Yes, you would include a Federal 1120-S with your F+1120A, but not with your DR-405.
Required Attachments
Attach a copy of the actual federal income tax return filed with
the Internal Revenue Service (IRS).
You must also attach copies of federal Forms 4562, 851 (or
Florida Form F-851), 1122, 1125-A, Schedule D, Schedule M-3,
and any supporting details for Schedules M-1 and M-2.
