Billing
Billing Questions:
Contact: Emily Ngo Schick
E-mail: ekngo@ucdavis.edu
Phone: 1-530-752-8100
Analysis Order Forms (AOF) are required by the SIF, not only to identify your shipment of samples, but to provide important billing information to set-up an account with our lab. In order to set-up an account, our invoicing system requires the FED ID# of US customers (a 9-digit tax ID# often reported on a W-9 form). Individuals wishing to be directly invoiced, with the intention of paying by personal check ONLY, can enter their SSN# (optional). International customers enter your VAT# or other tax number. The Billing Contact should be the person or department paying the invoice.
Purchase orders (PO) may be required by your university / institution in order to 1) establish the terms of the services you are requesting from the SIF and 2) to authorize and allocate funds to pay for services rendered by the SIF. Contact your accounting department to determine if a purchase order is necessary. Purchase orders can be e-mailed, faxed, or mailed ATTN: to Emily Ngo Schick.
Estimates / Quotes can be requested to guarantee current analysis rates and to help customers establish POs and allocate funds. Estimates/quotes are not invoices. We do not issue Proforma Invoices for prepayment.
Invoices are generated 1-2 weeks after samples have been analyzed and the customer has received their data. Invoices are e-mailed as pdf attachments by Emily. A hard copy of your invoice can be requested on your Analysis Order Form or by contacting Emily.
Customers can request to be invoiced ahead of their data, however, in the event of poor/lost data, refunds may take up to 6 months to process. Instead, we prefer to rerun the samples or apply the credit towards future sample analysis.
Invoices are payable upon receipt (net 30 days). You may receive a past due notice if payment is not received within 60 days of invoice delivery. Delinquent accounts over 241 days old shall have a HOLD placed on the account, suspending sample analysis and data until the balance is paid.
Payment by check: (i.e. personal check, cashier's check, money order) Please include your 9-digit customer number and invoice number as found on your invoice. Payments missing this information may be returned minus a fee.
Make checks payable to: The Regents of the U.C.
Mail payment to: UC Davis
Cashier's Office
P.O. Box 989062
West Sacramento, CA 95798-9062
Payment by bank wire transfer: Please e-mail to request our bank information or to inform the SIF of payment details. Multiple invoices can be combined into one wire transfer, but please remember to include the invoice number(s), otherwise payment may be returned minus a fee.
Payment by credit card: The SIF now accepts payment by credit card. Please indicate your intention to pay by credit card on the newest version of the Analysis Order Form or notify us. Invoices for credit card payments are generated using a different system than check and wire transfer invoices. It is a lot of paperwork to switch payment type once an invoice is produced, so please select your payment type ahead of time. DO NOT SEND ANY CREDIT CARD INFORMATION via e-mail, phone, fax, letter, or Analysis Order Form to the SIF. We cannot guarantee the safety of your information. (Repeat offenders will be buying Emily some cute new shoes!) To pay by credit card, you will be invoiced and given directions on how to pay securely.
e-mail: sif@ucdavis.edu | phone: 530-752-8100 | fax: 530-752-4361 UC Davis Stable Isotope Facility | Department of Plant Sciences One Shields Avenue, Mail Stop #1 | Davis, California, 95616 | USA |







