GDS/TDS Ratios Explained

Amelia Mcleod • February 5, 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.

How To Get The Best Mortgage

By Amelia Mcleod • June 25, 2025
If you’re looking to buy a property or have a mortgage up for renewal, and you’re thinking about connecting with your bank directly, save yourself a lot of money and regret by reading this article first. Here are four things that your bank won’t tell you, accompanied by four reasons that explain why working with an independent mortgage professional is in your best interest. Banks have Limited Access to Mortgage Products. Now, while this one may seem pretty straightforward, if you’re dealing with a single institution, they can only offer mortgages from their product catalogue. This means that you’ll be restricted to their qualifications which are usually very narrow. Working with a single institution significantly limits your options, especially if your financial situation isn’t straightforward. In contrast, dealing with an independent mortgage professional, you will have access to products from over 200 lenders, including banks, monoline lenders, credit unions, finance companies, alternative lenders, institutional B lenders, Mortgage Investment Corporations, and private funds. Working with an independent mortgage professional will give you considerably more options to secure a better mortgage. Banks Employ Salespeople, not Mortgage Experts. Banks don’t employ mortgage experts; they employ salespeople. Banks pay and incentivize salespeople to sell their products. There is a fundamental misalignment of values here. If the bank incentivizes a banker to make a profit for the bank, how can they at the same time advocate for you and your best interest? They can’t. Banks don’t have your best interest in mind. In fact, the more money they make off of you, the better it is for their bottom line. However, when you work with an independent mortgage professional, you get the experience of someone who understands the intricacies of mortgage financing and will advocate on your behalf to get you the best mortgage. It’s actually in our best interest to assist you in finding the mortgage with the best terms for you. Once your mortgage completes, we get paid a standardized finder’s fee by the lender for arranging the financing. So although we get paid by the lender, that lender has had to compete with other lenders to earn your business. When you work with an independent mortgage professional, everyone wins. You get the best mortgage available, we get paid a standardized finder’s fee, and the lender gets a new borrower. Banks Rarely Offer You Their Best Terms Upfront. Banks are in the business of making money, and they’re usually pretty good at it. As such, banks will rarely offer you their best terms at the outset of your negotiation. This is especially true if you’re looking to refinance your existing mortgage. With over half of Canadians simply accepting the renewal offer they get sent in the mail without question, banks don’t have to put their best rate forward. Instead, they rely on you to be ignorant of the process and will take advantage of your trust in them. When you work with an independent mortgage professional, we don’t play games with rates and terms. Our goal is always to seek out the lender who has the best mortgage for you from the start of the process, and if there are any negotiations to be had, we handle them for you. There is no reason for us to do otherwise. In fact, the better we do our job, the more likely it is that you’ll be happy with our services and refer your friends and family. Banks Promote Restrictive Mortgage Products. As if it’s not bad enough that banks don’t offer their best terms upfront, they actually promote mortgage products that are restrictive in nature. The fine print in your mortgage contract matters; understanding it is challenging. Banks do what they can to make it hard for you to leave. Now, if you’ve ever heard stories of outrageous penalties being charged, this is what’s called an Interest Rate Differential penalty (IRD). Each lender has its own way of calculating the IRD. Chartered banks are known for their restrictive mortgages and high IRD penalties. When you work with an independent mortgage professional, we take the time to listen to your goals and assess your mortgage needs based on your life circumstances. The best mortgage is the one that lowers your overall cost of borrowing. So not only will we walk through the cost of the mortgage financing, but we’ll also clearly outline the costs incurred should you need to break your mortgage before the end of your term. This might be the deciding factor in choosing the right lender and mortgage for you. Working with an Independent Mortgage Professional is in Your Best Interest. Banks have limitations to the mortgage products they offer. Working with an independent mortgage professional gives you mortgage options! Bankers work for the bank; they are incentivized to make money for the bank. An independent mortgage professional advocates on your behalf to get you the best mortgage available. Banks rarely offer their best terms upfront; they leave negotiations up to you. An independent mortgage professional outlines the best terms from multiple lenders at the start of the process. Banks promote restrictive mortgage products that make it difficult to leave them. An independent mortgage broker will outline all the costs associated with different mortgage products and recommend the mortgage best suited for your needs. So if you’d like to talk about the best mortgage product for you, you’ve come to the right place. Please connect anytime. It would be a pleasure to work with you.

First-Time Homebuyer? A New GST Rebate Could Put Thousands Back in Your Pocket

By Amelia Mcleod • June 20, 2025
If you’re a first-time homebuyer eyeing a new build or major renovation, there's encouraging news that could make homeownership significantly more affordable. The federal government has proposed a new GST rebate aimed at easing the financial burden for Canadians entering the housing market. While still awaiting parliamentary approval, the proposed legislation offers the potential for thousands in savings —and could be a game-changer for buyers trying to break into today’s high-cost housing landscape. What’s Being Proposed? Under the new legislation, eligible first-time homebuyers would receive: A full GST rebate on homes priced up to $1 million A partial GST rebate on homes between $1 million and $1.5 million This could mean up to $50,000 in tax savings on a qualifying home—a major boost for anyone working hard to save for a down payment or meet mortgage qualification requirements. Why This Matters With interest rates still elevated and home prices holding steady in many regions, affordability remains a challenge. This rebate could offer meaningful relief in several ways: Lower Upfront Costs: Removing GST from the purchase price reduces the total amount of money buyers need to save before closing. Smaller Monthly Payments: A lower purchase price leads to a smaller mortgage, which translates to more manageable monthly payments. Improved Mortgage Qualification: With a reduced purchase amount, buyers may find it easier to meet lender criteria. According to recent estimates, a homebuyer purchasing a $1 million new home could see monthly mortgage payments drop by around $240 —money that could go toward savings, home improvements, or simply everyday expenses. Helping Families Help Each Other This proposal also offers a win for parents who are supporting their children in buying a first home. Whether through gifted down payments or co-signing, a lower purchase price and more affordable monthly costs mean that family support can go further—and set first-time buyers up for long-term success. Is This the Right Time to Buy? If you’re thinking about buying a new or substantially renovated home, this proposed rebate could dramatically improve your financial position. Now is the perfect time to explore your options and make sure your mortgage strategy is aligned with potential policy changes. 📞 Let’s connect for a free mortgage review or pre-approval. Whether you’re buying your first home or helping someone else take that first step, I’m here to help you make informed, confident decisions.