The Affordable Care Act requires employers to report the cost of coverage under an employer-sponsored group health plan. Reporting the cost of health care coverage on the Form W-2 does not mean that the coverage is taxable. The value of the employer’s excludable contribution to health coverage continues to be excludable from an employee’s income, and it is not taxable. This reporting is for informational purposes only and will provide employees useful and comparable consumer information on the cost of their health care coverage.
Employers that provide “applicable employer-sponsored coverage” under a group health plan are subject to the reporting requirement. This includes businesses, tax-exempt organizations, and federal, state and local government entities (except with respect to plans maintained primarily for members of the military and their families). However, federally recognized Indian tribal governments are not subject to this requirement.
Link to this IRS page: http://www.irs.gov/uac/Form-W-2-Reporting-of-Employer-Sponsored-Health-Coverage
Older Guidance on W-2 Reporting
IRS Notice 2011-1. 12/22/2010 — Delayed Effective Date of HCR Nondiscrimination Rules to Insured Plans.
Notice 2010-69 — Interim Relief with Respect to Form W-2 Reporting of the Cost of Coverage of Group Health Insurance Under § 6051(a)(14).