GDS/TDS Ratios Explained

Josh Perez • June 26, 2024

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.

Josh Perez
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New to Credit? Let’s Build a Solid Foundation

By Josh Perez • September 24, 2025
Starting from Scratch: How to Build Credit the Smart Way If you're just beginning your personal finance journey and wondering how to build credit from the ground up, you're not alone. Many people find themselves stuck in the classic credit paradox: you need credit to build a credit history, but you can’t get credit without already having one. So, how do you break in? Let’s walk through the basics—step by step. Credit Building Isn’t Instant—Start Now First, understand this: building good credit is a marathon, not a sprint. For those planning to apply for a mortgage in the future, lenders typically want to see at least two active credit accounts (credit cards, personal loans, or lines of credit), each with a limit of $2,500 or more , and reporting positively for at least two years . If that sounds like a lot—it is. But everyone has to start somewhere, and the best time to begin is now. Step 1: Start with a Secured Credit Card When you're new to credit, traditional lenders often say “no” simply because there’s nothing in your file. That’s where a secured credit card comes in. Here’s how it works: You provide a deposit—say, $1,000—and that becomes your credit limit. Use the card for everyday purchases (groceries, phone bill, streaming services). Pay the balance off in full each month. Your activity is reported to the credit bureaus, and after a few months of on-time payments, you begin to establish a credit score. ✅ Pro tip: Before you apply, ask if the lender reports to both Equifax and TransUnion . If they don’t, your credit-building efforts won’t be reflected where it counts. Step 2: Move Toward an Unsecured Trade Line Once you’ve got a few months of solid payment history, you can apply for an unsecured credit card or a small personal loan. A car loan could also serve as a second trade line. Again, make sure the account reports to both credit bureaus, and always pay on time. At this point, your focus should be consistency and patience. Avoid maxing out your credit, and keep your utilization under 30% of your available limit. What If You Need a Mortgage Before Your Credit Is Ready? If homeownership is on the horizon but your credit history isn’t quite there yet, don’t panic. You still have a few options. One path is to apply with a co-signer —someone with strong credit and income who is willing to share the responsibility. The mortgage will be based on their credit profile, but your name will also be on the loan, helping you build a record of mortgage payments. Ideally, when the term is up and your credit has matured, you can refinance and qualify on your own. Start with a Plan—Stick to It Building credit may take a couple of years, but it all starts with a plan—and the right guidance. Whether you're figuring out your first steps or getting mortgage-ready, we’re here to help. Need advice on credit, mortgage options, or how to get started? Let’s talk.

Bank of Canada Rate Announcement Sept 17th, 2025

By Josh Perez • September 17, 2025
Bank of Canada lowers policy rate to 2½%.  FOR IMMEDIATE RELEASE Media Relations Ottawa, Ontario September 17, 2025 The Bank of Canada today reduced its target for the overnight rate by 25 basis points to 2.5%, with the Bank Rate at 2.75% and the deposit rate at 2.45%. After remaining resilient to sharply higher US tariffs and ongoing uncertainty, global economic growth is showing signs of slowing. In the United States, business investment has been strong but consumers are cautious and employment gains have slowed. US inflation has picked up in recent months as businesses appear to be passing on some tariff costs to consumer prices. Growth in the euro area has moderated as US tariffs affect trade. China’s economy held up in the first half of the year but growth appears to be softening as investment weakens. Global oil prices are close to their levels assumed in the July Monetary Policy Report (MPR). Financial conditions have eased further, with higher equity prices and lower bond yields. Canada’s exchange rate has been stable relative to the US dollar. Canada’s GDP declined by about 1½% in the second quarter, as expected, with tariffs and trade uncertainty weighing heavily on economic activity. Exports fell by 27% in the second quarter, a sharp reversal from first-quarter gains when companies were rushing orders to get ahead of tariffs. Business investment also declined in the second quarter. Consumption and housing activity both grew at a healthy pace. In the months ahead, slow population growth and the weakness in the labour market will likely weigh on household spending. Employment has declined in the past two months since the Bank’s July MPR was published. Job losses have largely been concentrated in trade-sensitive sectors, while employment growth in the rest of the economy has slowed, reflecting weak hiring intentions. The unemployment rate has moved up since March, hitting 7.1% in August, and wage growth has continued to ease. CPI inflation was 1.9% in August, the same as at the time of the July MPR. Excluding taxes, inflation was 2.4%. Preferred measures of core inflation have been around 3% in recent months, but on a monthly basis the upward momentum seen earlier this year has dissipated. A broader range of indicators, including alternative measures of core inflation and the distribution of price changes across CPI components, continue to suggest underlying inflation is running around 2½%. The federal government’s recent decision to remove most retaliatory tariffs on imported goods from the US will mean less upward pressure on the prices of these goods going forward. With a weaker economy and less upside risk to inflation, Governing Council judged that a reduction in the policy rate was appropriate to better balance the risks. Looking ahead, the disruptive effects of shifts in trade will continue to add costs even as they weigh on economic activity. Governing Council is proceeding carefully, with particular attention to the risks and uncertainties. Governing Council will be assessing how exports evolve in the face of US tariffs and changing trade relationships; how much this spills over into business investment, employment, and household spending; how the cost effects of trade disruptions and reconfigured supply chains are passed on to consumer prices; and how inflation expectations evolve. The Bank is focused on ensuring that Canadians continue to have confidence in price stability through this period of global upheaval. We will support economic growth while ensuring inflation remains well controlled. Information note The next scheduled date for announcing the overnight rate target is October 29, 2025. The Bank’s October Monetary Policy Report will be released at the same time.