How Do You Port a Mortgage?

Lisa Manwaring • August 13, 2025

Porting your mortgage is when you transfer the remainder of your current mortgage term, outstanding principal balance, and interest rate to a new property if you’re selling your existing home and buying a new one.


Now, despite what some big banks would lead you to believe, porting your mortgage is not an easy process. It’s not a magic process that guarantees you will qualify to purchase a new property using the mortgage you had on a previous property.


In addition to re-qualifying for the mortgage you already have, the lender will also assess the property you’re looking to purchase. Many moving parts come into play. You’re more likely to have significant setbacks throughout the process than you are to execute a flawless port. Here are some of the reasons:


You may not qualify for the mortgage


Let’s say you’re moving to a new city to take a new job. If you’re relying on porting your mortgage to buy a new property, you’ll have to substantiate your new income. If you’re on probation or changed professions, there’s a chance the lender will decline your application. Porting a mortgage is a lot like qualifying for a new mortgage, just with more conditions.


The property you are buying has to be approved


So let’s say that your income isn’t an issue and that you qualify for the mortgage. The subject property you want to purchase has to be approved as well. Just because the lender accepted your last property as collateral for the mortgage doesn’t mean the lender will accept the new property. The lender will require an appraisal and scrutinize the condition of the property you’re looking to buy.


Property values are rarely the same


Chances are, if you’re selling a property and buying a new one, there’ll be some price difference. When looking to port a mortgage, if the new property’s value is higher than your previous property, requiring a higher mortgage amount, you’ll most likely have to take a blended rate on the new money, which could increase your payment. If the property value is considerably less, you might incur a penalty to reduce the total mortgage amount.


You still need a downpayment


Porting a mortgage isn’t just a simple case of swapping one property for another while keeping the same mortgage. You’re still required to come up with a downpayment on the new property.


You’ll most likely have to pay a penalty


Most lenders will charge the total discharge penalty when you sell your property and take it from the sale proceeds. The penalty is then refunded when you execute the port and purchase the new property. So if you are relying on the proceeds of sale to come up with your downpayment, you might have to make other arrangements.


Timelines rarely work out


When assessing the housing market, It’s usually a buyer’s market or a seller’s market, not both at the same time. So although you may be able to sell your property overnight, you might not be able to find a suitable property to buy. Alternatively, you may be able to find many suitable properties to purchase while your house sits on the market with no showings.


And, chances are, when you end up selling your property and find a new property to buy, the closing dates rarely match up perfectly.


Different lenders have different port periods


Understanding that different lenders have different port periods is where the fine print in the mortgage documents comes into play. Did you know that depending on the lender, the time you have to port your mortgage can range from one day to six months? So if it’s one day, your lawyer will have to close both the sale of your property and the purchase of your new property on the same day, or the port won’t work.


Or, with a more extended port period, you run the risk of selling your house with the intention of porting the mortgage, only to not be able to find a suitable property to buy.


So while the idea of porting your mortgage can seem like a good idea, and it might even make sense if you have a low rate that you want to carry over to a property of similar value, it’s always a good idea to get professional mortgage advice and look at all your options.


While porting your mortgage is a nice feature to have because it provides you with options, please understand that it is not a guarantee that you’ll be able to swap out properties and keep making the same payments. There’s a lot to know.


If you’re looking to sell your existing property and buy a new one, please connect anytime. It would be a pleasure to walk you through the process and help you consider all your options, including a port if that makes the most sense!


LISA MANWARING

MORTGAGE EXPERT

LET'S TALK

RECENT POSTS

What Are GDS/TDS Ratios Anyways?

By Lisa Manwaring • October 22, 2025
One of the major qualifiers lenders look at when considering your application for mortgage financing is your debt service ratios. Now, before we get started, if you prefer to have someone walk through these calculations with you, assess your financial situation, and let you know exactly where you stand, let’s connect. There is no use in dusting off the calculator and running the numbers yourself when we can do it for you! However, if you’re someone who likes to know the nitty-gritty of how things work instead of simply accepting that's just the way it is, this article is for you. But be warned, there are a lot of mortgage words and some math ahead; with that out of the way, let’s get started! “Debt servicing” is the measure of your ability to meet all of your financial obligations. There are two ratios that lenders examine to determine whether you can debt service a mortgage. The first is called the “gross debt service” ratio, or GDS, which is the percentage of your monthly household income that covers your housing costs. The second is called the “total debt service” ratio, or TDS, which is the percentage of your monthly household income covering your housing costs and all your other debts. GDS is your income compared to the cost of financing the mortgage, including your proposed mortgage payments (principal and interest), property taxes, and heat (PITH), plus a percentage of your condo fees (if applicable). Here’s how to calculate your GDS. Principal + Interest + Taxes + Heat / Gross Annual Income Your TDS is your income compared to your GDS plus the payments made to service any existing debts. Debts include car loans, line of credit, credit card payments, support payments, student loans, and anywhere else you’re contractually obligated to make payments. Here’s how to calculate your TDS. Principal + Interest + Taxes + Heat + Other Debts / Gross Annual Income With the calculations for those ratios in place, the next step is to understand that each lender has guidelines that outline a maximum GDS/TDS. Exceeding these guidelines will result in your mortgage application being declined, so the lower your GDS/TDS, the better. If you don’t have any outstanding debts, your GDS and TDS will be the same number. This is a good thing! The maximum ratios vary for conventional mortgage financing based on the lender and mortgage product being offered. However, if your mortgage is high ratio and mortgage default insurance is required, the maximum GDS is 39% with a maximum TDS of 44%. So how does this play out in real life? Well, let’s say you’re currently looking to purchase a property with a payment of $1700/mth (PITH), and your total annual household income is $90,000 ($7500/mth). The calculations would be $1700 divided by $7500, which equals 0.227, giving you a gross debt service ratio of 22.7%. A point of clarity here. When calculating the principal and interest portion of the payment, the Government of Canada has instituted a stress test. It requires you to qualify using the government's qualifying rate (which is higher), not the actual contract rate. This is true for both fixed and variable rate mortgages. Now let’s continue with the scenario. Let’s say that in addition to the payments required to service the property, you have a car payment of $300/mth, child support payments of $500/mth, and between your credit cards and line of credit, you’re responsible for another $700/mth. In total, you pay $1500/mth. So when you add in the $1700/mth PITH, you arrive at a total of $3200/mth for all of your financial obligations. $3200 divided by $7500 equals 0.427, giving you a total debt service ratio of 42.7%. Here’s where it gets interesting. Based on your GDS alone, you can easily afford the property. But when you factor in all your other expenses, the TDS exceeds the allowable limit of 42% (for an insured mortgage anyway). So why does this matter? Well, as it stands, you wouldn’t qualify for the mortgage, even though you are likely paying more than $1700/mth in rent. So then, to qualify, it might be as simple as shuffling some of your debt to lower payments. Or maybe you have 10% of the purchase price saved for a downpayment, changing the mortgage structure to 5% down and using the additional 5% to pay out a portion of your debt might be the difference you need to bring it all together. Here’s the thing, as your actual financial situation is most likely different than the one above, working with an independent mortgage professional is the best way to give yourself options. Don’t do this alone. Your best plan is to seek and rely on the advice provided by an experienced independent mortgage professional. While you might secure a handful of mortgages over your lifetime, we do this every day with people just like you. It’s never too early to start the conversation about mortgage qualification. Going over your application and assessing your debt service ratios in detail beforehand gives you the time needed to make the financial moves necessary to put yourself in the best financial position. So if you find yourself questioning what you can afford or if you want to discuss your GDS/TDS ratios to understand the mortgage process a little better, please get in touch. It would be a pleasure to work with you, we can get a preapproval started right away.

Start Smart: Get Pre-Approved for Your Mortgage

By Lisa Manwaring • October 15, 2025
Thinking of Buying a Home? Here’s Why Getting Pre-Approved Is Key If you’re ready to buy a home but aren’t sure where to begin, the answer is simple: start with a pre-approval. It’s one of the most important first steps in your home-buying journey—and here's why. Why a Pre-Approval is Crucial Imagine walking into a restaurant, hungry and excited to order, but unsure if your credit card will cover the bill. It’s the same situation with buying a home. You can browse listings online all day, but until you know how much you can afford, you’re just window shopping. Getting pre-approved for a mortgage is like finding out the price range you can comfortably shop within before you start looking at homes with a real estate agent. It sets you up for success and saves you from wasting time on properties that might be out of reach. What Exactly is a Pre-Approval? A pre-approval isn’t a guarantee. It’s not a promise that a lender will give you a mortgage no matter what happens with your finances. It’s more like a preview of your financial health, giving you a clear idea of how much you can borrow, based on the information you provide at the time. Think of it as a roadmap. After going through the pre-approval process, you’ll have a much clearer picture of what you can afford and what you need to do to make the final approval process smoother. What Happens During the Pre-Approval Process? When you apply for a pre-approval, lenders will look at a few key areas: Your income Your credit history Your assets and liabilities The property you’re interested in This comprehensive review will uncover any potential hurdles that could prevent you from securing financing later on. The earlier you identify these challenges, the better. Potential Issues a Pre-Approval Can Reveal Even if you feel confident that your finances are in good shape, a pre-approval might uncover issues you didn’t expect: Recent job changes or probation periods An income that’s heavily commission-based or reliant on extra shifts Errors or collections on your credit report Lack of a well-established credit history Insufficient funds saved for a down payment Existing debt reducing your qualification amount Any other financial blind spots you might not be aware of By addressing these issues early, you give yourself the best chance of securing the mortgage you need. A pre-approval makes sure there are no surprises along the way. Pre-Approval vs. Pre-Qualification: What’s the Difference? It’s important to understand that a pre-approval is more than just a quick online estimate. Unlike pre-qualification—which can sometimes be based on limited information and calculations—a pre-approval involves a thorough review of your finances. This includes looking at your credit report, providing detailed documents, and having a conversation with a mortgage professional about your options. Why Get Pre-Approved Now? The best time to secure a pre-approval is as soon as possible. The process is free and carries no risk—it just gives you a clear path forward. It’s never too early to start, and by doing so, you’ll be in a much stronger position when you're ready to make an offer on your dream home. Let’s Make Your Home Buying Journey Smooth A well-planned mortgage process can make all the difference in securing your home. If you’re ready to get pre-approved or just want to chat about your options, I’d love to help. Let’s make your home-buying experience a smooth and successful one!