1. The annual service retirement allowance payable pursuant to section 169.320 shall be the retirant’s number of years of creditable service multiplied by a percentage of the retirant’s average final compensation, determined as follows:

(1) A retirant whose last employment as a regular employee ended prior to June 30, 1999, shall receive an annual service retirement allowance payable pursuant to section 169.320 in equal monthly installments for life equal to the retirant’s number of years of creditable service multiplied by one and three-fourths percent of the person‘s average final compensation, subject to a maximum of sixty percent of the person’s average final compensation;

(2) A retirant whose number of years of creditable service is greater than thirty-four and one-quarter on August 28, 1993, shall receive an annual service retirement allowance payable pursuant to section 169.320 in equal monthly installments for life equal to the retirant’s number of years of creditable service as of August 28, 1993, multiplied by one and three-fourths percent of the person’s average final compensation but shall not receive a greater annual service retirement allowance based on additional years of creditable service after August 28, 1993;

(3) A retirant who was an active member of the retirement system at any time on or after June 30, 1999, and who either retires before January 1, 2014, or is a member of the retirement system on December 31, 2013, and remains a member continuously to retirement shall receive an annual service retirement allowance payable pursuant to section 169.320 in equal monthly installments for life equal to the retirant’s number of years of creditable service multiplied by two percent of the person’s average final compensation, subject to a maximum of sixty percent of the person’s final compensation;

(4) A retirant who becomes a member of the retirement system on or after January 1, 2014, including any retirant who was a member of the retirement system before January 1, 2014, but ceased to be a member for any reason other than retirement, shall receive an annual service retirement allowance payable pursuant to section 169.320 in equal monthly installments for life equal to the retirant’s number of years of creditable service multiplied by one and three-fourths percent of the person’s average final compensation, subject to a maximum of sixty percent of the person’s average final compensation;

(5) Notwithstanding the provisions of subdivisions (1) to (4) of this subsection, effective January 1, 1996, any retirant who retired on, before or after January 1, 1996, with at least twenty years of creditable service shall receive at least three hundred dollars each month as a retirement allowance, or the actuarial equivalent thereof if the retirant elected any of the options available under section 169.326. Any retirant who retired with at least ten years of creditable service shall receive at least one hundred fifty dollars each month as a retirement allowance, plus fifteen dollars for each additional full year of creditable service greater than ten years but less than twenty years (or the actuarial equivalent thereof if the retirant elected any of the options available under section 169.326). Any beneficiary of a deceased retirant who retired with at least ten years of creditable service and elected one of the options available under section 169.326 shall also be entitled to the actuarial equivalent of the minimum benefit provided by this subsection, determined from the option chosen.

2. Except as otherwise provided in sections 169.331 and 169.585, payment of a retirant’s retirement allowance will be suspended for any month for which such person receives remuneration from the person’s employer or from any other employer in the retirement system established by section 169.280 for the performance of services except any such person other than a person receiving a disability retirement allowance under section 169.322 may serve as a nonregular substitute, part-time or temporary employee for not more than six hundred hours in any school year without becoming a member and without having the person’s retirement allowance discontinued, provided that through such substitute, part-time, or temporary employment, the person may earn no more than fifty percent of the annual salary or wages the person was last paid by the employer before the person retired and commenced receiving a retirement allowance, adjusted for inflation. If a person exceeds such hours limit or such compensation limit, payment of the person’s retirement allowance shall be suspended for the month in which such limit was exceeded and each subsequent month in the school year for which the person receives remuneration from any employer in the retirement system. In addition to the conditions set forth above, the restrictions of this subsection shall also apply to any person retired and currently receiving a retirement allowance under sections 169.270 to 169.400, other than for disability, who is employed by a third party or is performing work as an independent contractor if the services performed by such person are provided to or for the benefit of any employer in the retirement system established under section 169.280. The retirement system may require the employer receiving such services, the third-party employer, the independent contractor, and the retirant subject to this subsection to provide documentation showing compliance with this subsection. If such documentation is not provided, the retirement system may deem the retirant to have exceeded the limitations provided for in this subsection. If a retirant is reemployed by any employer in any capacity, whether pursuant to this section, or section 169.331 or 169.585, or as a regular employee, the amount of such person’s retirement allowance attributable to service prior to the person’s first retirement date shall not be changed by the reemployment. If the person again becomes an active member and earns additional creditable service, upon the person’s second retirement the person’s retirement allowance shall be the sum of:

(1) The retirement allowance the person was receiving at the time the person’s retirement allowance was suspended, pursuant to the payment option elected as of the first retirement date, plus the amount of any increase in such retirement allowance the person would have received pursuant to subsection 3 of this section had payments not been suspended during the person’s reemployment; and

(2) An additional retirement allowance computed using the benefit formula in effect on the person’s second retirement date, the person’s creditable service following reemployment, and the person’s average final annual compensation as of the second retirement date.

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The sum calculated pursuant to this subsection shall not exceed the greater of sixty percent of the person’s average final compensation as of the second retirement date or the amount determined pursuant to subdivision (1) of this subsection. Compensation earned prior to the person’s first retirement date shall be considered in determining the person’s average final compensation as of the second retirement date if such compensation would otherwise be included in determining the person’s average final compensation.

3. The board of trustees shall determine annually whether the investment return on funds of the system can provide for an increase in benefits for retirants eligible for such increase. A retirant shall and will be eligible for an increase awarded pursuant to this section as of the second January following the date the retirant commenced receiving retirement benefits. Any such increase shall also apply to any monthly joint and survivor retirement allowance payable to such retirant’s beneficiaries, regardless of age. The board shall make such determination as follows:

(1) After determination by the actuary of the investment return for the preceding year as of December thirty-first (the “valuation year”), the actuary shall recommend to the board of trustees what portion of the investment return is available to provide such benefits increase, if any, and shall recommend the amount of such benefits increase, if any, to be implemented as of the first day of the thirteenth month following the end of the valuation year, and first payable on or about the first day of the fourteenth month following the end of the valuation year. The actuary shall make such recommendations so as not to affect the financial soundness of the retirement system, recognizing the following safeguards:

(a) The retirement system’s funded ratio as of January first of the year preceding the year of a proposed increase shall be at least one hundred percent before adjusting for the effect of the proposed increase. The funded ratio is the ratio of assets to the pension benefit obligation;

(b) The actuarially required contribution rate, before adjusting for the effect of the proposed increase, may not exceed the then applicable employer and member contribution rate as determined under subsections 4, 5, and 6 of section 169.350;

(c) The actuary shall certify to the board of trustees that the proposed increase will not impair the actuarial soundness of the retirement system;

(d) A benefit increase, under this section, once awarded, cannot be reduced in succeeding years;

(2) The board of trustees shall review the actuary’s recommendation and report and shall, in their discretion, determine if any increase is prudent and, if so, shall determine the amount of increase to be awarded.

4. This section does not guarantee an annual increase to any retirant.

5. If an inactive member becomes an active member after June 30, 2001, and after a break in service, unless the person earns at least four additional years of creditable service without another break in service, upon retirement the person’s retirement allowance shall be calculated separately for each separate period of service ending in a break in service. The retirement allowance shall be the sum of the separate retirement allowances computed for each such period of service using the benefit formula in effect, the person’s average final compensation as of the last day of such period of service and the creditable service the person earned during such period of service; provided, however, if the person earns at least four additional years of creditable service without another break in service, all of the person’s creditable service prior to and including such service shall be aggregated and, upon retirement, the retirement allowance shall be computed using the benefit formula in effect and the person’s average final compensation as of the last day of such period of four or more years and all of the creditable service the person earned prior to and during such period.

6. Notwithstanding anything contained in this section to the contrary, the amount of the annual service retirement allowance payable to any retirant pursuant to the provisions of sections 169.270 to 169.400, including any adjustments made pursuant to subsection 3 of this section, shall at all times comply with the provisions and limitations of Section 415 of the Internal Revenue Code of 1986, as amended, and the regulations thereunder, the terms of which are specifically incorporated herein by reference.

7. All retirement systems established by the laws of the state of Missouri shall develop a procurement action plan for utilization of minority and women money managers, brokers and investment counselors. Such retirement systems shall report their progress annually to the joint committee on public employee retirement and the governor’s minority advocacy commission.