I do not wish to submit any additional documentation or complete a new IRS Form W-8. What will happen if I do not respond?

It is imperative you respond to the email request with appropriate documentation. Failure to do so may result in exceptional U.S. tax withholding being imposed on your account, reporting of your account to tax authorities and other remedial measures.

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Why do I need to provide documents that I already gave to IBKR?
FATCA FAQs - General
Where should I send my completed Form 8-3-6?
I am not a U.S. taxpayer. Why do I have to submit IRS Form W-8?