Commercial customers may contact the Commercial Accounts Receivable Office to obtain a copy of the invoice, or to obtain general information about the charges. Our staff can refer you to the appropriate sales department if detailed information about the charges is needed. If you already have an invoice, the NIU department's name and telephone number are listed under the customer mailing address.
Payment is to be made within 30 days of the date of the invoice. Any overpayment will be applied to the oldest outstanding invoice.
- Check payments should be made payable to Northern Illinois University and should be mailed to:
Commercial Accounts Receivable
Northern Illinois University
1425 W. Lincoln Hwy.
DeKalb, IL 60115-2828
- Credit/Debit Card or E-Check (online only):
- Automated payments over the phone: 815-981-3609
A convenience fee will be charged for online and phone payment services.
Returned Payments: Payments returned by your financial institution for any reason are subject to a service charge of $25.00.