As per our TurboTax article: The Beginner’s Guide to Self-Employed Taxes: When you’re an employee, you get a T4 slip from your employer, and taxes are deducted from each paycheck. When you’re self-employed there’s no employer to deduct taxes from your pay, so you make your own estimated tax payments each quarter and can deduct business expenses related to your work.
Self-employment income does not go on a T4 slip. If your self-employment is already included in your T4, this does not allow for self-employment expenses to be declared as that income will not be declared in the self-employment income section as it would be declared twice.
For more information please see our TurboTax article You May Have Business Income and Not Even Know It!
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