Glossary
Debt-to-Income Ratio
Your total debt compared with your total income — a broader measure than the debt service ratios Canadian lenders use at approval..
A debt-to-income ratio compares your total debt — mortgage payments, credit cards, car loans, lines of credit and other obligations — against your total income, giving a broad picture of how much you owe relative to what you earn. It is a wider measure than the debt service ratios Canadian lenders use when approving a mortgage.
How Canadian lenders actually measure debt
In Canada, mortgage qualification is normally assessed with two ratios rather than a single debt-to-income figure: the gross debt service ratio (GDS), which covers housing costs alone, and the total debt service ratio (TDS), which adds other debt payments to housing costs. Both are expressed as a percentage of gross household income and measured against lender and insurer limits. Federally regulated lenders follow OSFI Guideline B-20, and insured mortgages must also pass the federal mortgage stress test, which qualifies the borrower at a higher interest rate than the contract rate.
A debt-to-income ratio is broader and less standardised. Private and alternative lenders, and financial analysts, sometimes use it to summarise overall leverage, and it can include obligations that GDS and TDS treat differently or leave out.
What counts as debt and as income
On the debt side, lenders typically count:
- mortgage principal, interest and the property tax portion of the payment
- credit card minimum payments
- car loans, student loans and personal lines of credit
- payments on a home equity line of credit
- court-ordered support payments
On the income side, they usually start with documented gross income and may add items such as rental offset from a secondary suite. Self-employed borrowers are commonly assessed on averaged net income, with supporting documentation.
Why the ratio matters to a borrower
Two households can earn the same income and qualify for very different mortgages. One carries only a mortgage; the other carries a car loan, revolving credit card balances and a line of credit. The second has a higher debt-to-income ratio and, in practice, a lower borrowing limit, because those extra payments consume room under the lender's total debt service ceiling before the new mortgage payment is considered.
A high ratio also reduces resilience. When a variable payment changes or a mortgage renews, a household already stretched by consumer debt has less margin. Paying down revolving balances, consolidating high-interest debt through a debt consolidation, or clearing a car loan before applying are common ways borrowers change the picture. Running the numbers with an affordability calculator can show how much borrowing room remains.
Frequently asked questions
What is a good debt-to-income ratio in Canada?
There is no single published figure. Canadian lenders assess gross debt service and total debt service ratios against their own limits and those set by the mortgage default insurer, and limits can differ by lender, property type and borrower profile. A lower ratio generally leaves more borrowing room, so confirm current limits with the lender or insurer.
Is debt-to-income ratio the same as TDS?
No. Total debt service ratio is a Canadian mortgage qualification measure that counts housing costs plus other debt payments as a share of gross household income. Debt-to-income is broader and less standardised, sometimes including obligations that TDS excludes. It is used informally, by private lenders, and in general financial analysis rather than as a standard insured-mortgage test.
Does my debt-to-income ratio affect my mortgage rate?
Only indirectly. It mainly affects how much you can borrow and whether you qualify, and some lenders or insurers apply different limits or pricing to higher-risk files. A lower ratio improves your options but does not guarantee a particular rate, since rates also depend on credit score, down payment, property type and term.
Sources
Related terms
- Total Debt Service Ratio (TDS) — The Total Debt Service Ratio (TDS) is the share of gross income that goes toward all debt payments, capped at 44% by most Canadian lenders.
- Debt Service Ratio — A measure comparing your housing and other debt payments with your income, used by Canadian lenders when deciding whether you qualify for a mortgage.
- Gross Debt Service Ratio (GDS) — The share of gross household income that goes to housing costs — mortgage principal and interest, property taxes, heating, and half of condo fees — commonly capped at 39%.
- Mortgage Stress Test — The federal mortgage stress test is a qualification rule that makes lenders check whether you could afford your mortgage if rates were higher than your contract rate.
- Debt Consolidation — Debt consolidation means combining several debts, such as credit cards and loans, into one loan or payment, often to lower the total interest cost.