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W-9 is for US entities so, based on the 'UK' part of your question, you're probably sending the wrong form.
If you are based in the UK and have US activities, you'll need to send in a "Certificate of Foreign Status of Beneficial Owner for United States Tax Withholding". Depending on your situation, you can either use a w8ben or a w8ben-e form for that.
It's also possible that instead of a w8ben or w8ben-e, you'll have to send in a w8imy or w8eci, depending on your situation. This is however very unlikely.
If you are based in the UK and have no US activities, you'll need to send in a "Certificate of No U.S. Activities". There's no standard form for that. Some affiliate networks will provide a draft/template for you or else you can have your accountant or lawyer write one. Or you could write it yourself.
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