What Interactive Brokers says about the W-8BEN form
Almost everything written about this form is written about you — your residence, your treaty, your return. This page is written about the broker: what Interactive Brokers Ireland Limited (Ireland, Central Bank of Ireland C423427) states in its own documents about taking the form and withholding at source. That is the part that can be verified, and the part that differs between brokers.
Which entity this covers
Read off the tax pages published on the Irish domain, whose footer names Interactive Brokers Ireland Limited. The pages themselves write "IBKR" throughout rather than naming the entity in the sentences quoted here, and the step-by-step filing instructions come from the group-wide Client Portal guide rather than an Ireland-specific page. No paper route is described anywhere on those pages.
What this page does not answer
Not what you will pay, not which treaty rate applies to you, and not what to put on your own tax return. Those depend on where you are resident and on the agreement between your country and the United States — questions a broker's documents cannot settle and we hold no source for. Everything below is a statement by the broker about the broker.
Does Interactive Brokers take a W-8BEN form?
Yes, and inside the account. Interactive Brokers Ireland Limited (Ireland, Central Bank of Ireland C423427) takes the form electronically during onboarding or from the account area, with no paper and no posting.
“Account holders who are neither a legal resident nor citizen of the U.S. can fill out or update IRS Form W-8. To update tax forms: Click the User menu > Settings > Account Profile, click Profile, click the edit icon to the right of the entity, click Tax Forms.”
Does Interactive Brokers withhold US tax at source?
Interactive Brokers Ireland Limited (Ireland, Central Bank of Ireland C423427) states that it withholds US tax at source. The deduction happens before the money reaches your account, so the amount you see credited is already net of it.
“If the form W-8 is no longer valid, IBKR will assume that you are a non-US person and withhold US tax at 30% on interest, dividends, gross proceeds and payments and lieu. Treaty rates, if applicable, will no longer apply.”
What US dividend withholding rate does Interactive Brokers name in its documents?
30% — that is the figure Interactive Brokers Ireland Limited (Ireland, Central Bank of Ireland C423427) names in its own documents, quoted in full below. It is what the broker publishes, not a calculation of what applies to you.
“Generally, tax is withheld at a rate of 30% on payments of US source stock dividends and substitute payments in lieu. The rate of withholding may be reduced if there is a tax treaty between your country of tax residence and the US.”
How long does a W-8BEN stay valid at Interactive Brokers?
Interactive Brokers Ireland Limited (Ireland, Central Bank of Ireland C423427) states a validity period for the form, in its own words below. When it lapses, the form has to be filed again.
“Forms W-8 are valid for the year in which they are signed and for the next three calendar years. For example, a Form W-8BEN signed on March 5, 2018, remains valid through December 31, 2021, and must be resubmitted to IBKR no later than January 30, 2022.”
Verified 2026-09-08 · Source document
Frequently asked questions
Does Interactive Brokers take a W-8BEN form?
Does Interactive Brokers withhold US tax at source?
What US dividend withholding rate does Interactive Brokers name in its documents?
How long does a W-8BEN stay valid at Interactive Brokers?
How we verified this review
Every fact below is verified against primary sources. We refresh on a schedule and on reader feedback.