If you missed your opportunity to enroll in your employer plan during the company’s open enrollment season, you may apply for coverage in the marketplace during open enrollment, which runs from November 1 to December 15. You can also apply for premium tax credits but you will have to provide information on the health coverage you are eligible for at work, even if you’re not enrolled in the plan. If the plan offered meets standards for affordability and minimum value, you will not be eligible for premium tax credits or cost-sharing reductions. (26 U.S.C. § 36B).