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For Our Suppliers

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Vendor & Supplier Guides

  • Preparing & Submitting Invoices (PDF)

  • IRS & FTB Withholding Guidelines for Domestic Payees (PDF)

  • IRS & FTB Withholding Guidelines for Foreign Payees  (PDF)

  • General ITIN Information (PDF)

Payment Disbursement

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Who should I contact if I have questions concerning payments?

Most questions can be answered by calling the Procurement Services Hotline at (626) 395-8900 or via email at The Hotline is operational Monday through Friday from 8:00 a.m. to 5:00 p.m.

Davida Perez & Windy Amaya

(626) 395-8900

Supplier/Vendor Forms

  • Supplier Direct Deposit Authorization Form (PDF)

  • Foreign National Data Form (PDF)

  • Foreign National Visa Matrix (PDF)

  • IRS Form W-9 (PDF)

  • Non-Employee Traveler Form (PDF)