When does a hobby become a small business?

So, I am a guy that publishes things for profit. I have gotten my writing published professionally through publishers, of course, but I was thinking of starting to do work as an art-publisher. Sort of small runs of my works and other people's works financed by me. I have set up a mailing address (not a store... show more So, I am a guy that publishes things for profit. I have gotten my writing published professionally through publishers, of course, but I was thinking of starting to do work as an art-publisher. Sort of small runs of my works and other people's works financed by me. I have set up a mailing address (not a store front or anything), a website, and things like that. I am not expecting to actually make any money, though. Sort of a hobby, and sort of for appreciation of the work rather than thinking any long term things or having employees or anything like that. This is a very realistic concept of how this is going to play out. My question is, when does a hobby become a small business? When would I have to register it and get a tax id? Is there any point to doing that? Can I just name my business and go from there, just sell my stuff like I am having a yard sale, sort of? Of course, i would be claiming net gains and losses on my taxes like I should, but I was just wondering about when I should actually go through the trouble of registering it and everything, if ever. Everything I have read seems to suggest that I need to have employees, a certain amount of income, etc, but nothing like "Well, if you plan on your business failing, it is no big deal to even go to the trouble of registering it." Thanks a lot!
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