(v) members with wages greater than one hundred thousand per annum shall contribute six per centum of annual wages.
Notwithstanding the foregoing, during each of the first three plan years (April first to March thirty-first, except for members of New York city employees' retirement system, New York city teachers' retirement system and New York city board of education retirement system, plan year shall mean January first through December thirty-first commencing with the January first next succeeding the effective date of the chapter of the laws of two thousand fifteen that amended this paragraph) in which such member has established membership in a public retirement system of the state, such member shall contribute a percentage of annual wages in accordance with the preceding schedule based upon a projection of annual wages provided by the employer.
The head of each retirement system shall promulgate such regulations as may be necessary and appropriate with respect to the deduction of such contribution from members' wages and for the maintenance of any special fund or funds with respect to amounts so contributed.