W-8BEN vs W-9 is decided by status, not address. A US citizen living in Britain is still a US person and gives Form W-9, even to a UK bank; Form W-8BEN certifies foreign status and is for non-US persons only. Signing the wrong one misstates your status to a financial institution. Cross-border taxation starts with getting this right.
The forms arrive without explanation — from a UK bank opening an account, a US broker reviewing a file, or a client's accounts department before paying an invoice. Choosing by where you live rather than what you are is the mistake that follows people for years.
W-8BEN vs W-9: which form applies
| Form W-9 | Form W-8BEN | |
|---|---|---|
| Who signs it | US persons: citizens, Green Card holders, US residents | Non-US individuals only |
| What it certifies | Your correct taxpayer identification number | Foreign status as beneficial owner |
| Number given | SSN or ITIN | Foreign tax number, sometimes a US ITIN |
| Treaty claim | Not applicable | Yes, for reduced withholding |
| Default withholding if unsigned | 24% backup withholding | 30% on US-source income |
| Where it goes | To the payer; never to the IRS | To the withholding agent; never to the IRS |
The IRS describes Form W-9 as the way to give your correct taxpayer identification number to a person who must file an information return, and Form W-8BEN as the certificate of foreign status of beneficial owner, used by foreign individuals to claim reduced treaty withholding.
Why US citizens abroad cannot use W-8BEN
US citizenship makes you a US person for tax purposes wherever you live. A W-8BEN signed by a US citizen certifies something untrue, and it is signed under penalties of perjury.
It also backfires practically. The form tells the payer to treat you as foreign, which can mean 30% withholding on US-source income and accounts flagged incorrectly. Correcting it later means explaining why you certified foreign status while holding a US passport.
The same logic applies to an accidental American — someone born in the United States who left as a child, or who inherited citizenship from a parent. Citizenship is a matter of fact rather than choice, so the W-9 is still the correct form until that status is formally relinquished, which is its own process with its own tax consequences.
What your UK bank is actually asking
UK banks collect self-certification under FATCA and the Common Reporting Standard. They ask where you are tax resident and whether you are a US person, and if you are, they ask for a W-9 and report the account to HMRC, which passes it to the IRS.
Answering honestly changes nothing about your UK tax. It does mean your UK accounts are visible to the IRS, which is why the FBAR and Form 8938 positions need to match — see FBAR versus Form 8938.
Some UK banks and platforms decline US persons rather than carry the reporting burden. That is a commercial choice, not a tax rule, and it is not a reason to answer the question differently.
Backup withholding
If a US payer has no valid W-9 from you, it must apply backup withholding at 24%, as the IRS explains on its backup withholding page. That is withheld on gross payments and recovered only by filing a return.
The withholding is not a tax in itself — it is a deposit against your eventual liability, credited on your return like any other withholding. But it is taken from gross payments rather than profit, so a freelancer withheld at 24% on turnover can easily have more held back than their whole US tax bill for the year, and then wait until the refund arrives.
For a freelancer invoicing US clients from Britain, this is the practical risk: no W-9 on file, 24% held back from every payment, and a year's wait to reclaim it. The income is foreign earned income because of where you work, as covered in working remotely for a US company from the UK.
Which form in which situation
- US citizen in the UK, UK bank account: W-9 to the bank, with your SSN.
- US citizen in the UK, US brokerage: W-9; a US address is not required to keep the account, though some brokers insist on one.
- US citizen freelancing for US clients: W-9 to each client before invoicing.
- British spouse with no US status: W-8BEN, claiming treaty rates on US dividends.
- UK company invoicing a US client: Form W-8BEN-E, the entity version, not W-8BEN.
- Green Card holder in the UK: W-9; a Green Card makes you a US person even while abroad.
Forms also go stale. A W-8BEN generally expires at the end of the third calendar year after it is signed, and both forms must be replaced when the facts change — a new address, a new name after marriage, or a change of status such as receiving a Green Card. A payer working from an expired or inaccurate certificate will usually default to withholding until a fresh one arrives.
A non-US spouse's W-8BEN and your W-9 can sit side by side on a joint account, each certifying their own status. Where that spouse's income is brought onto a US return by election, the position changes — see married to a non-US citizen.
Tranzesta reviews the forms on file for clients and their businesses before they cause withholding problems. Book a consultation if you are not sure what you signed. The return itself is covered under US expat tax returns.
Frequently Asked Questions
Should a US citizen living in the UK sign W-8BEN or W-9?
Form W-9. US citizens remain US persons for tax purposes regardless of where they live, so they certify their taxpayer identification number on Form W-9. Form W-8BEN certifies foreign status and is only for non-US individuals, so signing it as a US citizen misstates your status under penalties of perjury.
Why does my UK bank want a W-9?
Because of FATCA. UK financial institutions must identify US persons among their customers, collect a self-certification and US taxpayer identification number, and report those accounts to HMRC, which exchanges the information with the IRS. Providing the W-9 does not change your UK tax position.
What happens if I do not give a W-9 to a US payer?
The payer must apply backup withholding at 24% on reportable payments. The money is withheld from gross amounts and can only be recovered by claiming it on a US tax return, so a missing form turns into a cash-flow problem for a year or more.
Can my non-American spouse sign a W-8BEN?
Yes, if they are not a US person. A W-8BEN certifies their foreign status and can claim treaty benefits, such as the reduced rate of US withholding tax on dividends. It becomes inappropriate if you elect to treat them as a US resident for income tax purposes, which makes them a US person for these forms.
Which form does a UK limited company use?
Form W-8BEN-E, the entity version of the certificate of foreign status, is given to US customers or withholding agents. Form W-8BEN is for individuals only, and Form W-9 would be wrong unless the entity is a US person, for example a US LLC.
Does an American in Dubai use the same form?
Yes, Form W-9. Status follows citizenship, not residence, so a US citizen living in the UAE gives a W-9 to banks and payers. With no US–UAE income tax treaty, there would be no treaty rate to claim on a W-8BEN even if it were available.
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