An image forming apparatus may comprise a first feeding unit, a second feeding unit, a feeding control unit, an image forming unit, a reversal unit, a post-processing unit, and a post-processing control unit. Based on a post-processing time amount notified from the post-processing control unit, the feeding control unit does not allow a sheet to wait in the reversal unit and adjusts a feed time of a sheet fed from the first feeding unit so that the sheet fed from the first feeding unit does not contact with a sheet waiting in the second feeding unit.