N.Y.C. Admin. Code § 13-190: § 13-190 Members having service as council members; special expense payments included in compensation.

a. For the purpose of determining the rights, benefits, privileges and obligations, under this chapter, of any person who is, on or after the effective date of this section, a member, the compensation of such member with respect to any period of time heretofore or hereafter occurring during which he or she served or shall serve as a council member in the city council, or the compensation earnable by such member during any such period, shall be deemed to include the amount of any payments made to such member by the city during such period for councilmanic special expenses, subject to the provisions of subdivision b of this section.

b. Member contributions to the retirement system shall be made on the basis of compensation as determined pursuant to the provisions of subdivision a of this section; provided, however, that no additional member contributions, by reason of such determination, shall be required to be made with respect to any period prior to the effective date of this section.