D.C. Code § 47-845.03
Section 1144 of D.C. Law 16-33 provided that §§ 1142 and 1143 shall apply to tax periods beginning after September 30, 2005.
D.C. Law 20-141 became effective on Dec. 4, 2014, but was repealed prior to its effective date by emergency D.C. Act 20-377, § 7114, eff. July 14, 2014, 61 DCR 7598, by emergency D.C. Act 20-449, § 7104, eff. October 10, 2014, 61 DCR 10915, by emergency D.C. Act 20-566, § 7104, eff. January 9, 2015, 62 DCR 884, and by D.C. Law 20-155, § 7104, 61 DCR 9990.
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.