How Much Mortgage Can I Afford in Canada?

The Two Numbers That Determine Your Mortgage Limit

Canadian lenders use two ratios to determine how much mortgage you can carry: the Gross Debt Service (GDS) ratio and the Total Debt Service (TDS) ratio. Both are calculated using your gross monthly income and the stress test rate — not your actual mortgage rate. You must pass both tests; the lower of the two results is your binding limit.

The GDS ratio looks only at your housing costs — mortgage payment, property taxes, heating, and half of any condo fees. The TDS ratio adds all your other debts on top: car loans, student loans, credit card minimum payments, lines of credit. Most Canadians are limited by their TDS ratio if they carry any consumer debt.

The reason these ratios matter is simple: lenders have learned through decades of mortgage data exactly what level of housing cost relative to income leads to default. The 39% GDS and 44% TDS limits are not arbitrary — they represent the thresholds above which default rates rise sharply. Knowing where you fall before you apply gives you the power to optimize your application.

The GDS Ratio — Your Housing Cost Limit

The Gross Debt Service ratio measures what percentage of your gross monthly income goes toward housing costs. Lenders calculate it as:

The monthly mortgage payment in this calculation is not based on your actual rate — it is calculated at the stress test rate. Lenders typically use $150/month as a standard heating estimate for a detached house, and your most recent property tax bill (or an estimate from the municipality) for taxes. Condo fees are counted at 50% because the other half is considered to cover maintenance that a house owner would pay out-of-pocket anyway.

Worked example: You earn $100,000 gross per year ($8,333/month). The maximum GDS allowance at 39% is $3,250/month in housing costs. Subtract $400/month in estimated property taxes and $150 in heating, and you have $2,700/month available for your mortgage payment at the stress test rate. At 6.89% over 25 years, $2,700/month supports a mortgage of approximately $430,000. Add your down payment on top to determine your maximum purchase price.

One practical implication of the GDS ratio: if you are buying a condo with $700/month in strata fees, the $350 monthly amount counted toward GDS eats significantly into your housing allowance. A $700/month condo fee effectively reduces your maximum mortgage by roughly $55,000 at current stress test rates. This is one of the hidden costs of buying in a building with high fees, and it catches many first-time buyers off guard.

The TDS Ratio — Your Total Debt Limit

The Total Debt Service ratio expands the GDS calculation to include all of your monthly debt obligations. Lenders calculate it as:

The TDS ratio is where consumer debt does the most damage to your mortgage affordability. Consider this: if you have a $500/month car payment, that consumes 6% of your $8,333 gross monthly income. Since the TDS ceiling is 44%, and your housing costs already use 39%, your car payment essentially uses up the entire 5% gap between GDS and TDS — leaving zero room for other debts.

The math of debt elimination: Eliminating a $500/month car loan before applying frees up that TDS room for mortgage. At current stress test rates, each $500/month freed up can support approximately $80,000–$100,000 more in mortgage. For a $50,000 car loan you could pay off, spending $50K of savings to eliminate the car debt and then borrowing $90,000 more on your mortgage is mathematically positive — you are gaining $40,000 in buying power and the mortgage rate is far lower than the implied cost of the car loan impact.

Credit card minimum payments are included in TDS even if you pay your balance in full every month. Lenders use 3% of the outstanding balance as the minimum payment — so a $10,000 credit card limit counts as $300/month against your TDS ratio even with a zero balance. This is why consolidating or reducing credit card limits before applying can also improve your qualifying amount.

The Stress Test Impact on Your Maximum Mortgage

The mortgage stress test requires lenders to qualify you at the higher of your contract rate plus 2%, or 5.25%. At today's best 5-year fixed rate of 4.89%, the qualifying rate is 6.89%. This single rule reduces your buying power by approximately 18–22% compared to qualifying at your actual rate.

To understand the impact concretely: on a $100,000 income with no other debts, qualifying at 4.89% over 25 years would allow a mortgage of approximately $680,000. Qualifying at the 6.89% stress test rate on the same income allows only about $540,000. That $140,000 gap is not money you cannot afford — it is money the government has decided you should not borrow, because rates could rise. Whether you agree with that policy or not, it is the reality every Canadian buyer faces.

The table below shows how the stress test affects your maximum mortgage at different rate scenarios, assuming $100,000 gross household income, no other debts, $100,000 down payment, and 25-year amortization:

Notice that as contract rates rise, the stress test rate rises in tandem — and buying power falls substantially. This is why rate environment matters so much in affordability calculations. Rates that rose from 2% to 5% between 2022 and 2023 did not merely increase monthly payments for new buyers — they reduced the maximum mortgage the average Canadian could qualify for by over 30%. For more details on the stress test mechanism, see our Mortgage Stress Test Guide.

How Much Mortgage Can You Afford? — By Income Level

The table below provides a practical reference for Canadian households at different income levels. These estimates assume: no other debts (TDS equals GDS), 20% down payment, 25-year amortization, stress test rate of 6.89%, $400/month property taxes, and $150/month heating. If you carry any consumer debts, reduce these figures accordingly.

Estimates based on GDS ratio at 6.89% stress test rate, 25-year amortization. Assumes no consumer debts. With a $500/month car loan, reduce maximum mortgage by approximately $80,000–$100,000.

These figures explain why homeownership in Toronto and Vancouver is mathematically out of reach for median-income Canadian households without significant equity or family assistance. A median household income in Toronto is roughly $90,000 — supporting a maximum mortgage of around $468,000 at current stress test rates. With a 20% down payment of $100,000, that produces a maximum purchase price of $568,000. The average Toronto detached home costs over $1.3 million. The gap is not marginal — it is structural.

Down Payment — The Other Variable in Your Affordability

Your maximum purchase price is your maximum qualifying mortgage plus your down payment. This means every extra dollar of down payment directly increases the price you can offer. But the interaction between down payment size and CMHC insurance makes the math more complex than it first appears.

Canada's minimum down payment rules as of 2026: 5% for homes under $500,000; 5% on the first $500,000 plus 10% on the remainder for homes between $500,000 and $999,999; and 20% for homes $1,000,000 and above. CMHC insurance is mandatory when your down payment is below 20%, adding a premium of 2.80–4.00% of your mortgage to your total loan balance. This premium increases your mortgage — meaning your monthly payment, your TDS ratio, and your total interest cost all rise.

The most tax-efficient tools for building your down payment are the First Home Savings Account (FHSA) and the RRSP Home Buyers' Plan (HBP). The FHSA allows $8,000 per year (up to $40,000 lifetime) in contributions that are fully tax-deductible and can be withdrawn tax-free for a qualifying home purchase — combining the best features of both the RRSP and TFSA. The HBP allows you to withdraw up to $35,000 from your RRSP, with a 15-year repayment window. Together, a couple can access up to $150,000 in tax-advantaged funds for a down payment. For a deep dive, see our FHSA Guide.

One nuance worth understanding: every extra dollar of down payment saves you in two ways. First, it reduces your mortgage balance. Second, it reduces or eliminates your CMHC premium. Going from 5% to 10% down on a $600,000 home saves you $5,880 in CMHC premium alone — on top of the reduced mortgage balance and lower interest costs. The break-even calculation almost always favours saving more before buying, unless you expect significant property appreciation in the near term.

The Difference Between Affordability and Approval

Your lender will tell you the maximum mortgage you qualify for. That number is a ceiling, not a recommendation. The GDS and TDS ratios are limits designed to prevent obvious overextension — they do not account for the full reality of your financial life, your career aspirations, your family plans, or your actual after-tax take-home pay.

A useful rule of thumb that financial planners consistently recommend: keep your actual housing costs (mortgage, property taxes, utilities, condo fees, maintenance reserves) under 30% of your take-home pay — not your gross income. The difference is significant. A $100,000 gross income in Ontario produces approximately $72,000 in after-tax income, or $6,000/month. Thirty percent of that is $1,800/month — which supports a much smaller mortgage than the 39% GDS ceiling applied to gross income.

Before you decide how much to spend, calculate your actual monthly cash flow. Take your net monthly income, subtract all fixed expenses, factor in realistic estimates for childcare if applicable, and then see what remains for housing. If you are a dual-income couple, run the calculation on one income alone — what happens if one of you stops working for a year? The home has to be affordable in a worst-case scenario, not just when everything is going well.

The psychological pressure of real estate markets in Canada — particularly the fear of being priced out permanently — leads many buyers to borrow more than is genuinely comfortable. The lender's maximum is not your target. A good broker will help you identify not just the maximum you qualify for, but the amount that supports a balanced financial life.

What Lenders Actually Look At — Beyond the Ratios

GDS and TDS ratios are the framework, but lenders evaluate several other factors that can improve or limit your mortgage options. Understanding all of them lets you approach the application fully prepared.

Frequently Asked Questions