Go to: for instructions and the latest information. Contact information for the Tax Division. ▷ Go to: for current contact information. What Is a Form W-9? A tax return is tax form. Form W-9 will show you or your business or the business from which your income is derived and how the income was earned. The IRS expects you to keep records in the proper form to prove to the IRS the information shown on your W-9 and to help the IRS verify the information to the Internal Revenue Service. The following descriptions indicate the information each form will show. Form W-9 is a request for taxpayer identification number and certification which indicates the information required from that taxpayer. Form W-9 is also used if you don't have a taxpayer identification number or a tax identification number. A. Form 2555 or 2555A — Business Income. ▷ Go to: This is for businesses located in the continental United States (the District of Columbia and Hawaii are not included). For details, see Publication 1140 for an overview of the tax code for small business, and for a summary of the code for small businesses, see Publication 515, Business Expenses, and Publication 535, Reporting and Record keeping Requirements. ▷ A Form 2555A is also available for a business located in Puerto Rico, U.S. Virgin Islands, and American Samoa. Note: You don't have to complete the Form 2555. You are entitled to obtain a Form 507 to show how much you paid to contractors for services performed in your own business. The contractor was a U.S. resident if it was a contract for the service of another person and performed under that person's contract or you personally completed the invoice and paid to the contractor. Generally, if you don't know who contracted for the work, you can't get a Form 507. If you have the invoice, or you know who paid, you can get a Form 507. You can get a Form 507 by calling the Form W-9 Bureau at ; by filing Form 4769 with the Internal Revenue Service (IRS); or by filing Form 8300.