Home Affordability Calculator 2026: How Much House Can You Really Afford?

Getting pre-approved for $600,000 doesn't mean you should spend $600,000. I learned this the hard way when I bought my first condo. I maxed out my budget and spent the next three years eating ramen and skipping vacations.

Let's figure out how much house you can actually afford—not just what the bank will lend you.

The Bank's Formula vs. Reality

Banks use two key ratios to determine how much they'll lend you:

Gross Debt Service (GDS) Ratio

Maximum: 39% of gross income

GDS includes:

• Mortgage principal and interest
• Property taxes
• Heating costs
• 50% of condo fees (if applicable)

Example:

• Gross monthly income: $6,000
• Maximum GDS: $6,000 × 39% = $2,340

This $2,340 must cover your mortgage payment, property taxes, heating, and half your condo fees.

Total Debt Service (TDS) Ratio

Maximum: 44% of gross income

TDS includes everything in GDS plus:

• Car loans
• Credit card payments
• Student loans
• Personal loans
• Other debt obligations

Example:

• Gross monthly income: $6,000
• Maximum TDS: $6,000 × 44% = $2,640
• Existing debts: $500/month
• Available for housing: $2,640 - $500 = $2,140

Important: The lower of your GDS and TDS limits determines what you qualify for.

The Mortgage Stress Test

Even if you qualify at 5.5%, you must prove you can afford payments at a higher rate.

Stress test rate: The higher of:

• Your contract rate + 2%
• 5.25% (minimum qualifying rate)

Example:

• You get approved at 5.5%
• Stress test rate: 7.5% (5.5% + 2%)
• You must qualify at 7.5%, even though you'll pay 5.5%

Impact on affordability:

Without stress test:

• Income: $80,000
• Could afford: ~$450,000 home

With stress test:

• Income: $80,000
• Can afford: ~$350,000 home

The stress test reduces buying power by roughly 20-25%.

Real-World Affordability Examples

Example 1: Single Buyer, No Debt

Profile:

• Annual income: $70,000
• Monthly gross: $5,833
• Down payment: $50,000
• No existing debts

GDS calculation (39%):

• Maximum: $5,833 × 39% = $2,275/month

Affordable home price:

• At 5.5% rate, 25-year amortization
• Property taxes: ~$300/month
• Heating: ~$100/month
• Available for mortgage: $1,875/month
• Home price: ~$385,000

Example 2: Couple, Some Debt

Profile:

• Combined income: $120,000
• Monthly gross: $10,000
• Down payment: $80,000
• Car loan: $450/month
• Student loan: $250/month

TDS calculation (44%):

• Maximum: $10,000 × 44% = $4,400/month
• Existing debts: $700/month
• Available for housing: $3,700/month

GDS calculation (39%):

• Maximum: $10,000 × 39% = $3,900/month

Affordable home price:

• Available for mortgage: ~$3,200/month (after taxes, heating)
• Home price: ~$650,000

Example 3: High Income, High Debt

Profile:

• Annual income: $150,000
• Monthly gross: $12,500
• Down payment: $100,000
• Car loans: $800/month
• Credit cards: $400/month
• Student loans: $500/month

TDS calculation:

• Maximum: $12,500 × 44% = $5,500/month
• Existing debts: $1,700/month
• Available for housing: $3,800/month

Despite high income, debt limits affordability:

• Home price: ~$700,000

If debts were paid off:

• Available for housing: $5,500/month
• Home price: ~$1,000,000

This is why paying off debt before buying makes such a huge difference.

Beyond the Bank's Formula

Banks tell you the maximum you can borrow. But should you borrow the maximum?

The 28/36 Rule (Conservative Approach)

A more conservative guideline:

• 28% of gross income for housing costs
• 36% of gross income for total debt

Example:

• Income: $80,000/year ($6,667/month)
• Housing budget: $6,667 × 28% = $1,867/month
• Total debt budget: $6,667 × 36% = $2,400/month

This leaves more breathing room than the bank's 39/44 limits.

The 25% Net Income Rule

Even more conservative: spend no more than 25% of your net (after-tax) income on housing.

Example:

• Gross income: $80,000
• Net income: ~$60,000 ($5,000/month)
• Housing budget: $5,000 × 25% = $1,250/month

This ensures you have plenty left for savings, emergencies, and enjoying life.

Hidden Costs That Reduce Affordability

Property Taxes

Vary significantly by location:

• Toronto: ~1% of home value annually
• Vancouver: ~0.25% of assessed value
• Calgary: ~0.6% of assessed value
• Montreal: ~0.7% of assessed value

Example:

• $500,000 home in Toronto
• Property tax: ~$5,000/year ($417/month)

Home Insurance

Typical costs:

• Detached home: $1,200-$2,000/year
• Condo: $400-$800/year

$500,000 home: ~$1,500/year ($125/month)

Condo Fees

If buying a condo:

• Average: $300-$600/month
• Luxury buildings: $800-$1,500/month

Remember: Only 50% of condo fees count toward GDS, but you pay 100%.

Utilities

Monthly costs:

• Electricity: $80-$150
• Gas/heating: $60-$200 (seasonal)
• Water: $50-$100
• Internet: $60-$100
• Total: $250-$550/month

Maintenance and Repairs

Budget 1% of home value annually:

• $400,000 home: $4,000/year ($333/month)
• $600,000 home: $6,000/year ($500/month)

Common expenses:

• Roof replacement: $8,000-$15,000 (every 20-25 years)
• Furnace replacement: $3,000-$6,000 (every 15-20 years)
• Water heater: $1,000-$2,000 (every 10-15 years)
• Appliances: $500-$2,000 each

CMHC Insurance

If you put down less than 20%:

• 5% down: 4.00% premium
• 10% down: 3.10% premium
• 15% down: 2.80% premium

Example:

• $500,000 home, 5% down
• Mortgage: $475,000
• Insurance: $19,000 (added to mortgage)
• New mortgage: $494,000

This increases your monthly payment by ~$100.

The True Cost of Homeownership

Let's compare what the bank says you can afford vs. what you'll actually pay:

$600,000 Home Purchase

Bank's calculation:

• Mortgage payment (5.5%, 25 years): $3,470/month
• Property taxes: $500/month
• Heating: $100/month
• Bank's total: $4,070/month

Reality:

• Mortgage payment: $3,470
• Property taxes: $500
• Home insurance: $150
• Utilities: $350
• Maintenance: $500
• Actual total: $4,970/month

You need an extra $900/month beyond what the bank calculates.

How Much Down Payment Do You Need?

Minimum Down Payment

• Under $500,000: 5%
• $500,000-$999,999: 5% on first $500k, 10% on remainder
• $1 million+: 20%

Example: $600,000 home

• 5% of $500,000 = $25,000
• 10% of $100,000 = $10,000
• Minimum: $35,000

Recommended Down Payment

20% down eliminates:

• CMHC insurance ($15,000-$25,000 saved)
• Higher interest rates
• Stricter qualification requirements

$600,000 home with 20% down:

• Down payment: $120,000
• Mortgage: $480,000
• Monthly payment: $2,775 (vs. $3,470 with 5% down)
• Savings: $695/month

Income Needed for Different Home Prices

Based on 39% GDS ratio, 5.5% rate, 25-year amortization:

$400,000 Home

• Down payment (5%): $20,000
• Monthly payment: ~$2,320
• Property taxes: ~$330
• Heating: ~$100
• Total: $2,750/month
• Income needed: ~$85,000/year

$500,000 Home

• Down payment (5%): $25,000
• Monthly payment: ~$2,900
• Property taxes: ~$415
• Heating: ~$100
• Total: $3,415/month
• Income needed: ~$105,000/year

$600,000 Home

• Down payment (5.8%): $35,000
• Monthly payment: ~$3,470
• Property taxes: ~$500
• Heating: ~$100
• Total: $4,070/month
• Income needed: ~$125,000/year

$750,000 Home

• Down payment (7.3%): $55,000
• Monthly payment: ~$4,260
• Property taxes: ~$625
• Heating: ~$100
• Total: $4,985/month
• Income needed: ~$155,000/year

$1,000,000 Home

• Down payment (20%): $200,000
• Monthly payment: ~$4,625
• Property taxes: ~$830
• Heating: ~$100
• Total: $5,555/month
• Income needed: ~$170,000/year

Strategies to Afford More House

1. Pay Off Debt First

Every $100/month in debt payments reduces your buying power by ~$20,000.

Example:

• Car loan: $400/month
• Pay it off before buying
• Increases affordability by ~$80,000

2. Increase Your Down Payment

Every extra $10,000 down:

• Reduces monthly payment by ~$60
• Saves ~$15,000 in interest over 25 years
• Might eliminate CMHC insurance

3. Buy with a Partner

Two incomes dramatically increase affordability:

Single buyer:

• Income: $70,000
• Affordable: ~$350,000

Couple:

• Combined income: $120,000
• Affordable: ~$650,000

4. Consider a Longer Amortization

25-year vs. 30-year amortization:

$500,000 mortgage at 5.5%:

• 25 years: $3,063/month
• 30 years: $2,838/month
• Saves: $225/month

Trade-off: Pay $82,000 more in interest over the life of the mortgage.

5. Look in Different Neighborhoods

Prices can vary dramatically within the same city:

Toronto example:

• Downtown condo: $700,000
• Scarborough house: $800,000
• Mississauga house: $900,000
• Oshawa house: $600,000

Moving 30-40 minutes away can save $100,000-$300,000.

6. Consider a Fixer-Upper

Homes needing cosmetic work sell for 10-20% less:

• $500,000 turnkey home
• $425,000 fixer-upper
• $30,000 in renovations
• Total: $455,000 (save $45,000)

Red Flags You're Buying Too Much House

1. You're Maxing Out Your Approval

If you're spending every dollar the bank will lend, you're probably overextending.

2. You Have No Emergency Fund

You should have 3-6 months of expenses saved AFTER your down payment and closing costs.

3. You Can't Afford Furniture

If you can't afford to furnish the place, you can't afford the place.

4. You're Stressed About the Payment

If you're losing sleep over whether you can make the mortgage payment, that's your gut telling you something.

5. You Have No Money for Fun

If homeownership means you can't travel, eat out, or enjoy hobbies, you'll resent the house.

The Rent vs. Buy Calculation

Sometimes renting is smarter financially:

When Buying Makes Sense

• You plan to stay 5+ years
• Home prices are stable or rising
• Rent is high relative to home prices
• You want stability and control

When Renting Makes Sense

• You might relocate soon
• Home prices are falling
• Rent is cheap relative to home prices
• You value flexibility

Example comparison:

Buying:

• $600,000 home
• $120,000 down (20%)
• Monthly cost: $4,500 (all-in)
• Annual cost: $54,000

Renting:

• Similar home: $2,800/month
• Invest $120,000 at 6% return
• Investment income: $7,200/year
• Net annual cost: $26,400

In this scenario, renting is $27,600/year cheaper. But you're not building equity.

Final Thoughts

The bank will tell you the maximum you can borrow. But only you know:

• Your job security
• Your other financial goals
• Your risk tolerance
• Your lifestyle priorities

A good rule of thumb: If the mortgage payment makes you uncomfortable, the house is too expensive. You should be able to afford your home and still save for retirement, take vacations, and enjoy life.

Ready to calculate your home affordability? Use our Home Affordability Calculator to see exactly how much house you can afford based on your income, debts, and down payment.

Disclaimer: This guide provides general information about home affordability. Actual mortgage approval depends on many factors including credit score, employment history, and lender policies. Consult with a mortgage broker for personalized advice.