Can you Trust Online Mortgage Calculators?

Lori Lalonde • December 12, 2023

You’d think an online calculator is a pretty straightforward device, one that you should be able to place your confidence in, and for the most part, they are. Calculators calculate numbers. The numbers are reliable, but how you interpret those numbers, not so much, especially if the goal is mortgage qualification.


If you rely on the numbers from a “What can I afford” or “Mortgage Qualification” calculator without talking to an independent mortgage professional, you’re going to be misinformed.


Don’t be fooled. Even though an online mortgage calculator can help you calculate mortgage payments or help you assess how additional payments would impact your amortization, they’ll never be able to give you an exact picture of what you can afford and how a lender will consider your mortgage application.


While mortgage calculators are objective, mortgage lending isn’t. It’s 100% subjective. Lenders consider your financial situation, employment, credit history, assets, liabilities, the property you are looking to purchase. Then, they will compare that with whatever internal risk profile they are currently using to assess mortgage lending. Simply put, they don’t just look at the numbers.


An online calculator is a great tool to help you run different financial scenarios and help assess your comfort level with different payment schedules and mortgage amounts. However, if you rely on an online calculator for mortgage qualification purposes, you’ll be disappointed.


The first step in the mortgage qualification process is a preapproval. A preapproval will examine all the variables on your application, assess your financial situation, and provide you with a framework to buy a property based on your unique circumstance.


Securing a preapproval comes at no cost to you and without any obligation to buy. It’ll simply allow you the freedom to move ahead with confidence, knowing exactly where you stand. Something a calculator is unable to do.


Please connect anytime if you’d like to talk more about your financial situation and get a preapproval started. It would be a pleasure to work with you.

Lori LaLonde
By Lori Lalonde December 9, 2025
Fixed vs. Variable Rate Mortgages: Which One Fits Your Life? Whether you’re buying your first home, refinancing your current mortgage, or approaching renewal, one big decision stands in your way: fixed or variable rate? It’s a question many homeowners wrestle with—and the right answer depends on your goals, lifestyle, and risk tolerance. Let’s break down the key differences so you can move forward with confidence. Fixed Rate: Stability & Predictability A fixed-rate mortgage offers one major advantage: peace of mind . Your interest rate stays the same for the entire term—usually five years—regardless of what happens in the broader economy. Pros: Your monthly payment never changes during the term. Ideal if you value budgeting certainty. Shields you from rate increases. Cons: Fixed rates are usually higher than variable rates at the outset. Penalties for breaking your mortgage early can be steep , thanks to something called the Interest Rate Differential (IRD) —a complex and often costly formula used by lenders. In fact, IRD penalties have been known to reach up to 4.5% of your mortgage balance in some cases. That’s a lot to pay if you need to move, refinance, or restructure your mortgage before the end of your term. Variable Rate: Flexibility & Potential Savings With a variable-rate mortgage , your interest rate moves with the market—specifically, it adjusts based on changes to the lender’s prime rate. For example, if your mortgage is set at Prime minus 0.50% and prime is 6.00% , your rate would be 5.50% . If prime increases or decreases, your mortgage rate will change too. Pros: Typically starts out lower than a fixed rate. Penalties are simpler and smaller —usually just three months’ interest (often 2–2.5 mortgage payments). Historically, many Canadians have paid less overall interest with a variable mortgage. Cons: Your payment could increase if rates rise. Not ideal if rate fluctuations keep you up at night. The Penalty Factor: Why It Matters More Than You Think One of the biggest surprises for homeowners is the cost of breaking a mortgage early —something nearly 6 out of 10 Canadians do before their term ends. Fixed Rate = Unpredictable, potentially high penalty (IRD) Variable Rate = Predictable, usually lower penalty (3 months’ interest) Even if you don’t plan to break your mortgage, life happens—career changes, family needs, or new opportunities could shift your path. So, Which One is Best? There’s no one-size-fits-all answer. A fixed rate might be perfect for someone who wants stable budgeting and plans to stay put for years. A variable rate might work better for someone who’s financially flexible and open to market changes—or who may need to exit their mortgage early. Ultimately, the best mortgage is the one that fits your goals and your reality —not just what the bank recommends. Let's Find the Right Fit Choosing between fixed and variable isn’t just about numbers—it’s about understanding your needs, your future plans, and how much financial flexibility you want. Let’s sit down and walk through your options together. I’ll help you make an informed, confident choice—no guesswork required.
By Lori Lalonde December 2, 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: 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.