How Much Difference Will Extra Payments Make Towards My Mortgage?

Diane Buchanan • July 25, 2019

Have you ever wondered how much difference extra payments actually make in paying down your mortgage? Let’s take a look and maybe do a little math.

The first (and largest) factor to look at is the amortization, which is the remainder of your mortgage’s life. A majority of mortgages today start with 25-year amortizations. If you have made only regular payments for 5 years on a 25-year mortgage, your remaining amortization will be 20 years. Pretty simple, right?

Someone making an extra payment on a mortgage with 20 years left will save WAY more interest than someone making the same payment on a mortgage with 5 years left. The more years remaining on a mortgage, the more impact your extra payment will make.

The second factor to keep in mind is the mortgage interest rate. Your interest rate will change many times over the life of your mortgage, divided up by mortgage terms. If you agree to a 5-year term, you will only have that interest rate for 5 years, and then it will be time to renew at a different interest rate. At the time of this writing, mortgage rates are exceptionally low (even after some recent increases in 2018), and based on the last rate decision from the Bank of Canada on April 24/2019, they do not appear to be increasing anytime in 2019.

So what does that mean for you? Well, it depends if you are renewing this year, or 3 years from now. If you are renewing this year, you may want to consider your investment options for a lump sum amount, as opposed to paying down your mortgage. Paying down your mortgage makes the most sense when your amortization is high, and interest rates are also high (or going higher). If you’re renewing in three years time, then you may still want to consider paying down your mortgage, especially if you think mortgage rates will be higher at your renewal. The more you can pay when your mortgage is below 4%, the better payoff it will be if rates increase above 5%.

This is all conjecture and guesswork, especially when deciding between paying down your mortgage or investing more. However, mortgage rates have been abnormally low for a while now, and for whatever reason, the government of Canada selected a benchmark rate above 5% to qualify for a mortgage. Where interest rates go is anyone’s best guess, but it’s nice to be ahead of the game on your mortgage than trying to play catch-up with higher interest rates.

So let’s talk dollar amounts. For all of my examples, I’m going to use a $250,000 mortgage at 3.49% with 20 years remaining – that works out to a payment of $1445.40. If you switch to an accelerated bi-weekly, you’ll pay $722.70 every two weeks (half of the monthly amount), but you’ll save over $12,000 over the next 20 years because you will be making a couple of extra payments per year. Those payments really add up.

With the same mortgage (back on the regular monthly payment), let’s say you have $10,000 floating around your accounts, and you decide to use that money to pay down your mortgage. You’ll have saved around $9,500 in interest thanks to that payment. If you did BOTH the accelerated bi-weekly schedule and the $10,000 payment, it combines to over $20,000 of saved interest.

One more calculation with this mortgage – let’s say that, instead of any of the options described here, you decide to increase the monthly payment from $1445.40 to $1600 even. In just the 5 years time, you would save almost $6000 in interest over the life of the entire mortgage. But if mortgage rates stayed the same for the entire life of the mortgage, and you kept up the additional payment of only $154.60/month, you would pay off the mortgage 3.5 years sooner, AND save almost $15,000 in interest.

In summary, paying down your mortgage can feel good, both in your mind and in your wallet. It makes the most sense to pay down your mortgage when both amortization and interest rates are high. It can sometimes be difficult choosing between investing more and paying down your mortgage, but you can think of your mortgage interest rate as a guaranteed return, which is typically better than your GIC options.

If you’d like to discuss your financial situation and and want to review your mortgage to make sure you have the best mortgage available, contact me anytime!

DIANE BUCHANAN
 Mortgage Broker

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Mortgage Approval 101: GDS & TDS Explained

By Diane Buchanan • October 22, 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.

How Payment Frequency Impacts Mortgage Financing

By Diane Buchanan • October 15, 2025
You’ve most likely heard that there are two certainties in life; death and taxes. Well, as it relates to your mortgage, the single certainty is that you will pay back what you borrow, plus interest. With that said, the frequency of how often you make payments to the lender is somewhat up to you! The following looks at the different types of payment frequencies and how they impact your mortgage. Here are the six payment frequency types Monthly payments – 12 payments per year Semi-Monthly payments – 24 payments per year Bi-weekly payments – 26 payments per year Weekly payments – 52 payments per year Accelerated bi-weekly payments – 26 payments per year Accelerated weekly payments – 52 payments per year Options one through four are straightforward and designed to match your payment frequency with your employer. So if you get paid monthly, it makes sense to arrange your mortgage payments to come out a few days after payday. If you get paid every second Friday, it might make sense to have your mortgage payments match your payday. However, options five and six have that word accelerated before the payment frequency. Accelerated bi-weekly and accelerated weekly payments accelerate how fast you pay down your mortgage. Choosing the accelerated option allows you to lower your overall cost of borrowing on autopilot. Here’s how it works. With the accelerated bi-weekly payment frequency, you make 26 payments in the year. Instead of dividing the total annual payment by 26 payments, you divide the total yearly payment by 24 payments as if you set the payments as semi-monthly. Then you make 26 payments on the bi-weekly frequency at the higher amount. So let’s use a $1000 payment as the example: Monthly payments formula: $1000/1 with 12 payments per year. A payment of $1000 is made once per month for a total of $12,000 paid per year. Semi-monthly formula: $1000/2 with 24 payments per year. A payment of $500 is paid twice per month for a total of $12,000 paid per year. Bi-weekly formula: $1000 x 12 / 26 with 26 payments per year. A payment of $461.54 is made every second week for a total of $12,000 paid per year. Accelerated bi-weekly formula: $1000/2 with 26 payments per year. A payment of $500 is made every second week for a total of $13,000 paid per year. You see, by making the accelerated bi-weekly payments, it’s like you end up making two extra payments each year. By making a higher payment amount, you reduce your mortgage principal, which saves interest on the entire life of your mortgage. The payments for accelerated weekly payments work the same way. It’s just that you’d be making 52 payments a year instead of 26. By choosing an accelerated option for your payment frequency, you lower the overall cost of borrowing by making small extra payments as part of your regular payment schedule. Now, exactly how much you’ll save over the life of your mortgage is hard to nail down. Calculations are hard to do because of the many variables; mortgages come with different amortization periods and terms with varying interest rates along the way. However, an accelerated bi-weekly payment schedule could reduce your amortization by up to three years if maintained throughout the life of your mortgage. If you’d like to look at some of the numbers as they relate to you and your mortgage, please don’t hesitate to connect anytime; it would be a pleasure to work with you.