What is the effect of your flex plan on other benefits?
The general effect is positive because flex may help you reduce other benefit costs.
But, there may be an effect on pensions. As employees make “salary reduction” contributions to the various flex plan benefits you offer, their taxable income will be lower. You may want to make sure that income definitions in pension plans include the salary reduction amounts in flex to insure that the largest possible contributions levels are permitted in your pension plan(s).