1. Any member in active service entitled to commence a pension under section 86.1540 may elect an optional distribution under the partial lump sum option plan provided in this section if the member:

(1) Notifies the retirement system in writing of the member’s retirement date at least ninety days in advance thereof and requests an explanation of the member’s rights under this section; and

(2) Notifies the retirement system of the member’s election hereunder at least thirty days in advance of the retirement date.

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Following receipt of an initial notice of a member’s retirement date and request for an explanation, the retirement system shall, at least sixty days in advance of such retirement date, provide the member a written explanation of such member’s rights under this section and an estimate of the amount by which the member’s regular monthly base pension would be reduced in the event of the member’s election of any of the options available to the member under this section.

2. (1) A member entitled to make an election under this section may elect to receive a lump sum distribution with the member’s initial monthly pension payment under section 86.1540, subject to all the terms of this section. The member may elect the amount of the member’s lump sum distribution from one, but not more than one, of the following options for which the member qualifies:

(a) A member having one or more years of creditable service after the member’s eligible retirement date may elect a lump sum amount equal to twelve times the initial monthly base pension the member would receive if no election were made under this section;

(b) A member having two or more years of creditable service after the member’s eligible retirement date may elect a lump sum amount equal to twenty-four times the initial monthly base pension the member would receive if no election were made under this section; or

(c) A member having three or more years of creditable service after the member’s eligible retirement date may elect a lump sum amount equal to thirty-six times the initial monthly base pension the member would receive if no election were made under this section.

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For purposes of this section, “eligible retirement date” for a member shall mean the earliest date on which the member could elect to retire and be entitled to receive a pension under section 86.1540.

(2) When a member makes an election to receive a lump sum distribution under this section, the base pension that the member would have received in the absence of an election shall be reduced on an actuarially equivalent basis to reflect the payment of the lump sum distribution, and the reduced base pension shall be the member’s base pension thereafter for all purposes relating to base pension amounts under sections 86.1310 to 86.1640, unless the member has also elected an optional benefit permitted under subsection 4 of section 86.1540.

(3) If a member electing a lump sum distribution under this section has elected the optional benefit permitted under subsection 4 of section 86.1540, the calculation of the member’s pension shall be made in the following order:

(a) The amount of the member’s normal pension under subdivision (1) of subsection 1 of section 86.1540 shall be reduced if applicable by any reductions required under subsection^* 2 or 3 of section 86.1540;

(b) The amount of the pension as determined under paragraph (a) of this subdivision shall be reduced to the actuarially equivalent amount to produce the optional form of benefit described in subdivision (1) of subsection 4 of section 86.1540;

(c) The amount of reduced pension as determined under paragraph (b) of this subdivision shall be further reduced as required to produce an actuarially equivalent benefit in the form of the lump sum distribution option elected under this section and a remaining monthly annuity which shall be paid on the basis that the initial annuity for the member’s spouse, if such spouse survives the member, shall be the same as the amount being paid the member on this annuity at the member’s death, and, subject to cost-of-living adjustments thereafter declared on the spouse’s base pension under section 86.1590, shall be paid to such surviving spouse for the lifetime of such spouse without regard to remarriage.

3. An election under this section to receive a lump sum distribution and reduced monthly base pension shall be void if the member dies before retirement, in which case amounts due a surviving spouse or other beneficiary of the member shall be determined without regard to such election.