A modular seatback cover attachment system is disclosed. The modular seatback cover attachment system may include one or more trim caps including one or more tabs configured to reversibly couple the one or more trim caps to one or more portions of a seatback frame. The one or more tabs may include at least one of one or more hook tabs or one or more panel tabs. The modular seatback cover attachment system may include an interlocking assembly configured to interlock the one or more trim caps when the one or more trim caps are coupled to the seatback frame. The modular seatback cover attachment system may include a fastening assembly configured to couple the one or more trim caps to a portion of the dress cover.