As workers open their W-2 forms this month, many will see a new box with information on the total cost of employer-sponsored health insurance coverage. To some, it will be a surprise, perhaps even a shock. The disclosures, required by the 2010 health care law, are meant to make workers more cost-conscious. Health benefits are still tax-free. But labor unions and employer groups say it could be easier to tax them in the future, now that employers must report their value to the government.
