D.C. Code § 47-4629
Section 3 of D.C. Law 18-128 provided:
"Sec. 3. Applicability. (a) This act shall apply upon the inclusion of its fiscal effect in an approved budget and financial plan.
"(b) Section 2 shall apply to tax years beginning October 1, 2008."
Section 7022 of D.C. Law 18-223 repealed section 3 of D.C. Law 18-128.