09/04/2026
The first number a mortgage broker needs to understand is often your income—not your credit score.
Your credit history matters, but before a lender can estimate a mortgage amount, they need to review your verifiable income and current debt obligations.
Two key affordability measurements are:
Gross Debt Service (GDS): Compares your housing costs to your gross income. Housing costs can include your mortgage payment, property taxes, heating, and 50% of condo fees where applicable.
Total Debt Service (TDS): Adds your other monthly debt obligations—such as vehicle payments, student loans, lines of credit, and credit-card minimum payments—to those housing costs.
The Financial Consumer Agency of Canada’s mortgage qualifier uses guideline ratios of up to 39% GDS and 44% TDS. CMHC also describes those same limits for its mortgage-insurance underwriting criteria, though lenders assess every application individually.
For first-time home buyers in Kitchener-Waterloo, including newcomers and professionals relocating for tech or university opportunities, this is why two people with similar credit scores can have very different mortgage budgets.
Want to understand what to prepare before your mortgage pre-approval? Message me “BUDGET” for a clear Kitchener first-time buyer roadmap. For personal lending advice, connect with a licensed mortgage professional.