Home office deduction (self-employed Canadians)
Available to self-employed people filing T2125 — not employees (employee home-office rules and the COVID-era flat-rate $2/day method ended after 2022). Done properly, it is one of the largest deductions a sole proprietor can claim.
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Guidance, not advice. We explain the rules, we don't assess your situation. Always seek financial or tax advice from your accountant, or contact CRA. Read our editorial scope →
1. Eligibility (ITA s.18(12))
You qualify in one of two ways:
- The home is your principal place of business; or
- The space is used exclusively and regularly for business and on a regular and continuous basis to meet clients, customers, or patients.
The temporary flat-rate $2/day method introduced during COVID is not available for 2023 onward. Self-employed people use the detailed method.
2. Calculating the business-use percentage
- Square-foot method: office area ÷ total finished home area.
- Room-count method: rooms used for business ÷ total rooms (rooms must be roughly comparable size).
- Time adjustment for shared-use space: area % × (business hours ÷ 24).
Example: 13.3% of the floor area × 60% of the time the room is used for business = 8.0% effective business-use rate.
3. Eligible expenses
- Renters and owners: heat, electricity, utilities, home insurance, rent, maintenance, condo fees, internet (prorated by personal/business use).
- Owners only: mortgage interest (not principal) and property taxes.
- Not deductible: mortgage principal, capital improvements to the home, anything not reasonably attributable to the workspace.
4. The loss limitation — s.18(12)
Home-office expenses cannot create or increase a business loss. Any amount disallowed carries forward indefinitely and can be claimed in a future year when business income is high enough.
Strategy: claim other deductions (vehicle, supplies, CCA on equipment) first because those can create losses. Apply home-office last, against remaining positive income.
5. Why most accountants advise against CCA on the home
- Claiming CCA on the home risks recapture on sale (s.13(1)) as ordinary income.
- It can compromise the principal residence exemption for the business-use portion.
- The annual deduction is usually small; the recapture exposure is large.
6. Toronto homeowner worksheet ($80k income)
1,100 sq ft condo, 130 sq ft office = 11.8% business-use.
| Expense | Annual | ×% | Deduction |
|---|---|---|---|
| Mortgage interest | $18,000 | 11.8% | $2,124 |
| Property tax | $5,200 | 11.8% | $614 |
| Condo fees | $6,000 | 11.8% | $708 |
| Utilities | $2,400 | 11.8% | $283 |
| Home insurance | $1,200 | 11.8% | $142 |
| Internet | $1,200 | 70% | $840 |
| Total | $4,711 | ||
Tax saving ≈ $1,649 at a 35% marginal rate.
7. Vancouver renter worksheet ($50k income)
750 sq ft apt, 100 sq ft workspace, 60% time use = 8.0% effective.
| Expense | Annual | ×% | Deduction |
|---|---|---|---|
| Rent | $24,000 | 8% | $1,920 |
| Utilities | $1,800 | 8% | $144 |
| Tenant insurance | $600 | 8% | $48 |
| Internet | $960 | 50% | $480 |
| Total | $2,592 | ||
Tax saving ≈ $778 at a 30% marginal rate.
8. Audit triggers
- Business-use % above 25–30% without exceptional supporting evidence.
- Claiming 100% of internet or phone.
- Using home-office expenses to create or deepen a business loss.
- Missing mortgage statements, property-tax bills, or utility records.
9. T2125 Part 7 reporting
- Line 9945: total business-use-of-home expenses before applying the loss limitation.
- Line 9790: net business income after the home-office adjustment.
- Do not duplicate expenses — items entered in the home-office section are excluded from the general expense section.
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