Abstract: A computerized investment plan accounting system manages data for investment plans with multiple participants and multiple investment funds. When a transaction is entered, one side of the transaction (either units or dollars) may be flagged as pended. When the unit value for the fund is determined and stored, the pended side is calculated, stored, dated, and flagged as fixed. Investment fund balances are accumulated by posting the transactions to investment fund accounts. Individual participant fund balances are determined by accumulating transaction data in a multi-dimensional matrix. The participant fund balances are combined for all participants, and the combined totals are compared to the investment fund balances.