Before you calculate
Affordability is the payment you can live with.
Mortgage affordability depends on income, debts, down payment, stress-test rates, property tax, heating, condo fees, credit history, and lender rules.
GDS looks at housing costs against income. TDS adds other debt payments, which is why car loans, credit cards, and student loans can reduce mortgage room.
Use this estimate to set a shopping range before getting a lender or broker quote.