online seller need to pay tax?

來源: 於 2007-04-01 09:37:31 [舊帖] [給我悄悄話] 本文已被閱讀：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.