A past manager once gave me great advice for situations like these when I was thinking about applying to grad school worrying about my then-job if I got in: "deal with this problem if you get in." The chances of you making a few hundred dollars in revenue by next Spring are statistically very low. And if you are persistent and talented and lucky enough to generate hundreds of dollars in revenue, you're certainly capable of paying taxes on your earnings.
The fact that you're asking this question means you're interested in launching things. If so, the cliched, true advice is: launch.
If you want practical advice: I run a one-person LLC in the US. Taxes on a few hundred dollars are nothing to worry about.
For inevitable naysayers: my manager's advice doesn't mean you shouldn't ever plan or prepare. Just that when your chances of success are very low, don't worry too much about the repercussions of success. I applied to grad school, and didn't get in. My career continued on just fine.
The fact that you're asking this question means you're interested in launching things. If so, the cliched, true advice is: launch.
If you want practical advice: I run a one-person LLC in the US. Taxes on a few hundred dollars are nothing to worry about.
For inevitable naysayers: my manager's advice doesn't mean you shouldn't ever plan or prepare. Just that when your chances of success are very low, don't worry too much about the repercussions of success. I applied to grad school, and didn't get in. My career continued on just fine.