Total Debt Service Ratio (TDS) Your Total Debt Service Ratio (TDS) is the percentage of gross annual income required to cover housing payments and any other debts and obligations you may have. Total Monthly Household Income $4,500x40%...$1,800.00 Less Property Tax, ½ of Condo Fees, Heating Cost, and Loan Payments...$679.00 Maximum Monthly Mortgage Payment (based on TDS guidelines)...$1,121.00 Use the lower of your GDS and TDS maximum monthly mortgage payment calculations to determine your affordable mortgage. For qualification purpose, at minimum the three-year interest rate (Current Rates), or longer term rate must be used. Lower of GDS and TDS figures Divided by Monthly Mortgage Factor of 00.640 at 6% Your Affordable Mortgage is (includes 3.25% CMHC or GE Capital)...$175,100. Example: Purchase Price $177,500.00 5% Down Payment -$    8,875.00 Subtotal $168,625.00 3.25% CMHC $    5,480.31 New Mortgage $174,105.31