D.C. Code § 47-864.01
Conditional applicability: Section 1287(a) of D.C. Law 16-33 provided:
"(a) Section 1286 shall apply for taxable years beginning after September 30, 2005; provided, that the condition of subsection (b) of this section is met prior to February 15, 2006; provided further, that section 1286 shall apply for the second half of fiscal year 2006 if the condition of subsection (b) of this section is met after February 14, 2006 and prior to August 5, 2006."
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."