How Much Mortgage Can I Afford in Quebec? (2026)

How much mortgage can you afford? Your borrowing capacity is the maximum amount a lender will lend you to buy a property. In Quebec, that number depends on five things: your eligible income, your debts, your housing costs, your down payment and your credit file. Careful, though: it's a theoretical maximum, not necessarily the amount it's wise to borrow. Forget French (euro) or American (US-dollar) simulators; the Canadian rules are different. This guide walks through the real calculation: the GDS/TDS ratios, the stress test, a worked 2026 example and how a plex's rental income changes things. First action: gather your gross income, your monthly debts and your available down payment.

Key takeaways

• Your borrowing capacity is the maximum a lender will advance: a theoretical ceiling, not the prudent amount to borrow.
• It depends on 5 ingredients: eligible income, debts, housing costs, down payment and credit file.
• Two ratios cap it: GDS ≤ 39% and TDS ≤ 44% (CMHC insured maximums).
• The stress test qualifies you at the higher of 5.25% or your rate + 2%: the real amount is lower than the posted rate suggests.
• A plex's rental income raises your capacity.

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What is borrowing capacity? The 5 ingredients

Borrowing capacity is the most a lender will lend you. It's a theoretical ceiling: aiming for it puts your real budget (daycare, groceries, surprises) under strain.

The lender starts from your income, then caps it with two ratios and one rate test. The 5 ingredients of the calculation:

1. Eligible income: salary, but also bonuses, commissions and rental income, which are weighted or averaged (rarely counted at 100%).
2. Existing debts: car, cards, lines of credit, student loans, support payments.
3. Housing costs: mortgage + municipal and school taxes + heating + 50% of condo fees.
4. Down payment: the higher it is, the lower the loan you need.
5. Credit file and score: you generally need a score of at least 600 for an insured mortgage (a mortgage with a down payment under 20%, so insured by CMHC).

Action point: gather your five numbers first: gross income, monthly debt payments, taxes and heating, down payment, credit score. If your income includes bonuses, commissions or rent, ask your broker how they'll be weighted before counting on them.

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The GDS and TDS ratios explained (with thresholds)

Two ratios limit any borrowing capacity. Together, they form what lenders call the debt ratio.

GDS (gross debt service) counts only housing:

GDS = (mortgage payment + municipal and school taxes + heating + 50% of condo fees) ÷ gross income

TDS (total debt service) adds all your other debts:

TDS = (housing costs + car + cards ≈ 3% of balance + loans + support) ÷ gross income

Here are the thresholds in force in Quebec in 2026:

Ratio	Guideline	Insured maximum (CMHC)
GDS	≤ 32%	39%
TDS	≤ 40%	44%

Since July 5, 2021, CMHC accepts up to 39% (GDS) and 44% (TDS), provided at least one borrower has a score of at least 600. Your capacity is the lower of the two caps, often the TDS because of debts. (Sources: Financial Consumer Agency of Canada (FCAC) and Ratehub, citing CMHC.)

Action point: compute your two payment caps (39% and 44% of income, minus debts and fixed costs); the lower of the two sets your capacity. To go further, get a mortgage pre-approval.

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The stress test: what rate are you qualified at?

The stress test is a safety cushion imposed by the regulator (OSFI) since January 1, 2018. The rule: the lender doesn't calculate your capacity at your real rate, but at the higher of 5.25% or your contract rate + 2%. It applies to insured and uninsured mortgages.

In 2026, the Bank of Canada policy rate is 2.25% and a 5-year fixed runs around 4.09%. So you're qualified at about 6.09% (4.09% + 2%). The amount you can actually borrow is therefore lower than the posted rate suggests.

One exception since late 2024: the test is dropped for a simple lender switch (a straight switch with no increase in the loan amount).

Action point: always calculate your payment at the stress-test rate, never the posted rate.

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A full worked example: a Quebec couple in 2026

Take a couple on Montreal's South Shore with good credit and an insured mortgage. The amounts below are realistic assumptions for 2026: replace them with your real figures.

1. Combined gross income (before taxes): $95,000/year, or $7,917/month.
2. GDS cap (39%): $7,917 × 0.39 = $3,088/month for housing costs.
3. TDS cap (44%): $7,917 × 0.44 = $3,483/month for debts + housing.
4. Monthly debts: car $350 + card (3% of $4,000 = $120) = $470. Fixed housing costs (excluding mortgage): taxes $300 + heating $150 = $450.
5. Available principal and interest:
   • via GDS: $3,088 − $450 = $2,638;
   • via TDS: $3,483 − $470 − $450 = $2,563. We keep the lower: $2,563/month (here, the TDS binds because of the debts).
6. Stress test: with a prudent contract rate of 4.29% (a notch above the ≈ 4.09% seen in the market in 2026), qualification lands at 6.29%. A payment of $2,563 over 25 years at that rate finances a loan of about $387,000 (converting a payment into principal uses the standard amortization formula; our calculator does it for you).

At the posted rate (4.29%), the same payment would have carried ~$471,000: the stress test therefore cuts about $84,000. With a 30-year amortization (first-time buyer), the loan climbs to ≈ $414,500 (+$27,000).

Action point: enter your figures; the borrowing capacity calculator applies the GDS, the TDS and the stress test for you.

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What income do you need to borrow $300,000 or $400,000?

You can also reason in reverse: start from the loan you want, compute the payment at the stress-test rate (6.29%, 25 years), then back out the income via the GDS (39%), using the example's fixed costs (taxes $300 + heating $150). With no other debts:

Amount borrowed	Payment (principal + interest)	Gross income required
$300,000	≈ $1,986/month	≈ $75,000/year
$400,000	≈ $2,649/month	≈ $95,000/year

Every monthly debt increases the income required, via the TDS. A car loan of $400/month alone requires about $11,000 more in gross income ($400 ÷ 0.44 × 12 = $10,909).

Action point: work out the income required for your target price, then add ≈ $11,000 of income for every $400/month of existing debt. If you're cutting it close, paying off a debt works faster than waiting for a raise.

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How a plex's rental income boosts your capacity

For a plex (duplex, triplex, fourplex), the lender adds a percentage of the rents to your eligible income, using either the "rent add-back" or the "expense offset" method depending on the institution. Your borrowing capacity goes up.

Better still: a plex you live in requires a smaller down payment. The scale: 5% for an owner-occupied duplex (on the first $500,000), 10% for an owner-occupied triplex or fourplex, 20% for a non-owner-occupied rental. Example: an owner-occupied $600,000 duplex needs 5% × $500,000 + 10% × $100,000 = $35,000.

You can draw on the FHSA (First Home Savings Account, up to $40,000) and the HBP (Home Buyers' Plan, up to $60,000 from your RRSP), which can be combined.

Action point: for a plex, factor in projected rents; they raise your capacity and lower the down payment. Also ask your broker which method your lender uses (rent add-back or expense offset): for the same rents, the capacity you get changes from one lender to the next. Estimate them with the rental yield calculator.

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Down payment, amortization, insured cap: what changes your capacity in 2026

Three recent rules apply in 2026:

• Minimum down payment: 5% on the first $500,000, 10% on the portion from $500,000 to $1,500,000, 20% from $1.5M (no mortgage insurance available at that price).
• Insured amortization: 25 years by default, but 30 years for first-time buyers (any property type) and new builds, since December 15, 2024. Going from 25 to 30 years lowers the payment by about 8.9%, so more capacity but more interest overall.
• Insured cap: raised from $1M to $1.5M on December 15, 2024 (first increase since 2012). (Source: Canada Gazette.)

Action point: check whether you qualify for the 30-year option, which raises your capacity with no income increase. Simulate the effect with the mortgage calculator.

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Boosting your borrowing capacity: 5 concrete levers

1. Pay off or close high-payment debts (car, card balances): this frees capacity faster than a raise, through a direct effect on the TDS.
2. Lower your card limits: the lender often counts 3% of the limit, not just the balance.
3. Extend the amortization to 30 years, if you qualify: −8.9% on the payment.
4. Add a co-borrower: incomes combine (score of at least 600).
5. Bring in rental income (plex) or increase your down payment.

Action point: before shopping, lower your TDS. It's the fastest lever.

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Common mistakes

1. Confusing borrowing capacity with a prudent budget: the lender's number is a maximum, not a target.
2. Ignoring the stress test: the amount you can access is lower than expected.
3. Forgetting Quebec housing costs: municipal and school taxes + heating inflate the GDS and the TDS.
4. Underestimating cards and lines of credit: they count for ≈ 3% of the balance (or the limit).
5. Using a French (euro) or American (dollar) simulator: those rules don't apply in Quebec.
6. Believing all income counts at 100%: bonuses, commissions and rental income are weighted or averaged.
7. Neglecting a plex's rental income: it's a major, often-forgotten lever.

Action point: qualify yourself at the stress-test rate and count your school taxes, otherwise your DIY math overstates the amount. When in doubt, confirm with a mortgage pre-approval.

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In short, your borrowing capacity is your income reined in by the GDS/TDS ratios and the stress test; a plex's rents push it up. Test your buying scenario in the borrowing capacity calculator before you start shopping.

Transparency and updates. The example's income and debts are realistic assumptions for 2026, to be replaced with your real figures. The GDS/TDS thresholds, the qualifying rate and income weighting vary by lender, your credit score and the product. The rules and figures cited are in force in June 2026; confirm your specific case with a broker or our calculators before submitting an offer.

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Sources: CMHC (insured 39/44 thresholds, stress test); Ratehub (GDS and TDS ratios, components, 30-year amortization); nesto (GDS/TDS calculation, credit-score matrix, cards ≈ 3%); hypotheques.ca (definition, 5 ingredients); WOWA (capacity = the minimum of the caps, 2026 CMHC rules); jsimard.ca (plex financing, 5/10/20% down payments, FHSA/HBP); Canada Gazette (insured cap $1.5M and 30-year amortization).

About WiseRock

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