Federal Tax Form W 9 2021 When they are working as a freelancer or independent professional, individuals most typically utilize IRS Form W-9. In case that you ever find yourself filling out a Form W-9, it means that an organization or individual who is paying you money needs your Social Security number so it can alert the IRS of the amount. The W-9 is utilized in a wide variety of payment situations, but the majority of frequently, taxpayers fill them out when they are working as a freelancer or independent specialist instead of a worker.Federal Tax Form W 9 2021