5 Things You Need to Know Before You Co-Sign a Mortgage!

Diane Buchanan • August 16, 2018

So you’re thinking about co-signing for a mortgage? Okay, do you really know what that means do you know what you are getting yourself into? Co-signing isn’t necessarily a bad thing, but there is certainly a lot of misinformation floating around on the subject. Although its nice to be in a position to help someone close to you qualify for a mortgage, It’s not a decision that should be made lightly. Co-signing on a mortgage could have a significant impact on your future.

Here are some things you should consider before co-signing a mortgage application. 

1. Regardless if you’re the principal borrower, co-borrower, or co-signor, If you’re on the mortgage, you’re 100% responsible for the debt of the mortgage and everything that goes along with that. Although the term co-signor makes it sound like you are somehow removed from the actual mortgage, you have all the same legal obligations as everyone else on the mortgage. 

2. If the person who you’re co-signing for is unable to make the payments for any reason, you will be expected to make them on their behalf. By signing the mortgage documents, you assume full responsibility for the payments (even if it’s not you making them). 

3. If payments aren’t being made, there is a chance the lender will take legal action against you. This includes all available collection methods such as obtaining a judgement in court or garnisheeing your wage or bank accounts. Worse case scenario, they could actually go after your property or assets in order to cover their loses. Now, this is highly unlikely, but not out of the realm of possibility. 

4. Once the initial term has been completed, you will not automatically be removed from the mortgage. The person who you co-signed for will have to make a new application for the mortgage in their own name and qualify on their own merit. If they don’t qualify at this time, you will be kept on the mortgage for the next term. 

5. When you co-sign for a mortgage, all of the debt of the co-signed mortgage is counted against you. This means that if you’re looking to buy another property in the future, you will have to include the payments of the co-signed mortgage in your debt service ratios, even though you aren’t the one making the payments. This could significantly impact the amount you can borrow in the future. 

If you have any questions about co-signing on a mortgage, or about the mortgage application process in general, I’d love to discuss it with you. Please don’t hesitate to contact me anytime!

DIANE BUCHANAN
 Mortgage Broker

LET'S TALK

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.