House listings make the monthly payment look simple. Your lender sees a wider picture: your income, existing debts, deposit, credit history, property costs and whether you could still afford payments if rates rise. If you are typing “how much can I borrow mortgage” into a search box, the useful answer is not one headline number. It is a borrowing range that fits both lender rules and your real-life.

For buyers across the GTHA, that distinction matters. A maximum approval can help you compete for a property, but a comfortable mortgage leaves room for groceries, childcare, repairs, savings and the plans that matter to your household.

How much can I borrow for a mortgage?

Canadian lenders commonly begin with two affordability calculations: your gross debt service ratio, known as GDS, and your total debt service ratio, or TDS. They compare your household’s regular housing costs and debt payments against gross monthly income.

GDS looks at mortgage principal and interest, property taxes, heating costs and, where relevant, half of condominium fees. TDS includes those costs plus other ongoing debts, such as car loans, lines of credit, credit card minimums, student loans and child support obligations.

Many conventional lending situations work around a GDS of 39% and a TDS of 44%, though these are guidelines rather than promises. The lender, loan type, credit strength, deposit size and property can all affect what is acceptable. A strong application may have more flexibility; a file with higher debt or weaker credit may have less.

That is why online calculators are a useful starting point, not a final approval. They may show a figure based on income alone while missing a monthly vehicle payment, a condo fee, or the effect of the mortgage stress test.

A simple illustration

Imagine a household earns $120,000 a year before tax. That is $10,000 a month in gross income. At a 39% GDS guideline, about $3,900 could be available for qualifying housing costs. At a 44% TDS guideline, total housing and debt payments might need to stay near $4,400.

If that household has $500 a month in car and credit obligations, the remaining room under TDS is roughly $3,900. From there, property taxes, heating and any condo fees reduce the amount available for the qualifying mortgage payment. The purchase price this supports depends on the interest rate used for qualification, the amortisation period and the size of the deposit.

This example is deliberately broad. It shows why two buyers with the same salary can receive very different answers.

The stress test changes the number

Most borrowers must qualify at a higher rate than the rate on their mortgage contract. This is commonly called the mortgage stress test. Lenders generally use the greater of the contract rate plus 2%, or the qualifying rate set under Canadian rules.

You may be offered a rate that creates a manageable actual payment, yet be assessed at a higher payment for approval purposes. The point is to test whether your finances could handle higher borrowing costs at renewal or if rates change.

For example, a borrower may receive a mortgage rate in the mid-4% range but need to qualify closer to the mid-6% range. The difference can noticeably reduce the maximum mortgage amount, especially when property taxes or other debts are already taking up room in the ratios.

The practical takeaway is simple: do not set your home search budget from an advertised rate alone. Ask what payment will be used to qualify you and what payment you will actually make at the start of the term.

Your deposit matters, but not in only one way

A larger deposit reduces the mortgage you need and can improve your borrowing position. In Canada, the minimum deposit is usually 5% for the first $500,000 of a home’s purchase price, with 10% required on the portion above $500,000 up to $1.5 million. Homes priced at $1.5 million or more generally require at least 20% down.

With less than 20% down, mortgage default insurance is normally required. The premium is often added to the mortgage, which increases the amount borrowed. Insured mortgages can sometimes offer competitive rates, but the deposit still affects affordability and the total cost of borrowing.

Keep separate funds for closing costs. Legal fees, appraisal costs, land transfer tax, moving expenses and adjustments can arrive quickly after an offer is accepted. Using every available pound or dollar for the deposit can leave a new owner under unnecessary pressure. A sensible budget accounts for the purchase and the first few months of ownership.

Debts can reduce borrowing more than expected

A high income is helpful, but regular debt payments can lower the mortgage amount you qualify for. Lenders look at the required monthly payment, not only the remaining balance. A $25,000 car loan with a substantial monthly payment may affect affordability more than a larger balance with a low required payment.

Before applying, it can be worthwhile to review credit cards, lines of credit, vehicle financing and co-signed loans. Paying down a balance, reducing a limit where appropriate, or clearing a short-term obligation can change the numbers. Do not close longstanding credit accounts or make large financial moves without checking how it may affect your credit profile and application.

Avoid taking on new financing while buying a home. A new car lease, furniture plan or credit application shortly before closing can alter your debt ratios and create questions for the lender.

Credit history and employment tell the rest of the story

Credit does not usually set your mortgage amount by itself, but it can influence the lender options, rate and conditions available to you. Lenders want to see that credit has been managed responsibly, payments are made on time and borrowed money is not consistently at its limit.

Employment income is generally straightforward when you have a stable salary or hourly role with a reliable history. Overtime, bonuses and commissions may be usable, but lenders often want a track record. If you are self-employed, the answer can be more nuanced. Declared income, business history, retained earnings, expenses and the type of property all matter.

This is where a one-size-fits-all calculator is least helpful. A self-employed buyer may have a healthy business and strong cash flow but show lower taxable income after legitimate expenses. The right lender and documentation can make a meaningful difference.

Set a comfortable number, not only a maximum number

The lender’s maximum answers what may be approved. Your own budget should answer what you want to carry every month. Start with the likely mortgage payment, then add property tax, utilities, insurance, maintenance and condo fees if applicable. Include annual costs too, such as repairs, vehicle expenses, holidays, savings and professional fees.

A detached home may have no condo fee but can need a roof repair, furnace replacement or landscaping work. A condominium can have more predictable maintenance, yet fees may rise. A lower purchase price in one area may also mean longer commuting costs. There is no universally better choice – only the one that fits your finances and priorities.

A good test is to run the budget at a slightly higher future payment. If a renewal at a higher rate would make the household uncomfortably tight, borrowing less may offer more freedom than stretching to the lender’s limit.

What to prepare before asking for an approval

A quick, accurate mortgage review starts with clear information. Gather recent proof of income, employment details, identification, a summary of your deposit and recent account statements where needed. Have a list of monthly debts and property details if you have already started viewing homes.

Be open about anything that may need explaining, such as a recent job change, commission income, divorce, a credit issue or a self-employed business structure. These situations do not automatically prevent approval. They simply need the right approach from the beginning, rather than a surprise late in the process.

A mortgage broker can compare your circumstances with lender requirements and explain the trade-offs in plain language. EasyApproval.ca takes that personal approach because the right mortgage is more than a rate or a maximum figure. It should suit the way you earn, spend and plan for the future.

The most useful answer to how much you can borrow is one that lets you make an offer with confidence, then still enjoy living in the home after the keys are in your hand.