It depends. Does he regularly receive this commission from the distributor or was it just a one time "Thank You" payment?
Since the distributor is not his employer, if he is working to earn money from the distributor, then this would be included on the Schedule C as self-employment income.
If this was just a one time thank you payment, then you can select Hobby which will just report it as Other income and it will not be subject to Medicare and social security taxes, just regular income taxes. This does not tell the IRS it is hobby income, it just tells TurboTax where to report the income.
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