Canada · CAD · Mortgage & qualification

GDS / TDS Ratio Calculator

Published by REO Technologies · Publisher contact: Abdul Raheem. Explanation and example arithmetic revised 2026-10-26; source-specific dates are stated separately. No licensed financial review is claimed.

Calculate housing and total-debt ratios from actual qualifying payments and living costs.

Enter current figures from your documents and quotes. Budget settings are editable. Inputs stay in this tab and are not saved or sent by the calculator.

Reference scope documented 2026-10-25: standard qualifying rate max(contract + 2 percentage points, 5.25%); purchase insurance cap below CAD 1.5 million; 30-year insured scenarios require confirmed eligibility. Enter current personal quotes; these rules do not establish approval. CMHC source · OSFI source.

Your inputs

How this estimate works

GDS = (mortgage + annual tax / 12 + heat + half the full condo fee + ground rent) / gross monthly income. TDS includes the other debt payments as well.

Assumptions and limits

Use your lender’s qualifying mortgage and debt amounts, including applicable credit-card/line-of-credit treatment.
CMHC’s common 39%/44% criteria are not universal limits or an approval promise. Half of condo fees is the modeled qualifying amount; your cash budget still needs the full fee.

References and further reading

Worked Canada example: GDS / TDS Ratio Calculator

This is a hypothetical arithmetic example in CAD, not a current lender quote, market observation or borrower record. The same calculator model produces the figures below. Its input assumptions are shown so that you can reproduce or change the scenario.

Assumed input	Illustration value
Gross monthly qualifying income (CAD)	12,500
Qualifying monthly P&I including financed premium (CAD)	2,800
Annual property tax (CAD)	3,000
Monthly heating (CAD)	120
Full monthly condominium fee (CAD)	0
Monthly ground / site rent (CAD)	0
Other monthly debt payments (CAD)	0

Calculated measure	Result
Monthly housing included in ratios	CA$3,170.00
Gross debt service ratio	25.36%
Total debt service ratio	25.36%
Gross income less modeled obligations	CA$9,330.00

Amounts use unrounded intermediate arithmetic and are rounded only for display. Selecting different costs, rates, payment dates or terms changes the result; no illustration value is prefilled into your personal financial fields.