Last I was told, been some time now, $500 was the hobby threshold. Better check though.
As I understand it, if you keep it separate then the question is "where does the money go? " well of course you get paid from that so now you're probably looking at self employed and the appropriate taxes, which at last peek for me was double being an employee. If you're an employee then the entity has even more taxes, and that doesn't even take into account other government agencies wanting their cut.
Keep apprised of your findings.