How large a mortgage your income can support.
How large a mortgage your income can support.
Canadian lenders look at two ratios. GDS (Gross Debt Service) is your housing cost as a percentage of gross income — most lenders cap this around 39%. TDS (Total Debt Service) adds in all your other debts and caps around 44%.
This calculator uses a simplified GDS approach: take your monthly income, allow 39% for housing, subtract existing debt payments, and back-solve for the mortgage size that supports that housing cost over 25 years at the rate shown.
Real qualification is more nuanced: lenders stress-test you at the higher of the contract rate plus 2% or the qualifying rate, factor in property taxes and heat, and weigh your credit score and down payment source. Use this as a directional estimate, not a guarantee.
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