Before you visit your first house, one question deserves an answer: how much will a lender actually agree to lend you? That amount is your borrowing capacity. It decides the price range you can shop in, and it shapes how comfortable your finances will feel once the keys are in your hand.
The good news is that the number is not a mystery. Lenders calculate it in a fairly standard way, and understanding that calculation puts you well ahead when the time comes to apply for a mortgage in Quebec. They weigh three things: what you earn, what you already owe, and what the mortgage would really cost you every month. Here is how it all fits together.
Key takeaways
- Your borrowing capacity is the maximum a lender will agree to lend you. It is a maximum, not a budget.
- Seven things affect it: your income, your debts, your down payment, the interest rate, the amortization period, the lender you choose and your credit file.
- Two ratios do the math: GDS, capped at 39% of your income, and TDS, capped at 44%.
- The stress test checks whether you could still pay if rates went up. You are tested at your rate plus two percentage points, or at 5.25%, whichever is higher.
- Borrowing the full amount you qualify for is rarely wise. The ratios use your income before taxes and leave out plenty of real household expenses.
What is mortgage borrowing capacity?
Your mortgage borrowing capacity is the largest amount a lender will agree to lend you to buy a home, based on where your finances stand today.
Knowing that number early changes everything about the search. You visit homes you can actually finance, you avoid falling for a property that was never within reach, and when the right listing finally appears, you can make an offer the same day instead of scrambling to find out whether you qualify or not.
What affects your borrowing capacity?
Seven things decide how much a lender will put on the table. Some feed the calculation directly, like your income and your debts. Others shape how much confidence the lender has in you. Here is each one.
Your income
Income is the starting point. The higher and steadier it is, the more you can borrow. And if you are buying with someone, both incomes count, which widens your price range considerably.
There is a catch, though. Lenders do not treat every type of income the same way, and that is usually where the unpleasant surprise comes from when the amount offered lands lower than expected.
Which income counts?
What a lender wants is income that is stable, provable and recurring. Here is how each type is handled:
- Salary from a permanent full-time job: counted in full.
- Commissions, bonuses, overtime and tips: averaged over the last two years, like any income without guaranteed hours.
- Retirement income: counted in full, whether it comes from the QPP, Old Age Security or a private plan.
- Parental benefits: counted in full once you confirm the date you return to work.
- Support payments you receive counted in full if you can show the judgment or the agreement.
- Rental income: only partly counted, somewhere between 50% and 100% depending on the type of unit.
Other money almost never makes the list: undeclared income, social assistance, scholarships and one-time amounts.
Beware! If you are self-employed, the calculation can change
When you are self-employed, a lender does not care how much your business brings in. It looks at the personal income you report on your tax return, averaged over two years; that figure tends to move around.
It also tends to sit low, because most self-employed people deduct everything they legitimately can to reduce their taxes. The result is an income on paper that falls well short of what you actually earn, which is why qualifying is generally tougher for this profile.
Your existing debts
Every monthly payment you already carry takes up room the mortgage cannot use. So before deciding how much is left for a mortgage payment, the lender adds up everything you owe each month.
Which leads to a simple lever: clearing a debt with a big monthly payment before you apply frees up capacity almost immediately.
Which debts lower your borrowing capacity?
Here is what a lender counts:
- A car loan or a car lease;
- Personal loans;
- Student loans;
- Credit card balances;
- Lines of credit, whether you use them or not;
- Anything financed through a store, like furniture or appliances;
- Support payments you make.
Everyday expenses are left out of the calculation, even though groceries, insurance and childcare weigh heavily on a family budget.
Your down payment
Your down payment is the money you put in yourself. The mortgage covers the rest. Together, the two add up to the price of the home.
So the more you save, the more house you can buy. If a lender approves you for $300,000 and you have $60,000 set aside, you are shopping up to $360,000. Save $80,000 instead and you are shopping up to $380,000, with the exact same mortgage.
The mortgage loan insurance
There is a second reason to keep saving. If your down payment comes in under 20% of the price, mortgage loan insurance becomes mandatory. It protects the lender in case you stop paying, you cannot opt out of it, and its cost gets added to your mortgage.
Your monthly payment climbs as a result. And the higher your monthly payment, the less a lender is willing to lend you. Reaching 20% removes that cost entirely. which helps you borrow more.
The interest rate
The interest rate decides how much of each payment covers interest and how much actually pays down what you borrowed. The higher the rate, the bigger the payment on the same loan, and the less you can borrow. It is also the one factor you have almost no control over.
The amortization period
The amortization period is how many years you have to pay the loan off in full, usually 25 or 30 depending on your file. Stretch it out and your monthly payment drops, which means you can borrow more.
The trade-off is real, though. A longer amortization does not make the home cheaper. It spreads the cost over more years, and the total interest you pay climbs noticeably along the way.
The lender you choose
The two ratios are the same everywhere, and so are their limits. What changes from one lender to the next is what goes into them.
One institution counts 80% of your rental income, another only half. One takes your commissions at full value, another averages them over two years. Some are stricter about the minimum credit score, or about how they treat a line of credit you never touch. Nothing dramatic on its own, but put together, the same file can come back with a different answer depending on where it lands.
Your overall financial profile
Beyond the numbers, a lender is reading how reliable you look on paper. Your credit score, your payment history, how much of your available credit you are using, how long your accounts have been open: it all counts.
A solid credit file does more than get you approved. It brings your rate down, and a lower rate means a bigger mortgage.
Debt service ratios: how the calculation works
All of these factors eventually become numbers. Lenders funnel them into two ratios, and those two debt ratios decide what you are approved for. The method barely changes from one institution to another. Let’s see how it works.
1. Gross debt service ratio (GDS)
The GDS ratio measures how much of your income goes to housing alone. It covers your mortgage payment, municipal and school taxes, heating costs and, if you are buying a condo, half of the condo fees. Most lenders want to see 39% or less.
2. Total debt service ratio (TDS)
The TDS ratio casts a wider net. On top of your housing costs, it adds car payments, credit cards, lines of credit, student loans and any support payments you make. Here the line is usually drawn at 44% of your gross income.
The stress test: the rate behind the calculation
Before approving anything, a lender wants proof that you could keep paying if rates went up. So it runs both ratios at a rate higher than the one you will actually pay. That exercise is the stress test.
The rate used, called the qualifying rate, is the higher of two numbers: your rate plus two percentage points, or 5.25%.
Say you are offered 4.25%. You will be tested at 6.25%, even though 4.25% is what appears on your statement every month. The lender simply wants to know you would still be able to afford the house if rates were to be higher at renewal.
Why work with a mortgage broker?
Here is where things get interesting. The rules are the same everywhere, but no two lenders apply them the same way. Go directly to your bank and you will only ever see what that bank sells. A mortgage broker works the other way around. Instead of one lender, they have access to many, and they compare each of them for you.
There is a second advantage, and it is the one people underestimate. A broker builds your file before sending it anywhere. The right documents, the right explanations, your income presented the way each lender wants to see it. A file that arrives well prepared, at the lender most likely to say yes, simply gets a better answer.
Best of all, it’s free for you. The lender pays the broker once your financing goes through.
Mortgage pre-approval: putting your number on paper
Once you have an estimate, the next step is making it official. A mortgage pre-approval is written confirmation from a lender of the maximum it is prepared to lend you. It comes with a bonus. Your rate is held for a set period, usually 60 to 120 days, so a rate hike halfway through your search cannot catch you off guard.
One caveat is worth repeating, though: a pre-approval is not a guarantee of financing. The real application happens once you have found the home, and it still depends on your situation staying where it was.
What if your application is refused?
A refusal is not the end of the story. It means one lender, following its own rules, cannot finance your file as it stands. Your first move is to find out exactly why: a ratio over the limit, a credit score that fell short, income the lender would not count, or a down payment that was poorly documented.
Each of those has its own fix, and many can be sorted out in a matter of weeks. Once you know the reason, you can start working on the things that raise your borrowing capacity.
How to raise your borrowing capacity
Your borrowing capacity is not carved in stone. Whether you have been turned down or you are still preparing your application, a few moves can improve it:
- Pay off a debt with a high monthly payment;
- Lower the limit on a line of credit you never use, or close it;
- Put more money down;
- Improve your credit score;
- Combine several debts into one smaller monthly payment;
- Wait until you have two full years of income in a new job situation.
Should you borrow the maximum?
Once you know your maximum, it’s tempting to look for a home priced at exactly that amount. That’s rarely a good idea. The maximum a lender approves is the top of what the ratios allow, not what your budget can carry month after month.
Those ratios run on your income before taxes, and they quietly ignore a long list of real expenses: groceries, childcare, getting around and maintaining the property. Choose a home slightly below your ceiling and you buy yourself breathing room. Less pressure every month and something left over when the unexpected shows up.
Want to know how much you can borrow for a mortgage?
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