Aatrix provides some helpful tools to help you determine which forms to submit.
In addition, this table might be helpful:
Which ACA forms to submit?
Not Self-Insured
Self-Insured
Fewer than 50 FTE’s
50+ FTE’s
Form(s) to employees
No reporting requirements
1095-C
(Parts I & II)
1095-B
(All parts)
Form(s) to IRS
1094-C
(and copies of all 1095-C forms)
1094-B
(and copies of all 1095-B forms)
DocLink: What do I need to know about Affordable Care Act?