An automated funds management system and in particular a system and a method to at least ensure the payment of guaranteed minimum income benefit (“GMIB”) based on the automated sector based allocation of funds in a variable annuity. A contract holder's profile data is evaluated and a profile score is computed based on the evaluated profile data. The GMIB payment stream value is computed based on the available profile data and the assigned profile score. An appropriate asset class percentage allocation of contract holder funds is recommended based on the assigned profile score and the computed GMIB payment stream value. Appropriate subaccounts are identified based on the defined asset class percentage allocation of contract holder funds, GMIB payment stream value, and/or profile score. The changes in the value of at least one market index are captured and based on a pre-determined change in the value of at least one market index, at least a portion of the invested contract holder funds are reallocated into relatively better performing market sector based subaccounts.