A recent working paper, "Why Do Firms Convert to Cash Balance Pension Plans? An Empirical Investigation," written by Julie D'Souza of Cornell University, John Jacob of the University of Colorado, and Barbara Lougee of Morgan Stanley found the timing of "cash balance" conversions "appears to be linked to incentive compensation and profitability." Critics of these pension fund changes have suggested that companies may be motivated by the desire to inflate their book profits with surpluses in their pension trust funds, which are freed up by the conversion.
It's important to note defined benefit plans reward employees for long service while cash-balance plans tend to treat all workers equally. A typical traditional plan accrues benefits based on a percentage factor, multiplied by the number of years of service, multiplied by the participant's final five-year average base pay. Cash balance plans instead annually reserve a fixed percentage of base salary, plus interest, and are portable.
The study also found those who made the conversions do not have greater employee turnover than firms that retained their traditional defined benefit-plans, a fact that countered the argument the changes were made for the benefit of a more mobile work force. Additionally, the conversions were more common when incentive compensation was a larger proportion of total compensation.