What Are GDS/TDS Ratios Anyways?

Tim Lacroix • October 9, 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.


Tim Lacroix

Mortgage Broker

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Smart Strategies to Save for Your Down Payment

By Tim Lacroix • September 24, 2025
How to Start Saving for a Down Payment (Without Overhauling Your Life) Let’s face it—saving money isn’t always easy. Life is expensive, and setting aside extra cash takes discipline and a clear plan. Whether your goal is to buy your first home or make a move to something new, building up a down payment is one of the biggest financial hurdles. The good news? You don’t have to do it alone—and it might be simpler than you think. Step 1: Know Your Numbers Before you can start saving, you need to know where you stand. That means getting clear on two things: how much money you bring in and how much of it is going out. Figure out your monthly income. Use your net (after-tax) income, not your gross. If you’re self-employed or your income fluctuates, take an average over the last few months. Don’t forget to include occasional income like tax returns, bonuses, or government benefits. Track your spending. Go through your last 2–3 months of bank and credit card statements. List out your regular bills (rent, phone, groceries), then your extras (dining out, subscriptions, impulse buys). You might be surprised where your money’s going. This part isn’t always fun—but it’s empowering. You can’t change what you don’t see. Step 2: Create a Plan That Works for You Once you have the full picture, it’s time to make a plan. The basic formula for saving is simple: Spend less than you earn. Save the difference. But in real life, it’s more about small adjustments than major sacrifices. Cut what doesn’t matter. Cancel unused subscriptions or set a dining-out limit. Automate your savings. Set up a separate “down payment” account and auto-transfer money on payday—even if it’s just $50. Find ways to boost your income. Can you pick up a side job, sell unused stuff, or ask for a raise? Consistency matters more than big chunks. Start small and build momentum. Step 3: Think Bigger Than Just Saving A lot of people assume saving for a down payment is the first—and only—step toward buying a home. But there’s more to it. When you apply for a mortgage, lenders look at: Your income Your debt Your credit score Your down payment That means even while you’re saving, you can (and should) be doing things like: Building your credit score Paying down high-interest debt Gathering documents for pre-approval That’s where we come in. Step 4: Get Advice Early Saving up for a home doesn’t have to be a solo mission. In fact, talking to a mortgage professional early in the process can help you avoid missteps and reach your goal faster. We can: Help you calculate how much you actually need to save Offer tips to strengthen your application while you save Explore alternate down payment options (like gifts or programs for first-time buyers) Build a step-by-step plan to get you mortgage-ready Ready to get serious about buying a home? We’d love to help you build a plan that fits your life—and your goals. Reach out anytime for a no-pressure conversation.

Bank of Canada Rate Announcement Sept 17th, 2025

By Tim Lacroix • 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.