Novel systems and methods for managing a plurality of client demand accounts so as to allow a banking institution to retain client deposits on the bank's balance sheets while, at the same time, providing the client with the capability of implementing up to an unlimited number of transactions per month and also providing the client with interest on their account balances. These objectives are achieved through the use of a pooled deposit account at the client's savings institution or bank. Funds are transferred from individual client demand accounts to the pooled insured deposit account. All or a portion of the interest accrued from the pooled deposit account is then distributed to individual clients. The interest may, but need not, be distributed according to the relative proportions of each client's funds in the pooled deposit account. A database keeps track of deposits to, and withdrawals from, each of the client demand accounts, as well as each client's proportionate and/or monetary share in the pooled deposit account. On a regular, periodic, or recurring basis, a net transaction is calculated as the sum of individual client deposits and withdrawals from the plurality of demand accounts. The net transaction calculation is used to determine an amount of funds that need to be deposited into the pooled deposit account to cover client deposits, or an amount of funds that needs to be withdrawn from the pooled deposit account to cover client withdrawals. Individual account management calculations are performed to determine whether to deposit or withdraw funds from the pooled deposit account to each of a plurality of individual client demand accounts. The database is updated for each client's deposit and withdrawal activities. The invention permits funds to be deposited into a demand account from various sources, and also provides for the tendering of payments from the demand account via different instruments, without limitation as to the number of transfers, and with accrual of interest on the deposited funds.