A tailgate for a vehicle has a supplemental tailgate that retracts within the tailgate and is extendable therefrom in order to provide multiple assist functions. The supplemental tailgate includes a pivotable molding, which mounts on a movable frame portion, and a latching assembly. When pivoted, the pivotable molding releases the latching assembly, allowing the supplemental tailgate to be moved to various extended positions. When the movable frame portion is in an essentially fully extended position, it can be rotated downward relative to the tailgate and a flip step pivoted to a use position in order to provide an assist step function.