The W-9 page lets an account holder fill out or update an IRS Form W-9, Request for Taxpayer Identification Number and Certification.
Who Can Access the Update W-9 Page?
To update your W-9
Click Account Administration in the left pane, then click Update W-9.
Complete the form, then click Continue.
To access the IRS instructions for the form, click the Help link in the upper right corner of the page.
The following figure shows part of the W-9 form.