If IB does not have a valid Form W-8 on file, you are presumed to be a US person without a proper tax certification and IB is required to backup withhold at a rate of 28% on interest, dividends and payments in lieu, as well as gross proceeds.

Circular 230 Notice: These statements are provided for information purposes only, are not intended to constitute tax advice which may be relied upon to avoid penalties under any federal, state, local or other tax statutes or regulations, and do not resolve any tax issues in your favor.