Why would you need to fill out a W9?

You need to fill out a W-9 form to provide your taxpayer identification information to a business or individual that is required to report payments made to you to the IRS. This form is typically requested when you are an independent contractor, freelancer, or otherwise engaged in a business relationship where you will receive $600 or more in payments during the tax year. Completing a W-9 ensures that the payer can accurately report your income and that you are properly classified for tax purposes.