A data processing method and system administers a deferred annuity product during the accumulation phase of a contract term. The annuity product permits the client to select both an interest rate which is reset periodically (reset rate) and an interest rate which is guaranteed for multiple years (MYG rate), during the same contract term. The client may elect to automatically switch from the reset rate to the MYG rate, for the remainder of the contract term, when the reset rate falls below the MYG rate.