How Much Mortgage Can You Actually Afford?

Before shopping for a home, most Canadians ask the same question:

“How much mortgage can I realistically afford?”

The answer depends on your income, debt levels, credit score, down payment, and federal mortgage rules. Understanding these factors helps you avoid financial stress, qualify for a better rate, and set a realistic purchasing budget.

Below is a step-by-step guide to calculating your true affordability — the same way Canadian lenders do.

🧮 1. Start With Your Income

Lenders base mortgage affordability primarily on your gross household income.

Examples:

• A single buyer earning $75,000/year

• A couple earning $140,000 combined

• Self-employed borrowers averaging income over 2 years

Higher income = higher mortgage qualification.

📊 2. Understand Your Debt Ratios (GDS & TDS)

Canada uses two key debt rules:

Gross Debt Service Ratio (GDS)

Must be 39% or less.
This includes:

• Mortgage payment

• Property taxes

• Heat

• Condo fees (50%)

Total Debt Service Ratio (TDS)

Must be 44% or less.
This includes GDS plus:

• Credit card payments

• Car loans

• Lines of credit

• Student loans

If your TDS is above 44%, lenders reduce your maximum mortgage amount.

🧮 Quick Affordability Example

Couple earning $120,000/year
Monthly income = $10,000

Max allowed housing cost under GDS (39%):
➡ $3,900/month

This $3,900 must cover mortgage payment, taxes, heat, and half condo fees.

From this, lenders reverse-calculate your maximum mortgage size.

🏦 3. Canada’s Mortgage Stress Test

All borrowers must qualify at the higher of:

• The actual mortgage rate + 2%
  or

• The government’s benchmark stress test rate

This reduces your maximum borrowing power by 10–20%.
It ensures you can still afford your home if rates rise.

💳 4. Credit Score Matters

Your credit score affects:

• Your interest rate

• Your maximum mortgage amount

• Which lenders will approve you

General guidelines:

• 680+ → best mortgage options

• 620–679 → fewer lenders, higher rates

• Below 600 → alternative lenders or larger down payment may be needed

Higher credit = higher affordability.

💰 5. Down Payment Rules in Canada

Minimum down payments:

• 5% — first $500,000

• 10% — portion between $500,000–$999,999

• 20% — required at $1M+

Your down payment determines:

• Maximum home price

• Whether you need CMHC insurance

• Affordability

🧾 6. Don’t Forget Closing Costs

Lenders require proof you can cover:

• Land transfer taxes

• Legal fees

• Appraisal fees

• Title insurance

• Property tax adjustments

Budget 1.5%–4% of the purchase price for closing costs.

🔢 7. Other Affordability Factors

Lenders also consider:

• Employment stability

• Child/spousal support

• Property type (condo vs detached)

• Location and property taxes

• Heating type (oil vs gas)

• Condo fees

Each of these influences your final mortgage approval amount.

📈 8. How to Increase Your Mortgage Affordability

If your approval amount is lower than expected, try:
✔ Paying down credit card balances
✔ Increasing your down payment
✔ Extending your amortization to 30 years (20% down required)
✔ Choosing a lower-tax neighbourhood
✔ Adding a co-applicant
✔ Improving your credit score
✔ Reducing other monthly loans

A mortgage broker can often get higher approvals by accessing multiple lenders.

🏡 9. Use a Mortgage Affordability Calculator

To quickly estimate your buying power, use a calculator that includes:

• GDS/TDS ratios

• Stress test rates

• Down payment

• Local property taxes

• Heating costs

This gives the most accurate affordability picture.

🚀 Final Thoughts: Know Your Number Before You Shop

Understanding how much mortgage you can truly afford helps you:

• Shop with confidence

• Avoid financial strain

• Make stronger offers

• Qualify for better rates

• Find the right property in your price range

Knowing your affordability is the first step to becoming a smart homeowner in today’s Canadian market.