online seller need to pay tax?

来源: hxm 于 2007-04-01 09:37:31 [] [旧帖] [给我悄悄话] 阅读数 : (184 bytes)

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.

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