University of Southern Indiana

Vendor Information

Accounts Payable sets up vendors in our system to provide for the timely payments of invoices. This requires the coordination between the university and our vendors.

Billing USI

All invoices to be paid by the University of Southern Indiana must be addressed as follows to receive proper handling:

University of Southern Indiana
Attn: Accounts Payable
PO Box 18158
Evansville, IN 47719

Vendors may opt to send invoices by email rather than postal mail, but must choose to invoice exclusively by one method or the other. Electronic billings should be sent to

The University will not be bound by the terms of any invoice mailed or delivered directly to another University employee or department. Accordingly, vendors who elect not to route invoices directly to Accounts Payable may experience significant payment delays.

Many times, when an invoice is mailed to another department, it is not forwarded to Accounts Payable in a timely fashion, therefore, prolonging payment. If the invoice is not addressed in this manner, you may expect delays in payment processing.

W-9 Requirement

The University must obtain certain information about the tax status of our vendors as required by Internal Revenue Service regulations. To meet those requirements, a completed Form W-9 (Request for Taxpayer Identification Number and Certification) must be on file for all vendors, with the following exceptions:

  • Payments to USI employees
  • Direct refunds of income
  • Payments to foreign persons (including nonresident alien individuals, foreign corporations, foreign partnerships, foreign trusts, foreign estates, and any other person that is not a U.S. person as defined by the IRS). Instead of Form W-9, these payments require completion of the appropriate Form W-8.

Form W-9 is available at

Direct Deposit

USI can process vendor payments via direct deposit (ACH). By enrolling in this program, future payments will be credited directly to your bank account and a remittance advice will be emailed to you informing you of each direct deposit transaction.

 Why enroll?

  • It is Fast. You will have access to your funds sooner by avoiding the delays associated with mailing paper checks.
  • It is Secure. Direct deposit eliminates the risk of your check being lost in the mail, sent to the wrong address, or stolen.
  • It is Convenient. Since the funds will be deposited directly to your bank account, you will not need to make a special trip to your financial institution to deposit your payment. You will also have access to your funds even if you are out of town or otherwise unable to receive and deposit your payment.

To take advantage of the speed and convenience of direct deposit, please complete the ACH Direct Deposit form and send it to USI Accounts Payable.

Contact Angela Torres


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