Net self-employment income is the number the CRA taxes — your gross business revenue minus all allowable deductions. Here is how to calculate it correctly using Form T2125, and what the result means for your tax return.
The Formula
Gross Business Revenue - Cost of Goods Sold (if applicable) = Gross Profit - Allowable Business Expenses - Business-Use-of-Home Expenses - CCA (Capital Cost Allowance) = Net Income from Business (T2125 line 9946)
This net income figure from T2125 flows into your personal T1 tax return at Line 13500 (net self-employment income) and is added to your other income sources to determine your total taxable income.
Step 1: Calculate Gross Revenue
Gross revenue is all income you received from clients for business activities. Include:
- All client payments received during the calendar year
- Barter income at fair market value
- Grants or subsidies received for the business
Do not include:
- GST/HST collected from clients (if registered — this is a liability, not income)
- Loans or personal money put into the business
- Capital asset sales (handled separately)
Step 2: Subtract Allowable Expenses
Subtract all business expenses documented and categorized on T2125 Part 4. Common categories include advertising, software, professional fees, insurance, bank charges, and professional development. Keep every receipt.
After subtracting all operating expenses, you get your net income before home office and CCA deductions.
Step 3: Apply Home Office Deduction
If you have a qualifying home office, subtract the calculated home office deduction (from T2125 Part 7). Remember: this cannot create a net business loss — any excess carries forward.
Step 4: Subtract CCA
If you purchased business assets (computer, equipment, furniture) that qualify for Capital Cost Allowance, apply the CCA deduction from Part 8 of T2125. CCA is optional — you can choose to claim less than the maximum if preserving income for RRSP room purposes.
What Your Net Income Affects
Your net self-employment income drives several calculations:
- Income tax: Added to all other income and taxed at your marginal rate
- CPP contributions: You pay 11.9% on net self-employment income between $3,500 (basic exemption) and $74,600 (YMPE 2026), maximum $8,460.90 for 2026. CPP2 applies on earnings between $74,600 and $85,000 at 8%, maximum $832.
- RRSP contribution room: 18% of your prior year’s “earned income,” which includes net self-employment income. $75,000 net self-employment income = $13,500 in new RRSP room for the following year (subject to the annual limit, $33,810 in 2026).
- Instalment requirements: If net tax owing (income tax + CPP) exceeds $3,000 two years running, quarterly instalments are required
Example Calculation (Ontario Freelancer, 2025 tax year)
| Item | Amount |
|---|---|
| Gross revenue | $85,000 |
| Software subscriptions | -$2,400 |
| Home office (10% of $18,000 home costs) | -$1,800 |
| Professional fees (accountant) | -$800 |
| Internet (50%) | -$600 |
| Professional development | -$1,200 |
| Laptop CCA (30% of $2,400 cost × 50% half-year) | -$360 |
| Net self-employment income | $77,840 |
Frequently Asked Questions
Can I have a net business loss?
Yes. If your allowable expenses exceed your gross revenue (excluding home office), the result is a net business loss. Losses from self-employment can be deducted against other income on your T1 (such as employment income), reducing your overall tax. The CRA may challenge losses that persist for several consecutive years — they may classify the activity as a “hobby” rather than a business with a reasonable expectation of profit.
Does my net self-employment income affect my GST/HST return?
No directly — GST/HST is based on your gross taxable supplies, not net income. However, the two are related: if your gross revenue is below $30,000, you may not need a GST/HST registration at all. Your net income (after expenses) is what you pay income tax and CPP on.
How does earning less through expenses affect RRSP room?
RRSP room is based on earned income, not taxable income. Your net self-employment income (after expenses, before CCA in some interpretations) is earned income for RRSP purposes. Higher expenses reduce your earned income, reducing the RRSP room you generate. If RRSP room is important to you, factor this in before claiming every possible deduction.