GDS and TDS Ratios in Canada
Learn how gross debt service and total debt service ratios affect Canadian mortgage affordability estimates.
Updated June 23, 2026
GDS looks at housing costs
Gross debt service, or GDS, compares expected housing costs with gross household income. Housing costs can include the mortgage payment, property tax, heating, and part of condo fees when applicable.
The Canooq affordability calculator uses a simplified GDS limit to estimate how much payment may fit before other debt is considered.
TDS includes other debts
Total debt service, or TDS, adds other recurring debt payments such as car loans, student loans, lines of credit, and credit card payments.
This is why two households with the same income and down payment can qualify for different mortgage amounts. Existing monthly debt can crowd out mortgage room quickly.
Next steps
Sources and limits
This page is educational and does not replace mortgage, legal, tax, or real estate advice. Confirm current rules and your personal situation before making an offer or choosing a mortgage.
Common questions
Are GDS and TDS the only approval rules?
No. Lenders also review credit, income stability, documents, down payment source, property details, appraisal, and insurer or lender rules.
Can paying debt improve mortgage affordability?
Often yes. Lower recurring debt payments can improve the total debt service side of an affordability estimate.