Who Is Authorized to Sign a W9?. The purpose of a W9 form is to provide an entity that issues taxable payments to a company with the company's federal tax identification number. The IRS uses a W9 ...

If you're a freelancer, consultant, or contractor, or are self-employed in some other capacity, there's a good chance you'll run across the IRS W9 form. It's not as well known as other tax forms ...