Abstract: A computer system for processing data related to fixed annuities includes: one or more data storage devices storing data associated with fixed annuities and indicative of account values, a time period for crediting of interest; and a crediting method including for each of the fixed annuities one of at least an equity index based crediting method and a price index based crediting method; and an annuity administration hardware server configured to: receive price index value data, determine a price index crediting rate for each of the fixed annuities having a price index based crediting method based on the received price index value data, a threshold value of the price index, a participation rate, and the guaranteed rate; and calculate updated account values using the price index crediting rate and the account values;