It depends. Your employer plan is permitted to establish financial incentives for plan enrollees to achieve certain health outcomes if they operate a workplace wellness program. Such incentives may include a premium surcharge of up to 30 percent of the total cost of coverage for a plan enrollee who fails to get the COVID-19 vaccine. (45 C.F.R. §147.102, 45 C.F.R. §146.121(f); CMS "FAQs about ACA, HIPAA and CARES Act Implementation," Oct. 4, 2021).