Code of Federal Regulations Title 41. Public Contracts and Property Management § 41.302–16.102?

(a) Supported by acceptable statements of fact, paid bills or other acceptable evidence justifying the amounts claimed;  and

(b) The aggregate amount does not exceed your basic gross pay (at the time you reported for duty, at your new official station) for:

Note to § 302–16.103:  The amount authorized cannot exceed the maximum rate of grade GS–13 provided in 5 U.S.C. 5332 at the time you reported for duty at your new official station.