This information (or most of it) pops up after you tap "submit". It is copied from the IRS W9 instructions. Payments you receive will be subject to backup withholding if: You do not furnish your TIN to the requester, You do not certify your TIN when required (see the instructions for Part II for details), 3. The IRS tells the requester that you furnished an incorrect TIN, 4. The IRS tells you that you are subject to backup withholding because you did not report all your interest and dividends on your tax return (for reportable interest and dividends only), or 5. You do not certify to the requester that you are not subject to backup withholding under 4 above (for reportable interest and dividend accounts opened after 1983 only). Certain payees and payments are exempt from backup withholding. See Exempt payee code, later, and the separate Instructions for the Requester of Form W-9 for more information. Also see Special rules for partnerships, earlier.