A seating assembly for a vehicle includes a seat having a seat cushion assembly. A seatback is pivotally coupled with the seat and includes a seatback cushion assembly. A polymeric hard back panel is operably coupled with the seatback and includes a recessed portion. A controlled deformation portion includes a rupture line configured to split during a rear impact collision of the vehicle, resulting in flaps of the controlled deformation portion extending rearward relative to the seatback. The controlled deformation portion is generally concealed from rearward view by a pocket wall.