The gap between GDS (39%) and TDS (44%) gives you just 5% of gross income for all non-housing debts — including student loans, car payments, and credit card minimums.
Example: Student Debt Impact on Buying Power
Gross Income
Monthly Student Loan
Max Mortgage (No Student Debt)
Max Mortgage (With Student Debt)
Buying Power Lost
$60,000
$300
$275,000
$220,000
$55,000
$60,000
$500
$275,000
$180,000
$95,000
$80,000
$300
$375,000
$320,000
$55,000
$80,000
$500
$375,000
$280,000
$95,000
$100,000
$300
$475,000
$420,000
$55,000
$100,000
$500
$475,000
$380,000
$95,000
Average Student Debt in Canada
Level of Education
Average Debt at Graduation
Typical Monthly Payment
College diploma
$15,000–$20,000
$175–$230
Bachelor’s degree
$28,000–$35,000
$325–$400
Master’s degree
$30,000–$45,000
$350–$520
Professional degree (law, medicine)
$70,000–$120,000
$810–$1,390
Strategies to Buy a Home with Student Debt
Strategy 1: Optimize Your Debt Payments Before Applying
Action
Impact on TDS Ratio
Switch to extended repayment (14.5 years)
Lowers monthly payment ~30%
Pay off highest-payment debt first
Directly reduces TDS
Consolidate student loans at lower rate
May reduce monthly payment
Refinance through a bank at lower rate
Reduces monthly obligation
Strategy 2: Use Income-Driven Repayment Strategically
Repayment Plan
Monthly Payment
Impact on Mortgage Qualification
Standard (9.5 years)
$400
Higher payment hurts TDS
Extended (14.5 years)
$280
Lower payment helps TDS
RAP (Repayment Assistance Plan)
$0–$200
Very low payment; lender may question stability
Important: Lenders will use your actual monthly payment amount for TDS calculations. If your RAP payment is $0, some lenders may still impute a payment amount.
Strategy 3: Increase Your Income
Every additional $10,000 in income adds approximately $45,000-$50,000 in mortgage qualification:
Income Boost Strategy
Potential Additional Income
Side gig or freelancing
$5,000–$20,000/year
Negotiate a raise
$5,000–$15,000/year
Switch jobs
$10,000–$30,000/year
Add a rental income stream
$12,000–$30,000/year
Strategy 4: Save a Larger Down Payment
Down Payment
Monthly Savings
Impact
5% on $400K = $20,000
Minimum required
CMHC insurance adds ~$13,000
10% on $400K = $40,000
Lower insurance premium
CMHC insurance ~$9,600
20% on $400K = $80,000
No CMHC insurance
Monthly payment drops $50+/month
Strategy 5: Leverage First-Time Buyer Programs
Program
Max Benefit
How It Helps
FHSA
$40,000 tax-free savings
Tax-deductible contributions + tax-free growth for down payment