W-9 Form
- Form W-9 is a commonly used IRS form titled Request for Taxpayer Identification Number and Certification. True to its name, individuals and entities use the form to provide their taxpayer identification number to entities that will pay them income during the tax year. Companies use your W-9 for accounting purposes but doesn't send the form to the IRS. The information is used to prepare 1099-MISC forms at the end of the year.