W9 2021 Form Printable Spanish – W-9–Request to Taxpayer Identity Number and Certificate–is a typical IRS form. When you function 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 are able to prepare the 1099-NEC form accurately and after that report the payments you receive at the close of the year. W9 2021 Form Printable Spanish