SCHEDULESSCHEDULE 20 Changes for facilitating self-assessment: transitional provisions and savings Assessment under Cases IV and V of Schedule DF16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .F17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .