online seller need to pay tax?

来源: 于 2007-04-01 09:37:31 [旧帖] [给我悄悄话] 本文已被阅读：次

I sell books online some time and can make 2-4 thousands/year.
Do I need to pay tax? How can I do it?
IF they will check me when I apply my green card?
thanks you very much.