In light of the Affordable Care Act (ACA) upheld by the Supreme Court, employers must comply with current and upcoming ACA mandates, including a checklist for 2013 compliance. Key updates include limits on health flexible spending accounts, new reporting requirements regarding health coverage costs on W-2 forms, and mandatory coverage of preventive services for women without cost-sharing. Employers also need to inform employees about health insurance exchanges and are subject to fees for comparative effectiveness research.