Applicable large employers (50 or more employees) must submit by today copies of the Forms 1095-C given to employees describing health coverage in 2015, along with a transmittal (Form 1094-C). The same goes for smaller employers with self-insured plans filing Form 1095-B (and Form 1094-B). If filing electronically, the deadline is June 30. How long should you retain copies? Usually it’s 3 years for income tax information returns; it’s 4 years for employment tax records.