D.C. Code § 2-220.07: Records.

All recipients and subcontractors shall retain payroll records created and maintained in the regular course of business under District of Columbia law for a period of at least 3 years or the prevailing federal standard at the time the record is created, which shall be identified in rules issued pursuant to this subchapter, whichever is greater, from the payroll date for employees subject to § 2-220.03.