A W-9 form is a US tax document that a person or business provides to confirm their name, address and taxpayer identification number to a US payer.
When it applies
UK businesses or individuals who are US persons for tax purposes, or who receive certain US payments, may be asked to complete a W-9 instead of a W-8BEN.
Tax rules depend on individual circumstances and can change. This glossary is general information rather than personalised tax advice.