D.C. Code § 47-864
Section 3 of Law 15-135 provided that § 2(a), (b), and (c)(3) of the act shall apply as of October 1, 2003.
Section 1083 of D.C. Law 16-33 provided that § 1082(a)(1), (b), (d)(1), and (d)(2)(B) shall apply for taxable years beginning after September 30, 2005.
Applicability and expiration of subtitle EE of title I, §§ 1261 to 1265, of D.C. Law 16-33: Sections 1263 and 1264 of D.C. Law 16-33, as amended by section 5(g) of D.C. Law 16-191 and D.C. Law 17-219, § 7068(c), (d), provided:
"Sec. 1263. Applicability; conditional effect.
"(a) Section 1262 shall apply for taxable years beginning after September 30, 2005."
"(b) Repealed.
"(c) Repealed.
"Sec. 1264. Repealed."
Applicability and expiration of §§ 1287 and 1288 of D.C. Law 16-33: Sections 1287 and 1288 of D.C. Law 16-33, as amended by D.C. Law 17-219, § 7068(h), (i), provided:
"Sec. 1287. Conditional applicability.
"(a) Section 1286 shall apply for taxable years beginning after September 30, 2005.
"(b) Repealed.
"Sec. 1288. Repealed."
Section 7072 of D.C. Law 18-111 provided: "Sec. 7072. Applicability. Section 7071 shall apply to tax periods beginning after September 30, 2009."
Applicability of D.C. Law 18-111: Section 7072 of D.C. Law 18-111, as amended by D.C. Law 19-171, § provided: "Applicability. Section 7071 shall apply to tax periods beginning after September 30, 2009."