If you are in U.S., you should be careful about the TAX. If you are a business owner, that means you run a piece of business (even if it is a hobby). Naturally it will generate some capital gain or loss. You need to report this to the IRS in your annual tax return. Fail to do so may subject to the future IRS' auditing. Do not play small money while catch a big fire.
Running a business also means you need to register it with the City, sometimes County or State. You need to fill out quite a few forms and pay some fees. Then you'll be issued a business licence. Running a business without a licence is illegal, especially if you claim some capital loss in your annual tax return.
