The Canada Mortgage and Housing Corporation's insurance rules apply once a down payment sits under 20 percent, and every federally regulated lender must qualify a buyer against a stress-tested rate higher than the contract rate. Minimum down payment is 5 percent on the first $500,000 of the price and 10 percent above that, which sets the floor a buyer needs before a lender even runs the rest of the calculation.
Debt load matters as much as income. A buyer carrying a car loan or student debt will qualify for a smaller mortgage than one with the same income and no other payments, which is why two buyers earning the same salary can walk away with very different approved amounts.
The pre-approval number from a lender, not a general rule of thumb, is what actually sets a Saskatoon first-time buyer's budget. Get your hand-reviewed valuation from Joel Dyck.