Both. If a partnership ends because a partner or partners leave and there's one remaining person owning the entity, then the partnership files a 1065 for the period of time that there were multiple people involved, and then a Schedule C for the remaining period when only one owner was left.These business tax returns will each be for part of the year. This is designated with dates at the top of the 1065 and the Schedule C will be marked as a u201cfirst time filingu201d for this business.