The employer mandate, part of the Affordable Care Act, requires applicable large employers (ALEs) to provide affordable minimum essential coverage to full-time employees or pay a penalty. Employers subject to this mandate must also comply with reporting requirements, including submitting forms 1094-C and 1095-C to the IRS. The document outlines the definitions of full-time employees, applicable size thresholds, and how BambooHR can assist in managing ACA compliance.