Mortgage Approval 101: GDS & TDS Explained

Awdie MacKenzie • December 31, 2025

Can You Afford That Mortgage? Let’s Talk About Debt Service Ratios

One of the biggest factors lenders look at when deciding whether you qualify for a mortgage is something called your debt service ratios. It’s a financial check-up to make sure you can handle the payments—not just for your new home, but for everything else you owe as well.


If you’d rather skip the math and have someone walk through this with you, that’s what I’m here for. But if you like to understand how things work behind the scenes, keep reading. We’re going to break down what these ratios are, how to calculate them, and why they matter when it comes to getting approved.


What Are Debt Service Ratios?

Debt service ratios measure your ability to manage your financial obligations based on your income. There are two key ratios lenders care about:

  1. Gross Debt Service (GDS)
    This looks at the percentage of your income that would go toward housing expenses only.
  2. Total Debt Service (TDS)
    This includes your housing costs plus all other debt payments—car loans, credit cards, student loans, support payments, etc.



How to Calculate GDS and TDS

Let’s break down the formulas.


GDS Formula:

(P + I + T + H + Condo Fees*) ÷ Gross Monthly Income


Where:

P = Principal

I = Interest

T = Property Taxes

H = Heat


Condo fees are usually calculated at 50% of the total amount


TDS Formula:

(GDS + Monthly Debt Payments) ÷ Gross Monthly Income


These ratios tell lenders if your budget is already stretched too thin—or if you’ve got room to safely take on a mortgage.


How High Is Too High?


Most lenders follow maximum thresholds, especially for insured (high-ratio) mortgages.

As of now, those limits are typically:

GDS: Max 39%

TDS: Max 44%


Go above those numbers and your application could be declined, regardless of how confident you feel about your ability to manage the payments.


Real-World Example

Let’s say you’re earning $90,000 a year, or $7,500 a month.

You find a home you love, and the monthly housing costs (mortgage payment, property tax, heat) total $1,700/month.


GDS = $1,700 ÷ $7,500 = 22.7%


You’re well under the 39% cap—so far, so good.


Now factor in your other monthly obligations:

  • Car loan: $300
  • Child support: $500
  • Credit card/line of credit payments: $700
    Total other debt = $1,500/month


Now add that to the $1,700 in housing costs:
TDS = $3,200 ÷ $7,500 = 42.7%


Uh oh. Even though your GDS looks great, your TDS is just over the 42% limit. That could put your mortgage approval at risk—even if you’re paying similar or higher rent now.


What Can You Do?

In cases like this, small adjustments can make a big difference:

  • Consolidate or restructure your debts to lower monthly payments
  • Reallocate part of your down payment to reduce high-interest debt
  • Add a co-applicant to increase qualifying income
  • Wait and build savings or credit strength before applying


This is where working with an experienced mortgage professional pays off. We can look at your entire financial picture and help you make strategic moves to qualify confidently.


Don’t Leave It to Chance

Everyone’s situation is different, and debt service ratios aren’t something you want to guess at. The earlier you start the conversation, the more time you’ll have to improve your numbers and boost your chances of approval.


If you're wondering how much home you can afford—or want help analyzing your own GDS and TDS—let’s connect. I’d be happy to walk through your numbers and help you build a solid mortgage strategy.


Awdie Mackenzie

Mortgage Broker

GET STARTED

Collateral vs. Standard Mortgage: Pros and Cons Explained

By Awdie MacKenzie • February 25, 2026
Mortgage Registration 101: What You Need to Know About Standard vs. Collateral Charges When you’re setting up a mortgage, it’s easy to focus on the rate and monthly payment—but what about how your mortgage is registered? Most borrowers don’t realize this, but there are two common ways your lender can register your mortgage: as a standard charge or a collateral charge . And that choice can affect your flexibility, future borrowing power, and even your ability to switch lenders. Let’s break down what each option means—without the legal jargon. What Is a Standard Charge Mortgage? Think of this as the “traditional” mortgage. With a standard charge, your lender registers exactly what you’ve borrowed on the property title. Nothing more. Nothing hidden. Just the principal amount of your mortgage. Here’s why that matters: When your mortgage term is up, you can usually switch to another lender easily —often without legal fees, as long as your terms stay the same. If you want to borrow more money down the line (for example, for renovations or debt consolidation), you’ll need to requalify and break your current mortgage , which can come with penalties and legal costs. It’s straightforward, transparent, and offers more freedom to shop around at renewal time. What Is a Collateral Charge Mortgage? This is a more flexible—but also more complex—type of mortgage registration. Instead of registering just the amount you borrow, a collateral charge mortgage registers for a higher amount , often up to 100%–125% of your home’s value . Why? To allow you to borrow additional funds in the future without redoing your mortgage. Here’s the upside: If your home’s value goes up or you need access to funds, a collateral charge mortgage may let you re-borrow more easily (if you qualify). It can bundle other credit products—like a line of credit or personal loan—into one master agreement. But there are trade-offs: You can’t switch lenders at renewal without hiring a lawyer and paying legal fees to discharge the mortgage. It may limit your ability to get a second mortgage with another lender because the original lender is registered for a higher amount than you actually owe. Which One Should You Choose? The answer depends on what matters more to you: flexibility in future borrowing , or freedom to shop around for better rates at renewal. Why Talk to a Mortgage Broker? This kind of decision shouldn’t be made by default—or by what a single lender offers. An independent mortgage professional can help you: Understand how your mortgage is registered (most people never ask!) Compare lenders that offer both options Make sure your mortgage aligns with your future goals—not just today’s needs We look at your full financial picture and explain the fine print so you can move forward with confidence—not surprises. Have questions? Let’s talk. Whether you’re renewing, refinancing, or buying for the first time, I’m here to help you make smart, informed choices about your mortgage. No pressure—just answers.

Your Guide to Real Estate Investment in Canada

By Awdie MacKenzie • February 18, 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.