You can't cancel a change. You can, however, make another change, using Employee Express. You can change most
discretionary personnel and payroll transactions such as direct deposit, Federal and state tax withholdings, savings bonds, etc. at any time. Changes to FEHB and TSP are generally limited to Open Season. During FEHB Open Season, you may change your enrollment and/or waive or begin participation in premium conversion at any time up until the last day of Open Season. Employee Express will process only the last transaction.