Platform implementing retrospective loss pooling

A computer-implemented method for paying expenses of a loss pooling group using a retrospective loss pooling platform, comprising:

• creating, using one or more processors, a first data structure comprising loss pools of group of members that are contractually obligated to collectively pay the expenses of other group members in respective time periods in response to expenses received from the members of the group in the respective time periods;
• the one or more processors creating a second data structure for receiving and validating expenses submitted by the group members in a given time period;
• and
• the second data structure causing payment of expenses received and validated in the given time period from payment accounts of respective members in the group in accordance with the group's contractual obligations,
• wherein the given time period occurs prior to payment.

A non-transitory machine readable medium storing instructions that when executed by at least one processor implement a method for paying expenses using a retrospective loss pooling platform by the at least one processor:

• creating loss pooling groups of members that are contractually obligated to collectively pay the expenses of other group members in respective time periods in response to expenses received from the members of the group in the respective time periods;
• receiving and validating expenses submitted by the group members in a given time period;
• and
• causing payment of expenses received and validated in the given time period from payment accounts of respective members in the group in accordance with the group's contractual obligations, wherein the given time period occurs prior to payment.