Why is my bank asking for w8ben

I'm Mexican living in the US and my bank (Santander) just asked me to file a w8ben form, why is this needed? What happens if I don't give my foreign tax identifying number? Or what happens if I give it?

submitted by /u/Emergency-Chair7364
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source https://www.reddit.com/r/immigration/comments/r6jb1s/why_is_my_bank_asking_for_w8ben/

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