A multi-linkage hinge assembly is provided for pivoting a seat cushion between flat and upright positions. The hinge assembly includes a base bracket, a seat bracket having a support surface, a front linkage member pivotally attached between the seat bracket and base bracket, a rear linkage assembly having a lower linkage member pivotally attached to an upper linkage member, and a tie linkage connecting the front linkage member to the rear linkage assembly. The tie linkage synchronizes movement of the front linkage and rear linkage assembly when the hinge is operated to move between an upright and flat position.