Online Mortgage Calculators, Can You Trust Them?

Shanna Davis • May 28, 2019

You’d think an online calculator is a pretty straight forward device, one that you should be able to place your full 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 a mortgage professional, you are going to be misinformed. Don’t be fooled, while an online mortgage calculator can help you calculate mortgage payments, or help you assess how additional payments would impact your amortization, they will never be able to give you an exact picture of what you can actually afford and how a lender will consider your mortgage application.

While mortgage calculators are objective, mortgage lending isn’t. It’s 100% subjective. A lender will consider your financial situation, employment, credit history, assets, liabilities, the property you are looking to purchase, and then compare that with whatever risk profile they currently have the appetite to lend to. Simply put, they don’t just look at the numbers.

An online calculator is a great tool to help you to run different financial scenarios and to help you assess your comfort level with different payment schedules and mortgage amounts, but please don’t rely on an online calculator for mortgage qualification purposes, you will be disappointed.

When the time is right, the very first step in the mortgage qualification process is a preapproval. A preapproval will take a look at 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 you aren’t obligated to buy. It will simply allow you the freedom to move ahead with confidence, knowing exactly where you stand. Something a calculator is unable to do.

If you would like to talk more about your financial situation, please contact me anytime! 

 

SHANNA DAVIS

Mortgage Broker

CONTACT ME

RECENT POSTS

What Is a Cashback Mortgage and How Does It Work?

By Shanna Davis • May 21, 2026
Cashback Mortgages: Are They Worth It? Here’s What You Need to Know If you’ve been exploring mortgage options and come across the term cashback mortgage , you might be wondering what exactly it means—and whether it’s a smart move. Let’s break it down in simple terms. What Is a Cashback Mortgage? A cashback mortgage is just like a regular mortgage—but with one extra feature: you receive a lump sum of cash when the mortgage closes . This cash is typically: A fixed amount , or A percentage of the total mortgage , usually between 1% and 7% , depending on your mortgage term and lender. The money is tax-free and paid directly to you on closing day. What Can You Use the Cashback For? There are no restrictions on how you use the funds. Here are some common uses: Covering closing costs Buying new furniture Renovations or home upgrades Paying off high-interest debt Boosting your cashflow during a tight transition Whether it’s to help you settle in or catch up financially, cashback can offer a helpful buffer— but it comes at a cost . The True Cost of a Cashback Mortgage Here’s the part many people overlook: cashback mortgages come with higher interest rates than standard mortgages. Why? Because the lender is essentially advancing you a small loan upfront—and they’re going to make that money back (and then some) through your mortgage payments. So while the upfront cash feels like a bonus, you’ll pay more in interest over time to have that convenience. Breaking Down the Numbers It’s hard to give a blanket answer about how much more you’ll pay since it depends on: Your interest rate The cashback amount The mortgage term Your payment schedule This is why it’s important to run the numbers with a mortgage professional who can help you compare this option with others based on your personal financial situation. Are You Eligible for a Cashback Mortgage? Not everyone qualifies. Cashback mortgages generally come with stricter requirements . Lenders often want to see: Excellent credit history Strong, stable income Low debt-to-income ratio If your mortgage file includes anything “outside the box”—like being self-employed or recently changing jobs—qualifying for a cashback mortgage might be tough. What If You Need to Break the Mortgage? This is one of the biggest risks with cashback mortgages. If your circumstances change and you need to break your mortgage early, you could be on the hook for: Paying back some or all of the cashback you received, and A prepayment penalty (typically the interest rate differential or 3 months’ interest—whichever is higher) That can be a very expensive combination. So if there’s even a chance you might need to sell, refinance, or move before your term is up, a cashback mortgage might not be the best fit. Should You Consider a Cashback Mortgage? Maybe—but only with eyes wide open. Cashback mortgages can be helpful in the right scenario, but they’re not free money. They’re a lending tool that benefits the lender , and the key is knowing exactly what you’re agreeing to. Final Thoughts: Talk to an Expert First Choosing the right mortgage isn’t just about the lowest rate or the biggest perk—it’s about making a choice that fits your whole financial picture. If you’re considering a cashback mortgage, or just want to explore all your options, let’s talk. As an independent mortgage professional , I can help you weigh the pros and cons of various products, so you can make a confident, informed decision. Have questions? I’d be happy to help—reach out anytime.

Mortgage Approval 101: GDS & TDS Explained

By Shanna Davis • May 7, 2026
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.