DRV_EE_COST_POST_TAX is a derived field used to display the post tax cost of the elected benefit. The system determines if the cost is pre tax or post tax based on if the Pre Tax toggle is checked ON or OFF in IBPN. It the toggle is off, the cost is determined to be Post Tax and will be displayed in this field. If the toggle is On, the cost is determined to be Pre Tax and the cost will be displayed in the Your Cost Pre Tax field. The cost is derived from the Benefit Component BC1040.