2021 W9 Forms Printable – W-9–Request to Taxpayer Identity Number and Certificate–is a common IRS form. When you work for a client, or in case your business is independent, they may ask that you fill out and return a W-9 to make sure they can prepare the 1099-NEC form accurately and after that report the payments you receive at the close of the year. 2021 W9 Forms Printable