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Hello Isabel,
Thank you for using our Microsoft Advertising Community Forum!
I have provided for you the latest W-9 Form we have. Please check your private messages for accessing the file.
Tax or VAT requirements depend on your business location, which is the country/region where your business is legally registered. (If you are an agency, it is the country/region where your client's business is legally registered.) Select your billing location from the list provided on the help page below to find specific tax information.
Tax or VAT information (microsoft.com)
For business locations in the United States of America, billing is managed by Microsoft Online, Inc., in the United States, and Microsoft Advertising is not required to charge taxes on advertising costs.
Microsoft Advertising cannot provide guidance on tax or VAT. Please contact your tax advisor or local tax office if you have questions.
Our support teams are happy to discuss your account in more detail via phone, chat or email to provide review assistance, please see our support page to reach out!
I hope the information provided here will at least partly answer your question. If you have any additional questions please do not hesitate to reach out to our support. You are also welcome to respond to me if you need help with anything else.
Kind regards,
Vahid | Microsoft Advertising Support Specialist | 800-518-5689