Thank you for your question.
TurboTax could be telling you that he is self-employed because he has income in certain boxes on slips. For example, if he has any amount in box 20 or 48 of a T4A, the CRA says that income would be self-employment income.
Or TurboTax can be showing that he is self-employed if you transferred your information from your 2019 tax return.
For more information, please see the link below:
Why is TurboTax telling me I'm self-employed?
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