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A Â鶹´«Ã½ purchase order number (PUR) must be included on the invoices. If there is no purchase order (PUR) number the vendor must work with the specific department/school for invoice processing.

To ensure invoices are processed as quickly as possible with limited errors or review needed, invoices should be submitted following the instructions below:

• The invoice should be attached to an email. Do not send emails with an imbedded link to a portal that Â鶹´«Ã½ would need to download an invoice from.
• The invoice can be a pdf, word document, or excel file
• Only send one invoice attachment per email
• Do not send one attachment with multiple invoices. If multiple invoices are sent in the same attachment, use the attached separator sheet between invoices.
• Do not send zip files attached to emails

• Ensure that all invoices, regardless if sent directly by the vendor or by the department or school, include a purchase order number (PUR) before they are sent to this inbox.
• If an invoice does not have a purchase order (PUR), the department/school must process the invoices through a payment request - do not send the invoice to Accounts Payable.
• If an invoice references an old purchase order number, the department/school must add the correct purchase order number to the invoice and re-submit the invoice to invoicesonly@northwestern.edu. Also inform the vendor of the updated purchase order number.