Vendor Invoice Requirements

To avoid payment delays, invoices should be mailed directly to the Accounts Payable at the address below. Sending invoices to the Sold To / Ship To Address may delay payment.

Washington University
Accounts Payable
MSC-1056-423-1500
700 Rosedale Avenue
St. Louis, MO 63112-1408

The following information must be included on the invoice:

  • A valid Purchase Order (PO) number.
  • An invoice number, invoice date, invoice detail and amount.
  • A valid Remittance Address to mail check payment or ACH instructions. Note: To learn about requirements for ACH payments, click here.

Additional invoice requirements:

  • Multiple purchase orders may not be combined on a single invoice.
  • Invoices should not include Missouri sales tax. See Paying Sales & Use Tax for additional information and exception certificates.