Mortgage Affordability Calculator

How Much Mortgage Can You Afford in Canada?

Determining how much home you can afford is one of the most important steps in the Canadian home-buying process. Unlike simply looking at monthly payments, Canadian lenders use a comprehensive affordability assessment that includes two key debt service ratios and a mandatory stress test. This free calculator performs all three calculations to give you an accurate picture of your maximum home price.

The Two Pillars: GDS and TDS Ratios

Canadian mortgage qualification relies on two fundamental ratios. The Gross Debt Service (GDS) ratio ensures that your total housing costs, including mortgage payments, property taxes, heating, and half of any condo fees, do not exceed 39% of your gross monthly household income. The Total Debt Service (TDS) ratio adds all other monthly debt obligations to the housing costs and caps the total at 44% of gross income. Your affordability is determined by whichever ratio is more restrictive.

Understanding the B-20 Stress Test

Since January 2018, all Canadian mortgage borrowers at federally regulated lenders must pass the B-20 stress test. This means you must qualify for your mortgage at a rate that is the higher of your actual contract rate plus 2 percentage points or a minimum qualifying rate of 5.25% (as of 2024). The stress test was introduced by OSFI to ensure borrowers can handle potential interest rate increases, protecting both homeowners and the financial system. While it reduces the maximum amount you can borrow, it provides an important safety buffer.

Factors That Affect Your Affordability

Several factors influence how much mortgage you can qualify for. Your gross household income is the primary driver, as both GDS and TDS are calculated as a percentage of income. Monthly debt payments directly reduce your borrowing capacity through the TDS ratio. The current interest rate affects monthly payments, and the stress test rate magnifies this effect. Property taxes, heating costs, and condo fees are often overlooked but are included in the GDS calculation and can significantly impact your maximum home price.

Down Payment Requirements in Canada

Canada has specific minimum down payment requirements based on the purchase price. For homes up to $500,000, the minimum down payment is 5% of the purchase price. For homes between $500,000 and $1,499,999, you need 5% on the first $500,000 and 10% on the portion above. For homes priced at $1,500,000 or more, a 20% down payment is required. If your down payment is less than 20%, you must purchase mortgage default insurance from CMHC, Sagen, or Canada Guaranty, which adds a premium to your mortgage.

Why Real Estate Agents Must Understand Affordability

For students preparing for Canadian real estate licensing exams, mortgage qualification is a core topic. RECO, BCFSA, and RECA exams all test your understanding of GDS and TDS calculations, stress test requirements, and how to advise clients on affordability. As a practicing agent, being able to explain these concepts helps clients set realistic expectations, strengthens your professional credibility, and ensures you are working with qualified buyers who can close their transactions.