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As per our TurboTax article Your Complete Guide to the T4A Tax Slip
Box 20 – Self Employed Commissions or Box 48 – Fees for Services
If you receive a T4A with Box 20 or Box 48 amounts, you are indeed self-employed for tax purposes as both of these boxes are used exclusively to report self-employment income. You’re either a contractor or you’ve earned income from commission-based activities.
Having a T4A with Box 20 or 48 means that you’re required to complete a bit of extra info at tax time. Since you’re self-employed, you’ll complete the business form T2125 – Statement of Business Activities. The upside is you can also claim expenses to offset that income on that form. More information can be found in this TurboTax article: Guidelines for reporting Self-Employment Income.
For additional information please see our TurboTax article Guidelines for Reporting Self-Employment Income.