W9 or W8-BEN forms now needed for all vendors

Starting November 1st, W9 and W8-BEN forms are needed for all UW suppliers. Forms are not needed for vendors that already have one on file or for purchasing card purchases. The IRS’s most current forms need to be used and can be found at

The UW is transitioning to UW System’s SHARE supplier system which requires the forms. Requiring the form does NOT mean the payment is taxable or reportable. Connecting the system prepares the UW for future procurement automation, provides a unique vendor identifier for all campuses, and prevents duplicate supplier creation.

Questions can be directed to any CALS Business Services Accountant,