What Are GDS/TDS Ratios Anyways?

Carmelo Mamertino • March 26, 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.


Carmelo Mamertino

Bank of Canada Rate Announcement Jul 30th, 2025

By Carmelo Mamertino • July 30, 2025
Bank of Canada holds policy rate at 2¾%. FOR IMMEDIATE RELEASE Media Relations Ottawa, Ontario July 30, 2025 The Bank of Canada today maintained its target for the overnight rate at 2.75%, with the Bank Rate at 3% and the deposit rate at 2.70%.  While some elements of US trade policy have started to become more concrete in recent weeks, trade negotiations are fluid, threats of new sectoral tariffs continue, and US trade actions remain unpredictable. Against this backdrop, the July Monetary Policy Report (MPR) does not present conventional base case projections for GDP growth and inflation in Canada and globally. Instead, it presents a current tariff scenario based on tariffs in place or agreed as of July 27, and two alternative scenarios—one with an escalation and another with a de-escalation of tariffs. While US tariffs have created volatility in global trade, the global economy has been reasonably resilient. In the United States, the pace of growth moderated in the first half of 2025, but the labour market has remained solid. US CPI inflation ticked up in June with some evidence that tariffs are starting to be passed on to consumer prices. The euro area economy grew modestly in the first half of the year. In China, the decline in exports to the United States has been largely offset by an increase in exports to the rest of the world. Global oil prices are close to their levels in April despite some volatility. Global equity markets have risen, and corporate credit spreads have narrowed. Longer-term government bond yields have moved up. Canada’s exchange rate has appreciated against a broadly weaker US dollar. The current tariff scenario has global growth slowing modestly to around 2½% by the end of 2025 before returning to around 3% over 2026 and 2027. In Canada, US tariffs are disrupting trade but overall, the economy is showing some resilience so far. After robust growth in the first quarter of 2025 due to a pull-forward in exports to get ahead of tariffs, GDP likely declined by about 1.5% in the second quarter. This contraction is mostly due to a sharp reversal in exports following the pull-forward, as well as lower US demand for Canadian goods due to tariffs. Growth in business and household spending is being restrained by uncertainty. Labour market conditions have weakened in sectors affected by trade, but employment has held up in other parts of the economy. The unemployment rate has moved up gradually since the beginning of the year to 6.9% in June and wage growth has continued to ease. A number of economic indicators suggest excess supply in the economy has increased since January. In the current tariff scenario, after contracting in the second quarter, GDP growth picks up to about 1% in the second half of this year as exports stabilize and household spending increases gradually. In this scenario, economic slack persists in 2026 and diminishes as growth picks up to close to 2% in 2027. In the de-escalation scenario, economic growth rebounds faster, while in the escalation scenario, the economy contracts through the rest of this year. CPI inflation was 1.9% in June, up slightly from the previous month. Excluding taxes, inflation rose to 2.5% in June, up from around 2% in the second half of last year. This largely reflects an increase in non-energy goods prices. High shelter price inflation remains the main contributor to overall inflation, but it continues to ease. Based on a range of indicators, underlying inflation is assessed to be around 2½%. In the current tariff scenario, total inflation stays close to 2% over the scenario horizon as the upward and downward pressures on inflation roughly offset. There are risks around this inflation scenario. As the alternative scenarios illustrate, lower tariffs would reduce the direct upward pressure on inflation and higher tariffs would increase it. In addition, many businesses are reporting costs related to sourcing new suppliers and developing new markets. These costs could add upward pressure to consumer prices. With still high uncertainty, the Canadian economy showing some resilience, and ongoing pressures on underlying inflation, Governing Council decided to hold the policy interest rate unchanged. We will continue to assess the timing and strength of both the downward pressures on inflation from a weaker economy and the upward pressures on inflation from higher costs related to tariffs and the reconfiguration of trade. If a weakening economy puts further downward pressure on inflation and the upward price pressures from the trade disruptions are contained, there may be a need for a reduction in the policy interest rate. Governing Council is proceeding carefully, with particular attention to the risks and uncertainties facing the Canadian economy. These include: the extent to which higher US tariffs reduce demand for Canadian exports; how much this spills over into business investment, employment and household spending; how much and how quickly cost increases from tariffs and trade disruptions are passed on to consumer prices; and how inflation expectations evolve. We are 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 September 17, 2025. Read the July 30th., 2025 Monetary Report

Lowering Your Overall Cost of Borrowing

By Carmelo Mamertino • July 23, 2025
If you’re like most Canadians, chances are you don’t have enough money in the bank to buy a property outright. So, you need a mortgage. When you’re ready, it would be a pleasure to help you assess and secure the best mortgage available. But until then, here’s some information on what to consider when selecting the best mortgage to lower your overall cost of borrowing. When getting a mortgage, the property you own is held as collateral and interest is charged on the money you’ve borrowed. Your mortgage will be paid back over a defined period of time, usually 25 years; this is called amortization. Your amortization is then broken into terms that outline the interest cost varying in length from 6 months to 10 years. From there, each mortgage will have a list of features that outline the terms of the mortgage. When assessing the suitability of a mortgage, your number one goal should be to keep your cost of borrowing as low as possible. And contrary to conventional wisdom, this doesn’t always mean choosing the mortgage with the lowest rate. It means thinking through your financial and life situation and choosing the mortgage that best suits your needs. Choosing a mortgage with a low rate is a part of lowering your borrowing costs, but it’s certainly not the only factor. There are many other factors to consider; here are a few of them: How long do you anticipate living in the property? This will help you decide on an appropriate term. Do you plan on moving for work, or do you need the flexibility to move in the future? This could help you decide if portability is important to you. What does the prepayment penalty look like if you have to break your term? This is probably the biggest factor in lowering your overall cost of borrowing. How is the lender’s interest rate differential calculated, what figures do they use? This is very tough to figure out on your own. Get help. What are the prepayment privileges? If you’d like to pay down your mortgage faster. How is the mortgage registered on the title? This could impact your ability to switch to another lender upon renewal without incurring new legal costs, or it could mean increased flexibility down the line. Should you consider a fixed rate, variable rate, HELOC, or a reverse mortgage? There are many different types of mortgages; each has its own pros and cons. What is the size of your downpayment? Coming up with more money down might lower (or eliminate) mortgage insurance premiums, saving you thousands of dollars. So again, while the interest rate is important, it’s certainly not the only consideration when assessing the suitability of a mortgage. Obviously, the conversation is so much more than just the lowest rate. The best advice is to work with an independent mortgage professional who has your best interest in mind and knows exactly how to keep your cost of borrowing as low as possible. You will often find that mortgages with the rock bottom, lowest rates, can have potential hidden costs built in to the mortgage terms that will cost you a lot of money down the road. Sure, a rate that is 0.10% lower could save you a few dollars a month in payments, but if the mortgage is restrictive, breaking the mortgage halfway through the term could cost you thousands or tens of thousands of dollars. Which obviously negates any interest saved in going with a lower rate. It would be a pleasure to walk you through the fine print of mortgage financing to ensure you can secure the best mortgage with the lowest overall cost of borrowing, given your financial and life situation. Please connect anytime!