GDS Ratio (Housing Limit) Max 39% of gross income for housing (Score 680+).
$$GDS = \frac{Mortgage + Tax + Heat + (0.5 \times Condo)}{Monthly Income}$$

TDS Ratio (Debt Limit) Max 44% of gross income for all debt (Score 680+).
$$TDS = \frac{Housing + Debts}{Monthly Income}$$

Stress Test Rate $$i_{stress} = \max(\text{Rate} + 2\%, 5.25\%)$$

Quebec Welcome Tax (Outside MTL 2026)

First $62,900	0.5%
$62,901 - $315,000	1.0%
$315,001 - $552,300	1.5%
Above $552,300	3.0%