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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How to Finance a Spousal Buyout After Separation or Divorce

By Josh Perez • August 19, 2026
Mortgage Options During Divorce or Separation: What You Should Know If you’re going through—or considering—a divorce or separation, you may not realize that there are mortgage solutions specifically designed to help one party keep the home . For many people, the family home is their largest asset and where most of their equity is tied up. In situations like this, a spousal buyout program can allow one person to refinance the property and buy out the other party’s share—often up to 95% of the home’s value . This option can work whether you want to keep the home or your former partner does. What Is the Spousal Buyout Program? The spousal buyout program is a refinancing option that allows one owner to purchase the other owner’s share of the property as part of a separation or divorce settlement. In some cases, it can also be used to pay off jointly held debts, as outlined in a legal agreement. Below are some of the most common questions about how the program works. Is a finalized separation agreement required? Yes. Lenders require a signed and finalized separation agreement that clearly outlines how assets and debts are to be divided. This document is essential for approval. Can the funds be used for renovations or personal debts? No. Funds from a spousal buyout can only be used to: Buy out the other owner’s share of equity Pay off joint debts specifically listed in the separation agreement They cannot be used for renovations, personal loans, or unrelated expenses. How much equity can be accessed? The maximum amount available is the amount required to: Buy out the other party’s agreed-upon share of equity Pay off any joint debts listed in the agreement This amount cannot exceed 95% loan-to-value . What is the maximum loan-to-value allowed? The maximum loan-to-value is the lesser of : 95%, or The remaining mortgage balance plus the required buyout and joint debt payout The property must be the primary owner-occupied residence . Do all parties need to be on title? Yes. All individuals involved in the buyout must currently be registered on title. Your solicitor will confirm this through a title search. Does this only apply to married or common-law couples? No. While commonly used for married or common-law couples, the program may also apply to siblings or friends who jointly own a property and need one party to exit the mortgage. These cases are typically reviewed on an exception basis and require insurer approval. If no separation agreement exists, the purchase contract must clearly outline the buyout terms. Is a full appraisal required? Yes. A physical, on-site appraisal is required to confirm the property’s value before the mortgage can be finalized. Final Thoughts This overview covers some of the most common questions about mortgage options during separation or divorce, but every situation is different. Working with an independent mortgage professional gives you access to multiple lenders, specialized programs, and unbiased advice—so you can clearly understand your options and choose what’s best for your future. If you’re navigating a separation and need guidance around keeping or selling the home, feel free to connect anytime. All conversations are handled with discretion and confidentiality, and I’d be happy to walk you through your options.

How to Legally Assign a Construction Mortgage

By Josh Perez • August 12, 2026
Why More Mortgage Options Matter—Especially for Assignment Purchases One of the biggest advantages of working with an independent mortgage professional is access to choice. Instead of being limited to one lender and one set of products, mortgage brokers work with multiple lenders—each with different guidelines, risk tolerances, and mortgage solutions. That flexibility becomes especially valuable when your situation doesn’t fit neatly into a “standard” box. A great example of this is purchasing new construction through an assignment contract . Why Assignment Purchases Can Be Challenging Assignment purchases are often viewed as higher risk by traditional lenders. Rather than declining these deals outright, many lenders quietly make them difficult by adding layers of conditions, restrictions, or uncertainty. This can lead to delays, frustration, or financing falling apart late in the process. The Good News There are lenders—available exclusively through the broker channel —that have clear, favourable policies for assignment purchases. With the right lender and proper planning, these transactions are absolutely doable. Typical Financing Requirements for Assignment Purchases While every situation is unique, many lenders that allow assignment financing look for the following: Standard purchase qualification, including income verification, credit, and down payment Assignments accepted at either the original purchase price or current market value Minimum 620 credit score , with no prior bankruptcies or consumer proposals The full down payment must come from the purchaser —seller incentives cannot be used Required Documentation To secure financing, lenders typically require: The original purchase agreement signed by all parties The MLS listing (if applicable) The assignment agreement signed by the builder, original purchaser, and new buyer Any side agreements outlining changes to the purchase price A full appraisal to confirm value This list isn’t exhaustive, but it highlights that while assignment purchases require more coordination, they are very achievable with the right lender and guidance. Final Thoughts Assignment contracts can open doors to great opportunities—but only if your financing supports the transaction. This is where access to multiple lenders and specialized policies makes a real difference. If you’re considering purchasing new construction through an assignment, or if you’d like to explore more traditional purchase options, feel free to connect anytime. I’d be happy to walk you through the mortgage products available and help you choose an option that doesn’t limit your financing possibilities.