Anyone can junp in here and correct me if I am wrong, but we get W-8s on all non-resident aliens, interest-bearing or not.
The rules say we need a TIN for every deposit account opened. The W-8 shows that the account belongs to a NRA and therefore there may not be a TIN (so we don't get fined for not having one). Besides, the NRA may open a non-interest bearing DDA today, but next month may change their mind and want a NOW account - is someone going to remember to get a W-8 at that point? By getting one up front, no one has to remember later on "did we get one already or not?"
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'Never' is karma's doorbell.
Ding ding!
It's for you. . . .