41 CFR § 301-71.305
When must an employee account for a travel advance?
June 9, 2020
An employee must account for an outstanding travel advance each time a travel claim is filed. If the employee receives a travel advance but determines that the related travel will not be performed, then the employee must inform you that the travel will not be performed and repay the advance at that time.
[FTR Amdt. 70, 63 FR 15974, Apr. 1, 1998. Redesignated by FTR Amdt. 108, 67 FR 57967, Sept. 13, 2002]