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How Much Home Can You Actually Afford in Canada? (GDS, TDS, and the Stress Test Explained)

Understand the GDS and TDS ratios lenders use to determine your maximum mortgage, how the stress test reduces your buying power, and what you can do about it.

How Much Home Can You Actually Afford in Canada?

The number your bank gives you and the number you can comfortably afford are often very different. Canadian lenders use two ratios to cap what you can borrow — and then apply a stress test on top. Here's how the math works.

The Two Qualifying Ratios

Gross Debt Service (GDS) ratio — Your monthly housing costs (principal, interest, property tax, heating, 50% of condo fees) must not exceed 39% of your gross monthly income.

Total Debt Service (TDS) ratio — All debt payments combined (housing costs + car loans, student loans, credit card minimums) must not exceed 44% of your gross monthly income.

Lenders use whichever ratio is more restrictive. If you carry significant non-housing debt, TDS will cap you before GDS does.

The Stress Test

Since January 2018, all federally regulated lenders must qualify you at:

The higher of: your contract rate + 2%, or the OSFI minimum (currently 5.25%)

If you're offered 5.0% and the floor is 5.25%, you qualify at 7.0%. This single rule is the biggest determinant of buying power for most Canadians.

What Actually Moves the Number

  • Down payment — More down payment means a smaller mortgage and lower payment, but also eliminates CMHC insurance on insured deals
  • Income — Both employment and self-employment income count, but lenders apply haircuts to variable income
  • Existing debt — Every $500/month in car payments reduces your maximum mortgage by roughly $75,000–$100,000
  • Amortization — 30-year amortization (conventional only) can increase your buying power vs. 25-year

First-Time Buyer Programs That Affect Affordability

  • FHSA (First Home Savings Account) — Up to $8,000/year, $40,000 lifetime, tax-deductible contributions, tax-free withdrawals for a first home
  • Home Buyers' Plan (HBP) — Withdraw up to $60,000 from your RRSP toward a first home purchase (repay over 15 years)
  • First-Time Home Buyer Land Transfer Tax Rebate — Up to $4,000 in Ontario, up to $8,000 in BC

Try the Calculator

→ Home Affordability Calculator

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