How much house can I afford in Canada? A complete mortgage affordability guide

The most useful answer is usually lower than the number in your mortgage pre-approval.

A lender calculates the largest mortgage it may be willing to give you. It looks at your income before tax, your existing debts, estimated housing costs and whether you could still qualify at a higher interest rate. That tells you whether the loan fits the lender's rules. It doesn't tell you whether the payments would leave enough money for groceries, childcare, travel, retirement savings, repairs or a life outside the house.

So there are really two affordability numbers:

1. Your qualification ceiling: the highest purchase price a lender may approve.
2. Your comfortable price: the amount you can carry without emptying your savings or making the rest of your budget miserable.

Canooq's free mortgage affordability calculator estimates both the home price and the cash needed to close. It applies the Canadian mortgage stress test and lender-style debt limits, then shows the monthly mortgage payment, property costs and effect of your other debts. Use its result as a ceiling to investigate, not a target to hit.

Start with the money that actually enters the calculation

Mortgage affordability starts with gross household income: what you and any co-borrower earn before income tax, Canada Pension Plan contributions, Employment Insurance premiums and other payroll deductions.

If one person earns $75,000 and the other earns $55,000, the application begins with $130,000 of household income. Include both incomes only if both people will be on the mortgage application. A lender will also want proof that the income is real and likely to continue, usually through documents such as pay stubs, employment letters, T4 slips and Notices of Assessment from the Canada Revenue Agency.

Salary is generally easier to use than irregular overtime, bonuses, commissions, self-employment income or a new job still in its probation period. Those earnings aren't necessarily ignored, but a lender may ask for a longer history and use an average rather than the best recent year.

This is also where a rough rule such as “four times your income” starts to fall apart. Two households earning the same amount can qualify for very different mortgages if one has a car loan, the other has no debt, and their prospective homes have different property taxes or condo fees.

How the mortgage stress test reduces what you can borrow

The interest rate in your mortgage contract isn't necessarily the rate used to approve you. Federally regulated lenders must check whether you could carry the loan at the greater of 5.25% or your contract rate plus two percentage points. This higher qualifying rate is commonly called the mortgage stress test. The Office of the Superintendent of Financial Institutions confirms that the same formula remains current for uninsured mortgages, while CMHC applies it to insured qualification.

If your lender offers 4.25%, you must qualify as though the rate were 6.25%. At 5%, the test rate becomes 7%. If the contract rate were 2.75%, the floor would apply and you would qualify at 5.25%, not 4.75%.

The lender isn't actually charging you the stress-test rate. Your payments are based on the rate in your contract. The higher rate is used to calculate a smaller mortgage that your income can support.

That distinction is easier to see with $500,000 borrowed over 25 years. At a 5% contract rate, the monthly payment is roughly $2,908. Tested at 7%, the same mortgage is about $3,502 a month. You need enough income to pass the second calculation even though you initially pay the first amount.

Passing the test doesn't make the mortgage immune to rate increases. A Canadian mortgage may take 25 or 30 years to repay, but its rate is usually locked in for a much shorter term, often five years or less. When that contract ends, the remaining balance must be renewed at whatever rate you can obtain then. The stress test provides some room; it doesn't reserve $700 in your bank account every month on your behalf.

GDS and TDS: the two debt ratios behind the approval

Lenders turn your income and expenses into two percentages. The names sound technical, but the idea is simple: how much of your income would already be committed before you buy anything else?

Gross debt service, or GDS, is the percentage of gross household income needed for the mortgage payment, property tax, heating and 50% of condo or strata fees. CMHC's insured-mortgage limit is 39%.

Total debt service, or TDS, includes those housing costs plus payments on other debts, including car loans, student loans, lines of credit and credit cards. CMHC's limit is 44%. The CMHC debt-service rules explain both calculations and how individual costs are treated.

For a household earning $120,000 a year, gross monthly income is $10,000. A 39% GDS limit allows about $3,900 for the stress-tested mortgage payment, property tax, heat and half the condo fee. A 44% TDS limit allows $4,400 for those costs and other debt combined.

Suppose that household pays $700 a month toward a car and student loan. The TDS calculation leaves $3,700 for qualifying housing costs, so TDS becomes the tighter limit. Paying off that debt can improve affordability more than putting the same cash into the down payment because the monthly obligation disappears from every future calculation.

Credit cards can hurt even when the required payment looks small. For CMHC's calculation, lenders generally factor in at least 3% of an unsecured credit card or line-of-credit balance as a monthly obligation. A $10,000 balance can therefore consume $300 of monthly qualification room.

There is one particularly misleading detail for condo buyers. The lender may count only half of a $600 condo fee when calculating GDS and TDS, but your bank account still loses the full $600. The other half must be restored when you build your personal budget. The same applies to home insurance and maintenance: they are real ownership costs even when they aren't fully represented in the qualification ratio.

Your down payment sets the loan, but it isn't your entire cash requirement

The down payment is the part of the purchase price you pay yourself. Your mortgage finances the rest.

Canada's current minimums depend on the home's price:

On a $700,000 home, the minimum is $45,000: $25,000 on the first $500,000 and $20,000 on the remaining $200,000. These thresholds are set out by the Financial Consumer Agency of Canada.

With less than 20% down, you will normally need mortgage default insurance. You may hear it called CMHC insurance, although CMHC isn't the only insurer. The insurance protects the lender if you stop paying; it doesn't pay your mortgage for you.

The premium is usually added to the mortgage, which means you borrow it and pay interest on it. Under CMHC's current premium schedule, the standard premium is 4% of the loan with a down payment below 10%, 3.1% with 10% to 14.99% down, and 2.8% with 15% to 19.99% down.

Imagine buying for $500,000 with 5% down. You provide $25,000 and need a $475,000 base mortgage. A 4% insurance premium adds $19,000, bringing the financed mortgage to about $494,000. The small down payment got you into the market sooner, but you begin with a loan only $6,000 below the home's purchase price.

Reaching 20% avoids default-insurance premiums and reduces the loan. It can also change the mortgage rates available to you: insured mortgages sometimes receive lower advertised rates because the lender has less risk. Compare the total mortgage cost, not just the rate.

Putting every available dollar down isn't automatically better either. A buyer who closes with 20% down and $600 left in the bank may be in a more fragile position than one who uses a slightly smaller down payment and keeps a proper emergency fund. The exact insurance trade-off matters, but so does having cash when the hot-water tank and transmission fail in the same week.

First-time buyers may be able to build that down payment through a First Home Savings Account, or FHSA, which allows up to $8,000 of contributions a year and $40,000 over a lifetime. Contributions can reduce taxable income, and a qualifying home-purchase withdrawal is tax-free. The federal Home Buyers' Plan can also allow up to $60,000 to be withdrawn from a Registered Retirement Savings Plan, or RRSP, although that amount generally has to be repaid over time. These programs help assemble the cash; they don't make a monthly mortgage affordable by themselves.

Closing costs are cash you need in addition to the down payment

A $70,000 down payment doesn't mean $70,000 is enough to buy. Legal work, title insurance, land transfer or property transfer tax, an inspection, an appraisal and adjustments for expenses the seller prepaid can all become due around closing. Buyers of new construction may also face sales-tax and builder adjustments that deserve a careful review with a lawyer.

The federal consumer agency suggests reserving 1.5% to 4% of the purchase price for upfront closing costs. On a $600,000 home, that is $9,000 to $24,000. The range is wide because land transfer taxes and rebates vary substantially by province and municipality; Toronto, for example, has a municipal land transfer tax on top of Ontario's provincial tax.

Canooq's mortgage affordability calculator asks for your province and municipality so it can estimate these costs and available first-time-buyer rebates. It separates cash needed on closing day from the down payment, which prevents a common mistake: entering every dollar saved as the down payment and discovering later that the lawyer needs money you no longer have.

Keep the deposit in mind as well. When an accepted offer requires a deposit, that money normally becomes part of the down payment at closing rather than an extra cost. But it is needed earlier, often within a short deadline, so it must be accessible rather than locked somewhere you can't withdraw it.

The monthly mortgage payment is only the beginning

Owners pay several bills that renters either don't pay directly or already have bundled into rent. A realistic monthly affordability check should include:

• the mortgage payment at the actual contract rate;
• property tax;
• heating, electricity, water and other utilities;
• the full condo or strata fee;
• home insurance;
• routine maintenance and larger future repairs;
• commuting or vehicle costs created by the location; and
• any services you will now pay for yourself, from snow removal to internet.

Maintenance doesn't arrive as a tidy monthly subscription. A house may cost almost nothing for several months and then need a $12,000 roof. Setting aside a monthly amount turns those irregular costs into something the budget can see. A newer condo may need less work inside the unit, but a special assessment can still produce a bill well beyond the regular strata fee.

This is why comparing rent directly with the mortgage payment gives a distorted answer. A $2,600 mortgage isn't equivalent to $2,600 rent once property tax, insurance, maintenance and transaction costs are added. The owner does build equity by repaying principal, but mortgage interest and the other ownership costs don't come back when the property is sold. Use the rent versus buy calculator if the decision is still open, particularly if you may move again within a few years.

A worked example: what a lender may approve versus what feels comfortable

Consider a couple with:

• $120,000 of combined gross annual income;
• no monthly debt payments;
• $120,000 available for the down payment;
• estimated property tax and heat of $550 a month;
• a 5% mortgage rate and 25-year amortization.

Their GDS limit is $3,900 a month. After $550 for tax and heat, about $3,350 remains for the mortgage payment used in qualification. At the 7% stress-test rate, that supports a mortgage of roughly $478,000. With a 20% down payment, the purchase price lands around $598,000, before a lender considers the rest of the file.

At the actual 5% rate, the $478,000 mortgage payment is about $2,780 a month. Add $550 for tax and heat, perhaps $150 for insurance and $500 for maintenance, and the more realistic ownership cost approaches $4,000 a month before any condo fees.

The couple may qualify. Whether they should spend that much depends on the money left after tax and on everything the lender didn't ask about. Two people with inexpensive hobbies, stable pensions and no plans for children may find the budget workable. The same income can feel tight with daycare, unpaid parental leave, frequent travel, support for relatives or an aggressive retirement-savings goal.

Run this kind of scenario in the calculator, then change one input at a time:

• Add two percentage points to the actual mortgage rate, not only the qualification rate.
• Enter the condo fee from the listing rather than leaving it at zero.
• Try the income of one partner alone for a temporary job-loss or parental-leave scenario.
• Add the car payment you may need in two years.
• Reduce the down payment until closing costs and an emergency fund remain in cash.

A useful affordability result should survive at least one imperfect year. If a modest rate increase, a few months away from work or a major repair immediately creates credit-card debt, the purchase price is doing too much work.

Should you take the full mortgage amount you are approved for?

Usually, no. There is nothing prudent about borrowing the maximum simply because the bank permits it.

The lender's ratios use gross income, but your mortgage is paid from income after tax. They also leave out or understate parts of real life: food, childcare, retirement contributions, travel, subscriptions, the full condo fee and most maintenance. A pre-approval near the 39% or 44% limit can therefore leave a household with surprisingly little flexibility.

Build your own ceiling from the monthly payment backward:

1. Start with normal monthly take-home pay, excluding bonuses or overtime you can't rely on.
2. Subtract your actual spending, including debt payments and annual expenses divided by 12.
3. Keep the retirement and other savings you intend to continue after buying.
4. Add the full cost of ownership, not only the mortgage.
5. Leave a monthly margin for expenses being wrong, because some of them will be.

Then check the cash that remains after closing. It should cover closing costs, moving and immediate purchases without using a line of credit, while leaving an emergency fund appropriate for the household and the property. An older detached house, a single-income family or an uncertain job deserves more room than a household with two secure incomes and few obligations.

Don't count on future raises to repair an unaffordable purchase. A promotion may arrive, but so can property-tax increases, insurance renewals and a new mortgage rate. The home has to work with income you can reasonably document today.

Does a 30-year amortization make the home more affordable?

An amortization is the estimated time required to repay the entire mortgage. A longer amortization lowers the required payment because the balance is spread across more months, but it also keeps the debt around longer and generally increases total interest.

For example, a $540,000 mortgage at 5% costs about $3,141 a month over 25 years and $2,882 over 30 years. The extra five years free roughly $259 a month at the start, but more interest accumulates because the principal falls more slowly.

With less than 20% down, the maximum insured amortization is currently 30 years if you are a first-time buyer or are purchasing a newly built home; otherwise it is generally 25 years. The federal mortgage rules explain the current eligibility. With at least 20% down, the lender sets the maximum it will offer.

A 30-year schedule can be reasonable when preserving monthly flexibility matters more than repaying as quickly as possible, especially if the mortgage has useful prepayment privileges. It becomes risky when the lower payment is used only to stretch into a home that is otherwise beyond the budget.

A pre-approval isn't final approval

A mortgage pre-approval is useful because it gives you a rate hold and a preliminary borrowing range before you shop. It is not a promise to finance any property at that price.

Final approval can still depend on updated income and debt documents, your credit, the source of the down payment, the property's condition and the lender's appraisal. If the lender values a home below your offer, it may base the mortgage on the lower appraisal and require you to cover the difference in cash. Some property types are also harder to finance, including certain micro-condos, leasehold properties, former grow operations and homes with serious defects.

That is the practical reason a financing condition can matter in an offer. Removing it to compete for a property means accepting the risk that the mortgage or appraisal doesn't work as expected. A pre-approval reduces that risk; it doesn't eliminate it.

Questions to answer before deciding “yes, we can afford it”

The calculator gives you the numerical starting point. The purchase is much more convincing when these answers also hold up:

• Will we stay long enough? Buying and later selling involve legal fees, transfer taxes, moving costs and selling costs. A short ownership period gives appreciation less time to overcome them.
• Can the budget survive renewal? Test the remaining mortgage at a higher rate and look at the dollar payment, not just the percentage change.
• Will one income change? Parental leave, school, self-employment or a planned career break can matter more than today's combined salary.
• What does the property itself require? Review the inspection, expected repairs, insurance cost, property tax and, for a condo, the strata documents and reserve fund.
• Are we still saving? If every retirement contribution stops indefinitely so the mortgage can fit, the home is replacing another major goal rather than fitting beside it.
• Do we have cash after the keys arrive? Furniture can wait. A plumbing leak generally can't.
• Would renting the alternative be materially cheaper? Ownership can still be the preferred choice, but “rent is throwing money away” isn't a calculation.

Use the Canooq mortgage affordability calculator once with the home you are considering and once with a price 10% lower. Compare the cash left after closing and the full monthly ownership cost in both cases. If the cheaper version noticeably improves the rest of your life while giving you a home you would still be happy to own, that difference is part of affordability too.

Sources

• Office of the Superintendent of Financial Institutions: Minimum qualifying rate for uninsured mortgages
• Canada Mortgage and Housing Corporation: Calculating GDS and TDS
• Canada Mortgage and Housing Corporation: CMHC Purchase requirements and premiums
• Financial Consumer Agency of Canada: Down payment rules
• Financial Consumer Agency of Canada: Buying a home and closing costs
• Financial Consumer Agency of Canada: Mortgage terms and amortization