Canadian residents earning from US AI training platforms file as self-employed business income via Form T2125. The structure is similar to US but with a few Canadian-specific advantages. Here's the guide.
Basic structure
AI training income is self-employment business income. Reported on Form T2125 (Statement of Business or Professional Activities) attached to your T1 personal return.
You don't need to incorporate. Sole proprietorship is automatic when you earn business income.
Tax rates
Canadian federal + provincial combined marginal rates for 2026:
- Up to ~$55k: ~25–28% combined (varies by province)
- $55k–$110k: ~32–38%
- $110k–$170k: ~38–43%
- $170k+: ~45–53% depending on province
Plus CPP contributions on self-employment income (~10% of net earnings, both employer and employee portions, capped). Plus EI premiums (optional for self-employed).
GST/HST registration threshold
Register when revenue exceeds CAD $30,000 in any rolling 12-month period (lower than most other countries). Once registered:
- Services to non-Canadian clients are zero-rated for GST/HST.
- You can claim Input Tax Credits on Canadian business expenses.
- Quarterly or annual returns required.
The $30k threshold is low — most full-time AI training contractors will cross it. Plan for the registration overhead.
RRSP contributions (the major tax shelter)
Self-employed contractors can contribute up to 18% of earned income (capped at $32,490 for 2026) to an RRSP, deductible against taxable income.
For a senior AI contractor at $130k income: ~$23,400 RRSP contribution, ~$8,400 tax savings at marginal rate. Compounding annually, this is the largest tax-advantaged shelter available.
TFSA contributions
Tax-Free Savings Account contributions ($7,000 in 2026) aren't deductible but grow tax-free and withdrawals are tax-free. Use after RRSP space is exhausted, or if you expect to be in a higher tax bracket later.
Quarterly tax instalments
CRA requires quarterly instalments after your first year as self-employed:
- Mar 15, Jun 15, Sep 15, Dec 15
- Each instalment 25% of expected annual liability
- Missing instalments triggers ~7% interest penalty
Common deductions on T2125
- Home office: Use of home for business — proportional to square footage and time used.
- Capital cost allowance: Equipment depreciation over standard schedule.
- Internet, phone, utilities: Business-use percentage.
- Professional development: Courses and training.
- Health and dental insurance premiums: Eligible for deduction as business expense.
Bottom line
Canadian AI training contractors should: file T2125 with their T1 return, register for GST/HST once over $30k revenue (zero-rated for foreign services), max out RRSP contributions for the largest tax shelter, pay quarterly instalments after year 1, and claim home-office plus equipment deductions. Effective rate at senior contractor income is ~36% combined federal + provincial.