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What mortgage amount can you get? (Stress Test)

Region: Ontario Answer # 408

When buying a home, the generally accepted practice is that the purchaser spends no more than 25% of their gross monthly income on principal, interest and taxes. Financial institutions use established formulas to calculate the exact amount of a mortgage loan they think you can reasonably handle, taking into account your existing debts and the various other expenses that are involved in owning a home.

The two most commonly used financial formulas are:

  1. Gross Debt Service (GDS) ratio: the percentage of gross income (before deductions such as income tax) required to cover the costs associated with your home, such as mortgage payments, property taxes and heating; and
  2. Total Debt Service (TDS) ratio: the percentage of gross income (before deductions such as income tax) required to cover the costs associated with your home, such as mortgage payments, property taxes and heating, plus other debts, such as credit card payments, car payments or lines of credit.

GDS and TDS requirements

For all buyers:

  • the maximum spending limit used by most lenders is 39% of income on home-carrying costs (GDP) like mortgage payments, heat and taxes; and
  • the maximum TDS spending limit used by most lenders is 44%.

Mortgage lenders will use these ratios to determine the maximum amount they will lend you.

Minimum Qualifying Rate/Stress Test

In January 2018, the Government of Canada’s Office of the Superintendent of Financial Institutions (OSFI) amended the mortgage rules introduced in 2016 that require Canadian home buyers to take a mortgage “stress test” to qualify for a mortgage at a bank. Under this test, home buyers qualify for their mortgage using a minimum qualifying rate (MQR).

The requirement was created to ensure that the home buyer could still afford the mortgage if interest rates were to rise.

As of June 1, 2021, the minimum qualifying rate requirement applies to all buyers:

  • Insured (those with less than a 20% down payment – need mortgage insurance); and
  • Uninsured (those with a 20% or more down payment – do not need mortgage insurance)

The requirement is as follows:

  • the minimum qualifying rate will be the greater of the contracted rate plus 2 percent or 5.25 percent – whichever is higher.

This requirement does not apply to grandfathered loans, which are any of the following:

  • loans made before October 17, 2016, and their renewals,
  • mortgage loan insurance applications received before October 17, 2016,
  • where the lender made a legally binding commitment to make the loan before October 17, 2016; or
  • the borrower entered into a legally binding agreement of purchase and sale for the property against which the loan was secured before October 17, 2016.

The new requirement does not apply to mortgage renewals, as long as they are with the borrower’s existing lender.

Federally regulated Canadian banks must establish loan to value (LTV) limits that are in line with the stress test and take risk into consideration. These LTVs are to be updated by the banks to reflect changes in the housing market and the economic environment.

Loans through other lenders:

Further, banks are prohibited from arranging loans through other lenders for residential mortgages, where the loan is not within the LTV limit. The restriction only applies to new transactions and does not apply in cases where the other lender providing the secured funding is municipal, territorial or provincial, or the federal government.

For more information, visit the Office of the Superintendent of Financial Institutions (OSFI), or  CMHC, Canada Mortgage and Housing Corporation, a government owned institution that is the main provider of housing and mortgage insurance information in Canada.

If you are buying a home and want to know how much of a mortgage you qualify for, use the Scotiabank mortgage calculator .

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