@megabeacon I've filed them once with my personal taxes back in 2015
A C-Corp return is a totally separate filing from a personal income tax return ... are you possibly saying you has a Sch C on your personal return for a sole prop business? If so just add the Sch C back to the personal return if you had any income from that business. In the prior years, if you had no income or expenses for the Sole Prop then no Sch C would have been filed which is normal.
