe County and all of Ontario.
Thinking about your next home?
Book a free 15-minute equity-and-rate chat and we will look at whether porting makes sense for you, what your penalty would be either way, and what your real budget is for the next place. Plain words, no pressure, and you will leave with clear numbers.
You can also grab the free guide at lorafenn.ca/free-home-equity-guide-for-ontario-homeowners.
*This page is general education, not financial advice. Any figures are illustrative only and subject to lender approval (O.A.C.). Lora Fenn, Mortgage Agent Level 1, Lic. #M25003153, DLC Yellow Brick Mortgages (Brokerage Licence #13854).*
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