1. All benefits and all necessary administrative expenses of the retirement system shall be paid from the funds of the retirement system.

2. The base pension of a member who, after August 28, 2011, retires from or otherwise terminates active service with entitlement to a base pension under sections 86.900 to 86.1280 shall commence as of the first day of the month next following such retirement or termination with no proration of such pension for the month in which such retirement or termination occurs. The supplemental retirement benefits of a member who, after August 28, 2011, retires from or otherwise terminates active service with entitlement to a supplemental retirement benefit provided in subsection 1 of section 86.1230 or as provided in section 86.1231 shall commence as of the first day of the month next following such retirement or termination with no proration of such supplemental retirement benefit for the month in which such retirement or termination occurs.

3. Upon the death of a member who is receiving a base pension under sections 86.900 to 86.1280 leaving a surviving spouse, as defined in section 86.900, entitled to benefits, payment of the member’s base pension including all cost-of-living adjustments thereto, prorated for that portion of the month of such death in which such member was living, shall be made to such surviving spouse, and the benefit for which such spouse is entitled under section 86.1240 or subdivision (1) of subsection 2 of section 86.1151 shall be prorated and paid to such spouse for the remainder of such month.

4. Upon the death of a member who is receiving a base pension under sections 86.900 to 86.1280 leaving no surviving spouse, as defined in section 86.900, entitled to benefits, payment of the member’s base pension including all cost-of-living adjustments thereto, prorated for that portion of the month of such death in which such member was living, shall be made in equal shares to or for the benefit of the children, if any, of such member as are entitled to share in spousal benefits as described in subsection 2 of section 86.1250. If no such children shall survive such member, such prorated benefit for the month of such member’s death shall be paid to the beneficiary named by such member in a writing filed with the retirement system prior to the member’s death for the purpose of receiving such benefit. If no beneficiary is named, then no payment shall be made of such prorated benefit for the month of such member’s death.

5. Upon the death of a surviving spouse who is receiving a base pension under section 86.1240 or subdivision (1) of subsection 2 of section 86.1151, payment of such spouse’s base pension including all cost-of-living adjustments thereto, prorated for that portion of the month of such death in which such spouse was living, shall be made in equal shares to or for the benefit of the children, if any, of the member of whom such spouse is the surviving spouse as are entitled to share in spousal benefits described in subsection 2 of section 86.1250. If no such children shall survive such spouse, such prorated benefit for the month of such spouse’s death shall be paid to the beneficiary named by such surviving spouse in a writing filed with the retirement system prior to such spouse’s death for the purpose of receiving such benefit. If no beneficiary is named, then no payment shall be made of such prorated benefit for the month of such spouse’s death.

6. Upon the death of a Tier I member who is receiving a supplemental benefit under section 86.1230 or upon the death of a Tier II member who is receiving a supplemental benefit under section 86.1231 and who leaves a surviving spouse, as defined in section 86.900, entitled to benefits, the entire supplemental benefit for the month of such death shall be paid to such surviving spouse without proration, and the surviving spouse shall receive no additional supplemental benefit for such month.

7. Upon the death of a Tier I member who is receiving a supplemental benefit under section 86.1230 or upon the death of a Tier II member who is receiving a supplemental benefit under section 86.1231 and who leaves no surviving spouse, as defined in section 86.900, entitled to benefits, or upon the death of a surviving spouse who is receiving a supplemental benefit under section 86.1230 or section 86.1231, such supplemental benefit shall terminate upon such death. No benefit shall be payable for any period after the most recent monthly payment of such benefit prior to such death.

8. Upon the death of a member in service who leaves a surviving spouse, as defined in section 86.900, entitled to benefits, the base pension of such surviving spouse shall commence as of the first day of the month next following such death with no proration of such pension for the month in which such death occurs.

9. Upon the death of a member in service who leaves no surviving spouse, as defined in section 86.900, entitled to benefits, any benefit payable to surviving children of such member under subsection 2 of section 86.1250 shall commence as of the first day of the month next following such death with no proration of such benefit for the month in which such death occurs. If there are no such surviving children entitled to such benefit, then such member’s accumulated contributions shall be paid to the beneficiary named by such member in a writing filed with the retirement system prior to the member’s death for the purpose of receiving such benefit, or if no beneficiary is named, then to such member’s estate.

10. Upon the death of a member in service or after retirement, any benefit payable to the surviving children of such member under subsection 1 of section 86.1250 shall commence as of the first day of the month next following such death with no proration of such benefit for the month in which such death occurs.

11. All payments of any benefit shall be paid on the last business day of each month for that month. For any benefit under sections 86.900 to 86.1280, the retirement system shall withhold payment of such benefit until all requisite documentation has been filed with the retirement system evidencing the entitlement of payee to such payment.

12. If no benefits are otherwise payable to a surviving spouse or child of a deceased member or otherwise as provided in this section, the member’s accumulated contributions, to any extent not fully paid to such member prior to the member’s death or to the surviving spouse or child of such member or otherwise as provided in this section, shall be paid in one lump sum to the member’s beneficiary named by such member in a writing filed with the retirement system prior to the member’s death for the purpose of receiving such benefit, or if no beneficiary is named, then to such member’s estate. Such payment shall constitute full and final payment of any and all claims for benefits under the retirement system.