Form W-9, Request for Taxpayer Identification Number and Certification, is a form that is often requested of US resident taxpayers.
A foreign-owned single-member LLC should not complete a Form W-9. The correct form would be the Form W-8 BEN for the case of an individual owner and a Form W8-BEN-E if the single owner is a business entity.
Corporations and multi-member LLCs taxed as partnerships can complete the Form W-9.
This form is retained by the requestor of the form, it is not sent to the IRS. The purpose of the form is to make sure the requestor has all of the information needed to comply with tax laws in regards to paying you.
We can help you complete Form W-9.