GDS/TDS Ratios Explained

Kambi Heywood • November 9, 2023


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 through CMHC is required, the maximum GDS is 35% with a maximum TDS of 42%. Those ratios are stretched a little when default insurance is secured through Sagan (formerly Genworth) or Canada Guarantee to 39% GDS and 44% TDS.


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.


Rima Amaechi

Licensed Mortgage Broker

GET STARTED

Your Guide to Real Estate Investment in Canada

By Rima Amaechi • April 16, 2026
Your Guide to Real Estate Investment in Canada Real estate has long been one of the most popular ways Canadians build wealth. Whether you’re purchasing your first rental property or expanding an existing portfolio, understanding how real estate investment works in Canada—and how it’s financed—is key to making smart decisions. This guide walks through the fundamentals you need to know before getting started. Why Canadians Invest in Real Estate Real estate offers several potential benefits as an investment: Long-term appreciation of property value Rental income that can support cash flow Leverage , allowing you to invest using borrowed funds Tangible asset with intrinsic value Portfolio diversification beyond stocks and bonds When structured properly, real estate can support both income and long-term net worth growth. Types of Real Estate Investments Investors typically focus on one or more of the following: Long-term residential rentals Short-term or vacation rentals (subject to local regulations) Multi-unit residential properties Pre-construction or assignment purchases Value-add properties that require renovations Each type comes with different financing rules, risks, and return profiles. Down Payment Requirements for Investment Properties In Canada, investment properties generally require higher down payments than owner-occupied homes. Typical minimums include: 20% down payment for most rental properties Higher down payments may be required depending on: Number of units Property type Borrower profile Lender guidelines Down payment source, income stability, and credit history all play a role in approval. How Rental Income Is Used to Qualify Lenders don’t always count 100% of rental income. Depending on the lender and mortgage product, they may: Use a rental income offset , or Include a percentage of rental income toward qualification Understanding how income is treated can significantly impact borrowing power. Financing Options for Investors Investment financing can include: Conventional mortgages Insured or insurable options (in limited scenarios) Alternative or broker-only lenders Refinancing equity from existing properties Purchase plus improvements for value-add projects Access to multiple lenders is often crucial for investors as portfolios grow. Key Costs Investors Should Plan For Beyond the purchase price, investors should budget for: Property taxes Insurance Maintenance and repairs Vacancy periods Property management fees (if applicable) Legal and closing costs A realistic cash-flow analysis is essential before buying. Risk Considerations Like any investment, real estate carries risk. Key factors to consider include: Interest rate changes Market fluctuations Tenant turnover Regulatory changes Liquidity (real estate is not easily sold quickly) A strong financing structure can help manage many of these risks. The Role of a Mortgage Professional Investment mortgages are rarely “one-size-fits-all.” Lender policies vary widely, especially as you acquire more properties. Working with an independent mortgage professional allows you to: Compare multiple lender strategies Structure financing for long-term growth Preserve flexibility as your portfolio evolves Avoid costly mistakes early on Final Thoughts Real estate investment in Canada can be a powerful wealth-building tool when approached with a clear strategy and proper financing. Whether you’re exploring your first rental property or planning your next acquisition, understanding the numbers—and the lending landscape—matters. If you’d like to discuss investment property financing, run the numbers, or explore your options, feel free to connect. A well-planned mortgage strategy can make all the difference in long-term success.

How to Access Your Home Equity Wisely

By Rima Amaechi • April 2, 2026
Need to Free Up Some Cash? Your Home Equity Could Help If you've owned your home for a while, chances are it’s gone up in value. That increase—paired with what you’ve already paid down—is called home equity, and it’s one of the biggest financial advantages of owning property. Still, many Canadians don’t realize they can tap into that equity to improve their financial flexibility, fund major expenses, or support life goals—all without selling their home. Let’s break down what home equity is and how you might be able to use it to your advantage. First, What Is Home Equity? Home equity is the difference between what your home is worth and what you still owe on it. Example: If your home is valued at $700,000 and you owe $200,000 on your mortgage, you have $500,000 in equity . That’s real financial power—and depending on your situation, there are a few smart ways to access it. Option 1: Refinance Your Mortgage A traditional mortgage refinance is one of the most common ways to tap into your home’s equity. If you qualify, you can borrow up to 80% of your home’s appraised value , minus what you still owe. Example: Your home is worth $600,000 You owe $350,000 You can refinance up to $480,000 (80% of $600K) That gives you access to $130,000 in equity You’ll pay off your existing mortgage and take the difference as a lump sum, which you can use however you choose—renovations, investments, debt consolidation, or even a well-earned vacation. Even if your mortgage is fully paid off, you can still refinance and borrow against your home’s value. Option 2: Consider a Reverse Mortgage (Ages 55+) If you're 55 or older, a reverse mortgage could be a flexible way to access tax-free cash from your home—without needing to make monthly payments. You keep full ownership of your home, and the loan only becomes repayable when you sell, move out, or pass away. While you won’t be able to borrow as much as a conventional refinance (the exact amount depends on your age and property value), this option offers freedom and peace of mind—especially for retirees who are equity-rich but cash-flow tight. Reverse mortgage rates are typically a bit higher than traditional mortgages, but you won’t need to pass income or credit checks to qualify. Option 3: Open a Home Equity Line of Credit (HELOC) Think of a HELOC as a reusable credit line backed by your home. You get approved for a set amount, and only pay interest on what you actually use. Need $10,000 for a new roof? Use the line. Don’t need anything for six months? No payments required. HELOCs offer flexibility and low interest rates compared to personal loans or credit cards. But they can be harder to qualify for and typically require strong credit, stable income, and a solid debt ratio. Option 4: Get a Second Mortgage Let’s say you’re mid-term on your current mortgage and breaking it would mean hefty penalties. A second mortgage could be a temporary solution. It allows you to borrow a lump sum against your home’s equity, without touching your existing mortgage. Second mortgages usually come with higher interest rates and shorter terms, so they’re best suited for short-term needs like bridging a gap, paying off urgent debt, or funding a one-time project. So, What’s Right for You? There’s no one-size-fits-all solution. The right option depends on your financial goals, your current mortgage, your credit, and how much equity you have available. We’re here to walk you through your choices and help you find a strategy that works best for your situation. Ready to explore your options? Let’s talk about how your home’s equity could be working harder for you. No pressure, no obligation—just solid advice.