W-8BEN里的reference number填什么啊？

救助！W-8ben中Reference number(s)国人该怎么填？

还有第三部分的，I have provided or will provide a statement that identifies those notional principal contracts from which the income is not effectively
connected with the conduct of a trade or business in the United States. I agree to update this statement as required.
要打钩嘛？

W-8BEN中的Reference number(s) 是你再该券商的帐号，如果是新申请还没开通可以不填的。

以后每两年更新W-8BEN时候填上就行。