While both traditional defined benefit plans and cash balance plans are required to offer payment of an employee’s benefit in the form of a series of payments for life, traditional defined benefit plans define an employee’s benefit as a series of monthly payments for life to begin at retirement, but cash balance plans define the benefit in terms of a stated account balance. These accounts are often referred to as hypothetical accounts because they do not reflect actual contributions to an account or actual gains and losses allocable to the account.
Source: U.S. Department of Labor