Debt-to-Income Ratio (GDS/TDS) in Quebec: 2026 Limits

For a home purchase in Quebec, the debt-to-income ratio actually means two ratios your lender examines: the GDS (Gross Debt Service) and the TDS (Total Debt Service). The lender compares them to limits to decide whether to approve you. The phrase is confusing: it also has a business meaning and an insolvency meaning, and the American (28/36) or French (35%) rules that circulate don't apply here. This guide settles which one counts, gives the 2026 limits (insured and uninsured) and calculates your ratios step by step, at the stress-test rate. First action: figure out which "debt-to-income ratio" someone means — to buy, it's GDS/TDS.

Key takeaways

• To buy in Quebec, "debt-to-income ratio" = two ratios: the GDS (housing costs ÷ gross income) and the TDS (housing + all your other debts ÷ gross income).
• 2026 limits: insured mortgage (down payment < 20%) → GDS ≤ 39%, TDS ≤ 44%; uninsured mortgage (≥ 20%) → often ~35% / ~42%, depending on the lender.
• You calculate with the payment at the stress-test rate = the greater of 5.25% or your rate + 2% — not your actual rate.
• A plex's rental income (duplex to fourplex) counts, but with a haircut (~50%).
• Ratios too high? Pay down the high-payment debts, increase the down payment or lengthen the amortization.

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"Debt-to-income ratio": three meanings, only one counts for buying

The same phrase covers three different calculations. For a home purchase in Quebec, only one concerns you.

• Meaning #1 — mortgage qualification (yours). These are the GDS (your housing costs ÷ your gross income) and the TDS (housing + all your debts ÷ your gross income). This is what CMHC, the FCAC and the OACIQ check.
• Meaning #2 — business. Total debt ÷ assets (or ÷ equity), with a limit around 60%. That serves to analyze a company, not a buyer.
• Meaning #3 — insolvency. The overall weight of your debts to assess a consolidation, on a "less than 30% / 30–40% / more than 40%" scale. That's the tool of licensed insolvency trustees, not the mortgage lender.

Don't confuse them either: the "28% / 36%" rule is American and the "35%" rule is French (HCSF). In Quebec, we talk about the GDS and TDS, with CMHC's limits.

Action point: to buy a property, keep only meaning #1 — the GDS and the TDS.

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GDS and TDS: what each ratio includes

The GDS counts only your housing costs. The TDS adds all your other debts. Both are divided by your gross monthly income (before tax).

Expense	GDS (Gross Debt Service)	TDS (Total Debt Service)
Mortgage payment (principal + interest)	✅	✅
Municipal and school taxes	✅	✅
Heating	✅	✅
50% of condo fees	✅	✅
Car loan, student loans	❌	✅
Min. card/line payments (~3% of balance)	❌	✅
Support (alimony) payments	❌	✅

The calculation rule is simple:

Ratio = (relevant expenses ÷ gross monthly income) × 100

Two details many people forget: you count 50% of condo fees (not zero), and minimum card or line-of-credit payments are worth about 3% of the balance. That's what CMHC's official GDS/TDS calculation sets out.

Action point: list your housing costs first (GDS), then add all your debts (TDS); these two figures then drive your borrowing capacity.

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The 2026 limits: insured (39/44) vs uninsured (~35/42)

The limits depend on your down payment.

Situation	Down payment	Max GDS	Max TDS
Insured mortgage (CMHC)	< 20%	≤ 39%	≤ 44%
Uninsured mortgage (conventional)	≥ 20%	often ~35%	often ~42%

The insured limits (39% / 44%) are set by CMHC and apply when your down payment is under 20%; CMHC's own page states lenders restrict ratios to 39% (GDS) and 44% (TDS). The uninsured limits are set by each lender and vary with your credit file and your down payment; National Bank, for example, targets a GDS of 32 to 39%. Reminder: mortgage insurance only exists for a property under $1.5M; above that, you're necessarily uninsured (≥ 20%).

Action point: ask your lender for its uninsured limits before you shop, especially if your down payment reaches 20%.

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Calculate your debt-to-income ratio step by step (2026 example)

Four steps are enough:

1. Gross monthly income: your annual income ÷ 12, rounded down.
2. Housing costs: the mortgage payment at the stress-test rate (see the callout) + municipal and school taxes + heating + 50% of condo fees.
3. Calculation: GDS = step 2 ÷ step 1 × 100; TDS = (step 2 + your other debts) ÷ step 1 × 100.
4. Comparison: measure your two ratios against the limits above.

Worked example (Quebec, 2026). Marie earns $89,000/year, i.e. $7,416/month ($89,000 ÷ 12, rounded down). Her housing costs, payment computed at the qualifying rate: $2,000 (principal and interest) + $292 in taxes + $175 (50% of $350 in condo fees) + $100 in heating = $2,567.

• GDS = 2,567 ÷ 7,416 = 34.6% → under the 39% limit. ✅
• Adding $325 of car loan: TDS = 2,892 ÷ 7,416 = 39.0% → under the 44% limit. ✅

Verdict: her file is eligible (insured mortgage).

The stress-test trap. The payment counted isn't the one at your actual rate, but the one computed at the greater of 5.25% or your rate + 2% (the OSFI rule). In 2026, a 5-year fixed runs around 4.09%: so you qualify at about 6.09%. Many consumer calculators ignore this and underestimate your ratios.

Action point: enter your income and debts in the borrowing-capacity calculator — it applies the limits and the stress test for you; the mortgage calculator gives you the payment to put in the numerator.

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Rental income: a plex's effect on your ratios

Yes, rents count — but the lender applies a haircut. Depending on the lender, it works two ways:

• Rent offset: about 50% of the gross rent (sometimes 70 to 80%) reduces your housing costs, so your GDS.
• Add to income: about 50% (sometimes 70%) of the gross rent is added to your qualifying income, lowering both ratios.

Why the haircut? It covers vacancy, management and repairs — the lender never assumes 100% of the rents. (CMHC confirms it will count up to 50% of gross rental income toward your income when the property is the subject of the insurance application.) On the down-payment side, a plex you live in finances from 5% (duplex) or 10% (triplex or fourplex); count 20% for pure rental (non-owner-occupied).

Action point: for a plex, confirm how your lender treats the rent (method and percentage used) — that's what changes your eligibility. First estimate the project's rental yield.

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Your ratios too high? Six levers

If you exceed the limits, act in this order:

1. Pay down or consolidate high-monthly-payment debts (car, cards): target the payment, not the balance.
2. Increase your down payment: a smaller loan lowers the payment, so the GDS.
3. Lengthen the amortization (25 → 30 years if you qualify: first-time buyer or newly built property).
4. Add a co-borrower: their income enters the calculation.
5. Choose a cheaper property: it directly cuts the housing costs.
6. Bring in eligible rental income (a plex — see the previous section).

Action point: attack the debt with the biggest monthly payment first — it's the one that weighs down your TDS — then validate the whole thing with a pre-approval.

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Common mistakes

1. Confusing the three "debt ratios." To buy, it's GDS/TDS — not the business ratio or the insolvency scale.
2. Calculating with your actual rate instead of the stress-test rate: you wrongly think you qualify.
3. Believing 39/44 applies to everyone. Those are the insured limits; uninsured, it's often ~35 / 42.
4. Forgetting the 50% of condo fees (and the school taxes, and the heating) in the GDS.
5. Counting 100% of rental income. The lender applies a haircut of about 50%.
6. Borrowing an American rule (28/36) or a French one (35%). In Quebec, the CMHC/FCAC limits apply.

Action point: before you conclude, check three things — qualifying rate used? right limits (insured or uninsured)? Canadian source?

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In short, the debt-to-income ratio that decides a purchase in Quebec is the GDS and the TDS: limits based on your down payment, calculation at the stress-test rate, rents counted with a haircut. Check your debt scenario in the borrowing-capacity calculator before you submit an offer.

Transparency and updates. The example amounts are realistic assumptions for 2026, to be replaced with your figures. The uninsured limits, the qualifying rate and the treatment of rental income vary by lender, your credit score and the product. The rules and rates cited are in force in June 2026 (policy rate 2.25%, 5-year fixed ≈ 4.09%, qualification ≈ 6.09%); validate your case with a broker or our calculators before making an offer.

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Sources: CMHC (GDS/TDS calculation, inclusions, 50% condo fees, 39/44 limits); FCAC / Canada.ca (affordability tool, 39/44); OACIQ (regulatory definition of the GDS); nesto (worked example, insured and uninsured limits, stress-test payment, updated February 2026); Ratehub (39/44); National Bank (GDS 32–39%); OSFI (stress test = greater of 5.25% or rate + 2%); QC field research (rental income treatment ~50%, plex down payments 5/10/20%).

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