How is it calculated?
GDS = (mortgage payment at the qualifying rate + property tax + heat + half of condo fees) ÷ gross monthly income. TDS adds your other debt payments.
What should I do with the result?
Use it to set a budget or a target rate, then let lenders bid on your actual mortgage. Bids include rate, penalty method, prepayment and fees, so you can compare the full cost.
MBWritten by the MortgageBids.ca editorial team. Last updated October 7, 2026. General information only; your lender confirms terms for your file.
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