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IRS Form W-9: Request for Taxpayer Identification Number and Certification

Find out what to do if you receive a request for a W-9 form.

IRS Form W-9, Request for Taxpayer Identification Number and Certification, is used to certify the taxpayer identification number (TIN) or Federal Employer Identification Number (FEIN), type of taxpayer, and tax status. UCSD needs to be concerned with W-9s for both payers and payees.

W-9s for payers to UCSD

Your department might receive a W-9 request from payers so that they can properly report information in connection with miscellaneous payments to the university (for interest, dividends, rents, royalties, etc.), or by donors to enable them to claim tax deductions for gifts, donations, or grants to the university. If you receive a request from a payer for a W-9, for most purposes, submit the standard UCSD form W-9, for FEIN 956006144 (PDF). For US income tax purposes payees will be asked to provide their citizenship status, legal name, address and SSN when registering via PaymentWorks.

The signature authority for W-9s have been delegated to departments.  As long as you are a US citizen or US resident alien and a UC San Diego employee, you or your supervisor, may sign and date the W-9.

For additional information, contact us via Services & Support (login required). If you do not have Single Sign-On access, please contact us by email at

W-9s for payees of UCSD

Learn how to set up a new payee in PaymentWorks.

Find answers, request services, or get help from our team at the UC San Diego Services & Support portal.