Section 102-118.630 - [Effective 12/26/2024] How must a TSP refund amounts due to GSA?(a) TSPs must promptly refund amounts due to GSA, preferably via TAMS or by ACH. If an ACH is not used, checks must be made payable to the "General Services Administration", including the document reference number, TSP name, bill number(s), taxpayer identification number and standard carrier alpha code, then mailed to the appropriate address listed on the Accounts and Collections web page at https://www.gsa.gov/transaudits.(b) If an ACH address is needed, visit https://www.gsa.gov/transaudits (Accounts and Collections web page) or contact the GSA Transportation Audits Division via email at: audits.collections@gsa.gov. 87 FR 32326 , May 31, 2022 87 FR 32320 , 8/29/2022; 89 FR 93198 , 12/26/2024 Note 1 to § 102-118.630: Amounts collected by GSA are returned to the Treasurer of the United States (31 U.S.C. 3726 ).