# How Much Mortgage Can You Actually Afford on Your Salaried Income in Canada

> GDS/TDS ratios, the stress test, and three worked income points ($80k/$100k/$130k) show exactly how much mortgage a salaried Canadian borrower qualifies for in 2025-2026.

Category: Qualification
Last verified: 2026-04-20
Source: https://ratellow.com/scenarios/how-much-mortgage-can-i-afford-income-canada

## Who this is for
Salaried T4 employees — single or dual-income households — who want a precise, mechanics-level answer to how much mortgage their gross income supports before they start shopping.

## Summary
Canadian mortgage affordability is governed by two debt-service ratios — GDS (housing costs as a share of gross income) and TDS (all debt as a share of gross income) — applied to a stress-test qualifying rate that sits roughly 200 bps above your contract rate. At a 5.25% 5-year fixed contract rate, the stress-test rate is 7.25% (the greater of contract + 2% and the 5.25% regulatory floor). Under those mechanics, a salaried borrower with no other debt qualifies for roughly 4.0–4.5× gross income in mortgage principal, with the exact multiple depending on property taxes, heat, condo fees, and amortization. The three income-point worked examples below use identical assumptions throughout so the numbers reconcile precisely.

## Worked example
Baseline assumptions used consistently across all three income points: qualifying rate 7.25% (stress test on a 5.25% 5-year fixed contract rate), 30-year amortization (insured first-time buyer eligible under the December 2024 reform allowing 30-year amortization on insured purchases for FTHBs), property tax $4,500/year ($375/month), heat $150/month, no condo fee, no existing debt (car loan, student loan, or revolving balance). GDS ceiling 39%, TDS ceiling 44% per CMHC insured guidelines. The binding constraint in all three cases is TDS at 44% because there is no other debt — if other debt exists, TDS tightens first.

- Stress-test qualifying rate: 7.25% (contract 5.25% + 2.00%)
- Amortization assumed: 30 years (insured FTHB post-Dec 2024 reform)
- Fixed monthly non-mortgage housing costs: $525/mo ($375 tax + $150 heat)
- GDS / TDS ceilings (insured): 39% GDS / 44% TDS
- Resulting mortgage multiple (no other debt): ~4.2–4.4× gross annual income

## Framework
### The GDS/TDS mechanics — how the ratios actually work
**GDS (Gross Debt Service ratio)** = (monthly mortgage payment + property tax + heat + 50% of condo fees) ÷ gross monthly income. The CMHC insured ceiling is 39%; conventional uninsured lenders typically hold the same ceiling under B-20.

**TDS (Total Debt Service ratio)** = GDS numerator + all other monthly debt obligations (car loans, student loans, minimum credit-card payments, lines of credit) ÷ gross monthly income. Insured ceiling is 44%; conventional lenders typically apply 44% as well, though some lenders permit up to 50% TDS on strong-credit uninsured files.

The mortgage payment in both ratios is calculated at the **stress-test qualifying rate** — currently 7.25% for a 5.25% contract rate — not the actual contract rate. This is the mechanism that compresses affordability relative to the payment you will actually make. OSFI Guideline B-20 mandates this for all federally regulated lenders.

### Three income points — $80k, $100k, $130k gross annual
All three use: 7.25% qualifying rate, 30-year amortization, $375/mo property tax, $150/mo heat, $0 condo fee, $0 other debt. TDS ceiling 44% is the binding constraint.

**$80,000 gross income**
- Max monthly debt service at 44% TDS: $80,000 ÷ 12 × 0.44 = $2,933/mo
- Less fixed housing costs ($525/mo): $2,408/mo available for mortgage payment
- Mortgage principal supportable at 7.25% / 30-yr: ~$340,000
- Approximate purchase price at 5% down (insured): ~$358,000

**$100,000 gross income**
- Max monthly debt service: $100,000 ÷ 12 × 0.44 = $3,667/mo
- Less $525/mo: $3,142/mo available for mortgage payment
- Mortgage principal: ~$444,000
- Approximate purchase price at 5% down: ~$467,000

**$130,000 gross income**
- Max monthly debt service: $130,000 ÷ 12 × 0.44 = $4,767/mo
- Less $525/mo: $4,242/mo available for mortgage payment
- Mortgage principal: ~$599,000
- Approximate purchase price at 5% down: ~$630,000 (note: insured cap is $1.5M post-Dec 2024; 5% down applies to first $500k, 10% on the remainder)

All mortgage principal figures are derived from a standard present-value calculation at 7.25% semi-annual compounding (Canadian mortgage convention), 360 payments. A reader can verify each figure independently using any amortization calculator with those exact inputs.

### How the stress test compresses your number — and what changes it
At a 7.25% qualifying rate versus the 5.25% contract rate, the monthly payment on a $444,000 mortgage over 30 years is approximately $3,142 (qualifying) versus $2,440 (actual). That ~$700/month gap is the stress-test buffer — it is not money you pay, it is headroom the lender is reserving against rate increases.

Four variables move your qualifying mortgage materially:
1. **Amortization**: 25-year vs. 30-year changes the qualifying payment by roughly 10–12%, which shifts the principal you qualify for by the same proportion. The 30-year option is only available on insured mortgages for FTHBs post-December 2024 reform; conventional uninsured mortgages remain capped at 25 years for qualification purposes at most lenders.
2. **Other debt**: A $500/month car loan reduces TDS headroom by $500, cutting qualifying mortgage principal by roughly $70,000–$75,000 at these rate levels.
3. **Condo fees**: 50% of the monthly condo fee is included in GDS. A $600/month condo fee adds $300 to the GDS numerator, reducing qualifying principal by approximately $42,000.
4. **Property tax**: Higher-tax municipalities (e.g., some Ontario cities with effective rates above 1.2%) reduce qualifying principal dollar-for-dollar in the GDS numerator.

### T4 income documentation — how salaried income is verified and what counts
For straightforward T4 employment, lenders require: most recent T4, most recent two pay stubs, and a letter of employment confirming position, tenure, and salary. The qualifying income is the base salary on the letter of employment — this is the cleanest input.

**Variable pay components require separate treatment:**
- **Overtime and shift premiums**: Most federally regulated lenders require a 2-year average from T4s and will include 100% of the 2-year average. Some monoline lenders apply a 50% haircut to overtime unless it is contractually guaranteed.
- **Annual bonus**: Treated as a 2-year average of T4 box 14 minus base salary. Inclusion rates vary — major banks typically include 100% of the 2-year average; some lenders cap bonus inclusion at 25–50% of base salary regardless of history.
- **Commission income on a T4**: Treated similarly to bonus — 2-year average required. A borrower in their first year of a commission role typically cannot use commission income at all.

The practical implication: if your qualifying income includes significant variable pay, confirm the lender's inclusion policy before submitting. A $20,000 annual bonus included at 50% vs. 100% changes qualifying income by $10,000, which shifts maximum mortgage by roughly $40,000–$45,000.

### Insured vs. conventional — how the down payment changes the ceiling
The December 2024 reforms raised the insured mortgage cap from $1.0M to $1.5M, meaningfully expanding the insured route for borrowers in high-cost markets. The insured path (CMHC, Sagen, or Canada Guaranty) carries a premium — 4.00% on 5–9.99% down, 3.10% on 10–14.99%, 2.80% on 15–19.99% — added to the mortgage principal. The conventional (uninsured) path requires 20% down and eliminates the premium but restricts amortization to 25 years for qualification purposes at most lenders, which reduces qualifying principal.

For a $100k income borrower: insured at 5% down with 30-year amortization qualifies for ~$444k principal; conventional at 20% down with 25-year amortization qualifies for roughly $400k principal at the same stress-test rate. The insured route produces a higher qualifying mortgage despite the premium cost — the amortization extension is the dominant variable. Whether the premium cost is worth it depends on your down payment availability and hold period.

### What the ratio ceilings do not capture — the affordability gap
TDS at 44% means 44 cents of every gross income dollar goes to debt service. After income tax, CPP, and EI, a $100k gross earner in Ontario takes home roughly $72,000–$74,000 net annually (~$6,100/month). A TDS-maximum mortgage consumes $3,667/month of gross income — but the actual mortgage payment at the contract rate of 5.25% on $444k over 30 years is approximately $2,440/month, which is 40% of net income. Add property tax and heat and total housing costs reach roughly $3,000/month, or ~49% of net take-home.

Most financial planning frameworks suggest housing costs below 35% of net income for long-term sustainability. The regulatory TDS ceiling is a qualification floor, not a budgeting recommendation. Borrowers who qualify at the ceiling are not necessarily in a comfortable position — they are at the regulatory maximum, which is a different thing.

## Key considerations
- The stress-test qualifying rate resets with every rate environment. At a 4.50% contract rate, the stress test drops to 6.50% (contract + 2%), and qualifying principal rises by roughly 8–10% for the same income. Tracking the contract rate environment matters as much as tracking your income.
- Dual-income households can combine gross incomes for GDS/TDS purposes, but both borrowers' debts are also combined. A household earning $160k combined with $800/month in combined car loans qualifies for less than a single-income $160k earner with no debt.
- T4 salaried borrowers on probation (typically the first 3–6 months of a new role) are treated inconsistently across lenders. Some require the probationary period to be complete before funding; others accept a letter of employment confirming permanent status post-probation. Confirm this before making an offer.
- Property tax estimates used in pre-qualification are often based on the current assessed value, not the purchase price. In municipalities where assessed values lag market values significantly, actual post-purchase property taxes may be higher, tightening your real-world GDS.
- The $1.5M insured cap introduced in December 2024 applies to the purchase price, not the mortgage amount. A $1.5M purchase with 5% down produces a $1.425M insured mortgage plus a 4.00% CMHC premium ($57,000), for a total insured mortgage of $1.482M. Confirm your lender accepts insured mortgages at this size — not all do.
- Rental income from a suite or accessory dwelling unit can offset GDS/TDS under CMHC's rental offset rules, but the property must meet lender and municipal zoning requirements. For salaried borrowers stretching to qualify, a legal secondary suite can add meaningful qualifying room.

## Common mistakes
- Using the contract rate instead of the stress-test rate to estimate qualifying mortgage — this overstates your qualifying principal by 15–20% and leads to offers on properties you cannot actually finance.
- Ignoring condo fees when sizing affordability for a condo purchase — a $700/month condo fee adds $350 to the GDS numerator, reducing qualifying principal by roughly $49,000 at current stress-test rates.
- Assuming bonus income qualifies at 100% without confirming the lender's inclusion policy — a $30,000 annual bonus included at 50% instead of 100% reduces qualifying income by $15,000 and qualifying mortgage by roughly $60,000.
- Qualifying at the TDS ceiling and treating it as a budget — borrowers who maximize TDS at 44% gross are typically allocating 45–50% of net income to housing costs, leaving limited buffer for maintenance, strata levies, or income disruption.
- Applying for a mortgage while carrying a high credit-card balance — minimum payments (typically 3% of the outstanding balance) are included in TDS. A $15,000 balance generates a $450/month TDS obligation, reducing qualifying mortgage by roughly $63,000.
- Overlooking the amortization difference between insured and conventional paths — borrowers who assume 30-year amortization is available on a conventional (20%+ down) mortgage will find their qualifying principal drops by roughly 10–12% when the lender applies the 25-year standard.

## Action steps
1. Calculate your own GDS and TDS before speaking to a lender: take your gross monthly income, multiply by 0.39 (GDS ceiling) and 0.44 (TDS ceiling), subtract your fixed housing costs ($375 property tax estimate + $150 heat + 50% of any condo fee), and the remainder is your maximum qualifying mortgage payment at the stress-test rate. Use an amortization calculator at 7.25% to convert that payment to a principal amount.
2. Pull your most recent two T4s and two pay stubs and calculate your 2-year average of variable pay (bonus, overtime). Confirm with your broker which lenders include 100% of that average versus applying a haircut — this single variable can shift your qualifying mortgage by $40,000–$80,000.
3. List every monthly debt obligation (car loan, student loan, line of credit minimum, credit card minimum) and subtract the total from your TDS headroom before estimating qualifying mortgage. This is the number that matters, not the GDS-only calculation.
4. If you are a first-time buyer targeting an insured mortgage, confirm you meet the FTHB definition under the Income Tax Act and that your purchase price is at or below $1.5M — both conditions are required to access the 30-year amortization and the insured route simultaneously.
5. Run the numbers at both 25-year and 30-year amortization to understand the qualifying difference. If you are not FTHB-eligible for the 30-year insured option, your qualifying principal drops by roughly 10–12% — factor this into your price range before making offers.
6. Engage a broker with access to both insured and conventional lenders before you have a specific property in mind. Pre-qualification at this stage costs nothing and gives you a defensible number to work from when you do find a property.

## Sources
- Guideline B-20 — Residential Mortgage Underwriting Practices and Procedures — https://www.osfi-bsif.gc.ca/en/guidance/guidance-library/residential-mortgage-underwriting-practices-procedures
- Mortgage Loan Insurance — Homeownership — https://www.cmhc-schl.gc.ca/professionals/project-funding-and-mortgage-financing/mortgage-loan-insurance/mortgage-loan-insurance-homeownership-programs
- Mortgage Qualifier Tool and Affordability Guidance — https://www.fcac-acfc.gc.ca/en/financial-tools/mortgage-qualifier
- Policy Interest Rate — https://www.bankofcanada.ca/core-functions/monetary-policy/key-interest-rate/