(i) who has completed twenty or more years of credited service; and

(ii) who has attained age fifty; and

(iii) who has paid, before the effective date of retirement, all additional member contributions and interest (if any) required by subdivision e of this section; and

(iv) who files with the retirement system of which he or she is a member an application for service retirement setting forth at what time he or she desires to be retired; and

(v) who shall be a participant in the twenty-year/age fifty retirement program at the time so specified for his or her retirement; shall be retired pursuant to the provisions of this section affording early service retirement. 2. (i) Notwithstanding any other provision of law to the contrary, the early service retirement benefit for participants in the twenty-year/age fifty retirement program who retire pursuant to paragraph one of this subdivision shall be a pension consisting of:

(A) an amount, on account of the required minimum period of service, equal to one-half of his or her final average salary; plus

(B) an amount of credited service, or fraction thereof, beyond such required minimum period of service equal to one and one-half percent of his or her final average salary.

(ii) The maximum pension computed without optional modification payable pursuant to subparagraph (i) of this paragraph shall equal that payable upon completion of thirty years of service. d. Vesting. 1. A participant in the twenty-year/age fifty retirement program who:

(i) discontinues service as a Triborough bridge and tunnel member, other than by death or retirement; and

(ii) in the case of a participant who is not a New York city revised plan member, prior to such discontinuance, completed five but less than twenty years of credited service or, in the case of a participant who is a New York city revised plan member, has completed ten but less than twenty years of credited service; and

(iii) has paid, prior to such discontinuance, all additional member contributions and interest (if any) required by subdivision e of this section; and

(iv) does not withdraw in whole or in part his or her accumulated member contributions pursuant to section six hundred thirteen of this article unless such participant thereafter returns to public service and repays the amounts so withdrawn, together with interest, pursuant to such section six hundred thirteen; shall be entitled to receive a deferred vested benefit as provided in this subdivision. 2. (i) Upon such discontinuance under the conditions and in compliance with the provisions of paragraph one of this subdivision, such deferred vested benefit shall vest automatically.

(ii) In the case of a participant who is not a New York city revised plan member, such vested benefit shall become payable on the earliest date on which such discontinued member could have retired for service if such discontinuance had not occurred or, in the case of a participant who is a New York city revised plan member, such vested benefit shall become payable at age sixty-three. 3. Such deferred vested benefit shall be a pension consisting of an amount equal to two and one-half percent of such discontinued member's final average salary, multiplied by the number of years of credited service. e. Additional member contributions. 1. In addition to the member contributions required by section six hundred thirteen of this article, each participant in the twenty-year/age fifty retirement program in the rank of bridge and tunnel officer shall contribute to the retirement system of which he or she is a member (subject to the applicable provisions of subdivision d of section six hundred thirteen of this article) an additional five and fifty one-hundredths percent of his or her compensation and each participant in the twenty-year/age fifty retirement program in the rank of sergeant or lieutenant shall contribute to the retirement system an additional six percent of his or her compensation earned from all allowable service as a Triborough bridge and tunnel member rendered on and after the date which is one hundred eighty days prior to the starting date of the twenty-year/age fifty retirement program. A participant in the twenty-year/age fifty retirement program shall contribute additional member contributions until the later of (i) the date as of which he or she has twenty years of credited service as a bridge and tunnel officer, or (ii) the third anniversary of the date that he or she last became a participant in the twenty-year/age fifty retirement program. 2. Commencing with the first full payroll period after each person becomes a participant in the twenty-year/age fifty retirement program, additional member contributions at the rate specified in paragraph one of this subdivision shall be deducted (subject to the applicable provisions of subdivision d of section six hundred thirteen of this article) from the compensation of such participant on each and every payroll of such participant for each and every payroll period. 3. (i) Subject to the provisions of subparagraph (ii) of this paragraph, where any additional member contributions required by paragraph one of this subdivision are not paid by deductions from a participant's compensation pursuant to paragraph two of this subdivision:

(A) that participant shall be charged with a contribution deficiency consisting of such unpaid amounts, together with interest thereon at the rate of five percent per annum, compounded annually; and

(B) such interest on each amount of undeducted contributions shall accrue from the end of the payroll period for which such amount would have been deducted from compensation if he or she had been a participant at the beginning of that payroll period, until such amount is paid to the retirement system.

(ii) Except as provided in subparagraph (iii) of this paragraph, no interest shall be due on any such unpaid additional contributions which are not attributable to the period prior to the first full payroll period referred to in paragraph two of this subdivision.

(iii) Should any person who, pursuant to paragraph eight of this subdivision, has withdrawn any additional member contributions (and any interest paid thereon) again become a participant in the twenty-year/age fifty retirement program pursuant to paragraph six of subdivision b of this section, an appropriate amount shall be included in such participant's contribution deficiency (including interest thereon as calculated pursuant to subparagraph (i) of this paragraph) as if such additional contributions had never been made.

(iv) Notwithstanding any other provisions of this paragraph, no participant shall be charged interest for any period prior to March twenty-fifth, nineteen hundred ninety-eight with respect to any contributions owed with respect to any payroll period beginning prior to such date. 4. The head of a retirement system which includes participants in the twenty-year/age fifty retirement program in its membership may, consistent with the provisions of this subdivision, promulgate regulations for the payment of such additional member contributions, and any interest thereon, by such participants (including the deduction of such contributions, and any interest thereon, from the participant's compensation). 5. Where a contribution deficiency chargeable to a participant pursuant to paragraph three of this subdivision has not been paid in full before the effective date of retirement, that participant shall not be eligible to retire pursuant to subdivision c of this section. 6. Where a contribution deficiency chargeable to a participant pursuant to paragraph three of this subdivision has not been paid in full before the date of discontinuance of service, that participant shall not be entitled to a deferred vested benefit pursuant to subdivision d of this section. 7. Where a participant has not paid in full any contribution deficiency chargeable to him or her pursuant to paragraph three of this subdivision, and a benefit, other than a refund of member contributions pursuant to section six hundred thirteen of this article or a refund of additional member contributions pursuant to paragraph eight of this subdivision, becomes payable under this article to the participant or to his or her designated beneficiary or estate, the actuarial equivalent of any such unpaid amount shall be deducted from the benefit otherwise payable. 7-a. Notwithstanding paragraph six or seven of this subdivision, where a deficiency chargeable to a participant pursuant to paragraph three of this subdivision has not been paid in full while the participant is a Triborough bridge and tunnel member and such participant retires prior to July first, two thousand eleven, such participant may elect to be covered by this paragraph. Such participant shall be entitled to the benefits provided in subdivision c of this section provided that participant authorizes the retirement system to deduct from such benefits an amount which will result in the deficiency, plus associated interest to date of final payment, being paid in full no later than July first, two thousand eleven or such earlier date as agreed to by the participant. Such amount will be deducted in equal installments on a monthly basis. Nothing in this paragraph shall prevent the participant from making a partial payment of the amount of the deficiency at the time of retirement so as to reduce the monthly payment nor to make a lump sum payment equal to the amount of the total unpaid balance at any time during the period of repayment. 8. (i) Such additional member contributions (and any interest thereon) shall be paid into the contingent reserve fund of the retirement system of which the participant is a member and shall not for any purpose be deemed to be member contributions or accumulated contributions of a member under section six hundred thirteen of this article or otherwise while he or she is a participant in the twenty-year/age fifty retirement program or otherwise, except that, a surplus of such additional member contributions that are paid into the retirement system's contingent reserve fund may be used for the sole purpose of offsetting a deficit of basic member contributions.

(ii) Should a participant in the twenty-year/age fifty retirement program who has rendered less than fifteen years of allowable service as a Triborough bridge and tunnel member cease to hold a position as a Triborough bridge and tunnel member for any reason whatsoever, his or her accumulated additional member contributions made pursuant to this subdivision (together with any interest thereon paid to the retirement system) may be withdrawn by him or her pursuant to procedures promulgated in regulations of the board of trustees of the retirement system, together with interest thereon at the rate of five percent per annum, compounded annually.

(iii) Except as provided in subparagraph (ii) of this paragraph, no member, while he or she is a participant or otherwise, shall have a right to withdraw such additional member contributions or any interest thereon from the retirement system. 9. A member who has made the additional contributions specified by this subdivision may borrow a portion of such contributions, pursuant to the provisions of section six hundred thirteen-b of this article. * NB There are 3 § 604-c's