A new survey from payroll services giant ADP reveals that about 40% of mid-sized and large companies that are offering health coverage to workers aren’t familiar with two new ObamaCare-related forms that must be filed with the Internal Revenue Service starting this tax season.

The forms — the 1094-C and the 1095-C — are designed to track compliance with the ObamaCare rule that mid- to large-sized employers offer affordable health insurance to workers or face a fine.