D.C. Mun. Regs. tit. 6, r. 6-B2904
Any indebtedness to the government by an employee or former employee, as provided in § 2900 or 2903, may be collected in monthly installments or at officially established regular pay intervals, by deduction in reasonable amounts as provided in this section.
Deductions may be made from any wages, salary, allowances, compensation, remuneration for services, or other authorized pay, including but not limited to back pay, severance pay, and lump sum leave payments.
Deductions may not be made from payments received from a retirement fund.
Except as provided in § 2904.5, the amount deducted for any period may not exceed twenty percent (20%) of disposable pay, except that a greater percentage may be deducted with the written consent of the employee or former employee concerned.
If the employee's employment with the government ends prior to collection of the full amount authorized by this section, deductions may be made from later payments of any nature, except as provided in § 2904.3, without regard to the limitation imposed by § 2904.4.
D.C. Mun. Regs. tit. 6, r. 6-B2904