D.C. Code § 47-845.02
Section 1144 of D.C. Law 16-33 provided that §§ 1142 and 1143 shall apply to tax periods beginning after September 30, 2005.
Applicability of D.C. Law 21-36: Section 7048(b) of D.C. Law 21-36 provided that §§ 7027, 7031, 7036, and 7037 of the act shall apply as of October 1, 2014.