Total Debt Service Ratio

The Total Debt Service ratio is monthly housing costs (mortgage principal and interest, property taxes, heating, and strata fees if applicable) plus all other debt payments (car loans, student loans, lines of credit, credit-card minimums) divided by gross monthly income. Most federally regulated lenders cap TDS at 44% (as of 2026-07-27 — verify current) for insured mortgages under guidelines published by the Office of the Superintendent of Financial Institutions (OSFI) and Canada Mortgage and Housing Corporation (CMHC). This is a standard underwriting metric; verify current lender requirements with a mortgage professional before applying.

No BC provincial statute in the whitelist—including the Real Estate Services Act (RESA), SBC 2004, c. 42, or regulations administered by the British Columbia Financial Services Authority (BCFSA)—sets a mandatory maximum TDS ratio. TDS caps are established by federal agencies (OSFI, CMHC) and individual lenders' underwriting policies. Verify the specific ratio applied to your mortgage with your lender or a licensed mortgage broker.

The Gross Debt Service (GDS) ratio includes only housing-related costs (mortgage principal and interest, property taxes, heating, and strata fees) divided by gross monthly income, while the Total Debt Service (TDS) ratio adds all other debt obligations (car loans, student loans, lines of credit, credit cards) to the numerator. Most lenders require both ratios to stay below thresholds—typically 39% GDS and 44% TDS (as of 2026-07-27 — verify current)—as guidance from CMHC and OSFI. Verify current qualifying ratios with a mortgage professional before applying.

The TDS ratio includes monthly housing costs (mortgage principal and interest, property taxes, heating, and strata fees under the Strata Property Act, SBC 1998, c. 43, if applicable) plus all other monthly debt obligations such as car loan payments, student loan payments, personal lines of credit, and minimum credit-card payments. One-time or irregular debts are not typically included; verify your lender's specific debt-inclusion criteria with a mortgage professional or the Financial Consumer Agency of Canada (FCAC) resources.

Yes—reducing or eliminating monthly debt obligations (car loans, credit-card balances, lines of credit) directly lowers the numerator of the TDS ratio, which may improve your borrowing capacity under lender underwriting guidelines. No BC statute in the whitelist mandates this strategy; it is a practical application of standard mortgage qualification criteria published by CMHC and federally regulated lenders. Verify the impact on your specific mortgage pre-approval with a licensed mortgage broker or lender before acting.

Yes—monthly strata fees (also called maintenance fees or strata contributions) payable under the Strata Property Act, SBC 1998, c. 43, are included in the housing-cost portion of both the GDS and TDS ratios. Lenders also consider the strata corporation's financial health and reserve-fund status when underwriting. Verify how your lender treats strata fees and any special levies in the TDS calculation before finalizing a purchase contract.

The 44% TDS cap (as of 2026-07-27 — verify current) is a guideline primarily applied by federally regulated lenders to insured high-ratio mortgages (those with less than 20% down payment) under CMHC and OSFI rules. Private or credit-union lenders in BC may apply different ratios depending on their own underwriting policies and the British Columbia Financial Services Authority (BCFSA) regulatory framework. Verify the TDS threshold for your specific mortgage product with your lender or mortgage broker.

Gross monthly income is the denominator in the TDS ratio calculation; it includes employment income, self-employment income, rental income (if applicable), and other verifiable sources before deductions. Lenders typically require documentation such as pay stubs, T4 slips, Notice of Assessments, and rental agreements; self-employed borrowers may need additional verification as outlined by CMHC underwriting standards. Verify acceptable income documentation and calculation methods with your lender or a licensed mortgage professional before applying.

Most lenders allow a portion of documented rental income—often 50% to 100% (as of 2026-07-27 — verify current), depending on underwriting guidelines—to be added to gross monthly income, which lowers the TDS ratio. The suite must comply with municipal zoning under the Local Government Act, RSBC 2015, c. 1, and any relevant small-scale multi-unit housing (SSMUH) rules introduced by the Housing Statutes (Residential Development) Amendment Act, 2023 (BC Bill 44, effective July 1, 2024 for most municipalities — verify current). Verify rental-income treatment and documentation requirements with your lender or mortgage broker before relying on this income.

Federal guidance is published by Canada Mortgage and Housing Corporation (CMHC) at www.cmhc-schl.gc.ca and the Financial Consumer Agency of Canada (FCAC) at www.canada.ca/en/financial-consumer-agency. The British Columbia Financial Services Authority (BCFSA) at www.bcfsa.ca regulates mortgage brokers under the Real Estate Services Act (RESA), SBC 2004, c. 42, but does not set TDS caps. Verify current TDS requirements, lender-specific policies, and your personal qualification with a licensed mortgage broker, BC lawyer, or notary before acting.