Household ratios and property cash flow
GDS and TDS compare eligible housing costs and other debt commitments with qualifying gross income. Rental operating cash flow answers a different question: whether rent covers operating expenses and financing. Keep separate worksheets so the same expense or rent is not counted twice.
Use a documented rental method
The treatment of rent can depend on occupancy, unit count, whether the property is the subject of the application and insurer or lender policy. CMHC’s published ratio guidance is a reference for its framework, not a universal approval line. Ask the lender to show the rental adjustment and the income denominator it accepts.
Test the assumptions that move the result
A higher qualifying payment, property-tax increase or lower recognized rent can change qualification. Vacancy and repairs may hurt actual cash flow even if they are not entered identically in a lender ratio. Document both the formal calculation and the cash costs your household will carry.
A question worth asking
Are 39% and 44% universal approval thresholds?
No. They are associated with CMHC guidance. Other lender rules, documentation and the complete application still matter.
Check the source
Primary references checked October 28, 2026. Rules and product availability can change; confirm the requirements for your actual transaction.