302-16.103—May I claim an amount in excess of that prescribed in § 302-16.102?

Yes, you may claim an amount in excess of that prescribed in § 302-16.12 if authorized by your agency; and
(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:
(1) One week if you are relocating without an immediate family; or
(2) Two weeks if you are relocating with an immediate family.

Code of Federal Regulations

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.