102-118.630—How must a TSP refund amounts due to GSA?
(a)
TSPs must promptly refund amounts due to GSA, preferably by EFT. If an EFT is not used, checks must be made payable to “General Services Administration”, including the document reference number, TSP name, bill number(s), taxpayer identification number and standard carrier alpha code, then mailed to:
General Services Administration
P.O. Box 93746
Chicago, IL 60673
General Services Administration
Transportation Audit Division (QMCA)
Crystal Plaza 4, Room 300
2200 Crystal Drive
Arlington, VA 22202
www.gsa.gov/transaudits