GDS/TDS Ratios Explained

Erik Sepper • March 13, 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.


ERIK SEPPER 
MORTGAGE AGENT

CONTACT ME

Mortgage Refinance To Consolidate Debt

By Erik Sepper • July 23, 2025
If you’re a homeowner looking to optimize your finances, consider taking advantage of your home’s equity to reposition any existing debts you may have. If you’ve accumulated consumer debt, the payments required to service these debts can make it difficult to manage your daily finances. A consolidation mortgage might be a great option for you! Simply put, debt repositioning or debt consolidation is when you combine your consumer debt with a mortgage secured to your home. To make this happen, you’ll borrow against your home’s equity. This can mean refinancing an existing mortgage, securing a home equity line of credit, or taking out a second mortgage. Each mortgage option has its advantages which are best outlined in discussion with an independent mortgage professional. Some of the types of debts that you can consolidate are: Credit Card Unsecured Line of Credit Car Loan Student Loans Personal or Payday Loans Most unsecured debt carries a high interest rate because the lender doesn't have any collateral to fall back on should you default on the loan. However, as a mortgage is secured to your home, the lender has collateral and can provide you with lower rates and more favourable terms. Debt consolidation makes sense because it allows you to take high-interest unsecured debts and reposition them into a single low payment. So, when considering the best mortgage for you, getting a low rate is important, but it’s not everything. Your goal should be to lower your overall cost of borrowing. A mortgage that allows for flexibility in prepayments helps with this. It’s not uncommon to find a mortgage at a great rate that allows you to increase your payments by 15% per payment, double your payments, or make a lump sum payment of up to 15% annually. As additional payments go directly to the principal repayment of the loan, once you’ve consolidated all your debts into a single payment, it’s smart to take advantage of your prepayment privileges by paying more than just your minimum required mortgage payment, as this will help you become debt-free sooner. While there is a lot to unpack here, if you’d like to discuss what using a mortgage to reposition your debts could look like for you, here’s a simple plan we can follow: First, we’ll assess your existing debt to income ratio. We’ll establish your home’s equity. We’ll consider all your mortgage options. Lastly, we’ll reposition your debts to help optimize your finances. If this sounds like the plan for you, the best place to start is to connect directly. It would be a pleasure to work with you.

Buying a Vacation Home? Here’s What You Need to Know

By Erik Sepper • July 17, 2025
The idea of owning a vacation home—your own cozy escape from everyday life—is a dream many Canadians share. Whether it’s a lakeside cabin, a ski chalet, or a beachside bungalow, a second property can add lifestyle value, rental income, and long-term wealth. But before you jump into vacation home ownership, it’s important to think through the details—both financial and practical. Start With Your 5- and 10-Year Plan Before you get swept away by the perfect view or your dream destination, take a step back and ask yourself: Will you use it enough to justify the cost? Are there other financial goals that take priority right now? What’s the opportunity cost of tying up your money in a second home? Owning a vacation home can be incredibly rewarding, but it should fit comfortably within your long-term financial goals—not compete with them. Financing a Vacation Property: What to Consider If you don’t plan to pay cash, then financing your vacation home will be your next major step. Mortgage rules for second properties are more complex than those for your primary residence, so here’s what to think about: 1. Do You Have Enough for a Down Payment? Depending on the type of property and how you plan to use it, down payment requirements typically range from 5% to 20%+ . Factors like whether the property is winterized, the purchase price, and its location all come into play. 2. Can You Afford the Additional Debt? Lenders will calculate your Gross Debt Service (GDS) and Total Debt Service (TDS) ratios to assess whether you can take on a second mortgage. GDS: Should not exceed 39% of your income TDS: Should not exceed 44% If you’re not sure how to calculate these, that’s where I can help! 3. Is the Property Mortgage-Eligible? Remote or non-winterized properties, or those located outside of Canada, may not qualify for traditional mortgage financing. In these cases, we may need to look at creative lending solutions . 4. Owner-Occupied or Investment Property? Whether you’ll live in the home occasionally, rent it out, or use it strictly as an investment affects what type of financing you’ll need and what your tax implications might be. Location, Location… Logistics Choosing the right vacation property is more than just finding a beautiful setting. Consider: Current and future development in the area Available municipal services (sewer, water, road maintenance) Transportation access – how easy is it to get to your vacation home in all seasons? Resale value and long-term potential Seasonal access or weather challenges What Happens When You’re Not There? Unless you plan to live there full-time, you'll need to consider: Will you rent it out for extra income? Will you hire a property manager or rely on family/friends? What’s required to maintain valid home insurance while it’s vacant? Planning ahead will protect your investment and give you peace of mind while you’re away. Not Sure Where to Start? I’ve Got You Covered. Buying a vacation home is exciting—but it can also be complicated. As a mortgage broker, I can help you: Understand your financial readiness Calculate your GDS/TDS ratios Review down payment and lending requirements Explore creative solutions like second mortgages , reverse mortgages , or alternative lenders Whether you’re just starting to dream or ready to take action, let’s build a plan that gets you one step closer to your ideal getaway. Reach out today—it would be a pleasure to work with you.

Don't Accidentally Buy A Home

By Erik Sepper • July 16, 2025
Buying a property might actually be easier than you think. So, if you have NO desire AT ALL to qualify for a mortgage, here are some great steps you can take to ensure you don’t accidentally buy a property. Fair warning, this article might get a little cheeky. Quit your job. First things first, ditch that job. One of the best ways to make sure you won’t qualify for a mortgage is to be unemployed. Yep, most mortgage lenders aren’t in the practice of lending money to unemployed people! If you already have a preapproval in place and don’t want to go through with financing, no problems. Unexpectedly quit your job mid-application. Because, even if you’re making a lateral move or taking a better job, any change in employment status can negatively impact your approval. Spend All Your Savings. To get a mortgage, you’ll have to bring some money to the table. In Canada, the minimum downpayment required is 5% of the purchase price. Now, if the goal is not to get a mortgage, spending all your money and having absolutely nothing in your account is a surefire way to ensure you won’t qualify for a mortgage. So, if you’ve been looking for a reason to go out and buy a new vehicle, consider this your permission. Collect as Much Debt as Possible. After quitting your job and spending all your savings, you should definitely go out and incur as much debt as possible! The higher the payments, the better. You see, one of the main qualifiers on a mortgage is called your debt-service ratio. This takes into count the amount of money you make compared to the amount of money you owe. So the more debt you have, the less money you’ll have leftover to finance a home. Stop Making Your Debt Payments So let’s say you can’t shake your job, you still have a good amount of money in the bank, and you’ve run out of ways to spend money you don’t have. Don’t panic; you can still absolutely wreck your chances of qualifying for a mortgage! Just don’t pay any of your bills on time or stop making your payments altogether. Why would any lender want to lend you money when you have a track record of not paying back any of the money you’ve already borrowed? Provide Ugly Supporting Documentation. Now, if all else fails, the last chance you have to scuttle your chances of getting a mortgage is to provide the lender with really ugly documents. To support your mortgage application, lenders must complete their due diligence. Here are three ways to make sure the lender won’t be able to verify anything. Firstly, and probably the most straightforward, make sure your name doesn’t appear anywhere on any of your statements. This way, the lender can’t be sure the documents are actually yours or not. Secondly, when providing bank statements to prove downpayment funds, make sure there are multiple cash deposits over $1000 without explaining where the money came from. This will look like money laundering and will throw up all kinds of red flags. And lastly, consider blacking out all your “personal information.” Just use a black Sharpie and make your paperwork look like classified FBI documents. Follow-Through So there you have it, to avoid an accidental home purchase, you should quit your job, spend all your money, borrow as much money as possible, stop making your payments, and make sure the lender can’t prove anything! This will ensure no one will lend you money to buy a property! Now, on the off chance that you’d actually like to qualify for a mortgage, you’ve come to the right place. The suggestion would be to actually keep your job, save for a downpayment, limit the amount of debt you carry, make your payments on time, and provide clear documentation to support your mortgage application! If you'd like to make sure you're on the right track, connect anytime. It would be a pleasure to walk through the mortgage process with you.