5 U.S. Code § 5525
5.U.S. Code § 5525 is about Allotment and assignment of pay. It is under Part 3 (Employees) Subpart D (Pay and Allowances) Subchapter 3 (Advancement, Allotment, And Assignment Of Pay) Chapter 55 (Pay Administration) of Title 5 (Government Organizations and Employees) of the Code.
The head of each agency may establish procedures under which each employee of the agency is permitted to make allotments and assignments of amounts out of his pay for such purpose as the head of the agency considers appropriate. For purposes of this section, the term “agency” includes the Office of the Architect of the Capitol.