Solely for the purpose of determining the member’s eligibility for service retirement under this section, service shall include the member’s credited service prior to reinstatement.

service or disability retirement or other termination subsequent to the reinstatement shall be the sum of (1) his or her retirement allowance calculated on the basis of credited service rendered after reinstatement in accordance with the formula applicable to him or her plus (2) his or her retirement allowance as it was prior to reinstatement, adjusted by any change after reinstatement in the provisions governing the calculation of his or her allowance which would have applied to him or her had he or she continued in retirement.

The retirement allowance otherwise payable under this section to a member whose allowance prior to reinstatement was paid pursuant to his or her election under Section 31810 shall be reduced as provided in Section 31810. However, for a member reinstated pursuant to Section 31680.4 prior to attaining age 62, the reduction required by Section 31810 shall be the amount which is the actuarial value of the increase in the allowance from date of

retirement to date of reinstatement.

Notwithstanding any other provision of this chapter, the retirement allowance payable to any member subject to this section for any credited service for which a retirement allowance was paid prior to reinstatement shall not be less than the retirement allowance which would have been payable on the date of the subsequent retirement had the member not been reinstated, adjusted, however, by any reduction under this section because of an election under Section 31810.

subdivision (b), whichever is greater.