The annual Kaiser Family Foundation Employer Health Benefits Survey is the benchmark survey of the cost and coverage of employer-sponsored health benefits in the United States. The 2020 survey was designed and largely fielded before the full extent of the coronavirus disease 2019 (COVID-19) pandemic had been felt by employers. Data collection took place from mid-January through July, with half of the interviews being completed in the first three months of the year. Most of the key metrics that we measure-including premiums and cost sharing-reflect employers' decisions made before the full impacts of the pandemic were felt. We found that in 2020 the average annual premium for single coverage rose 4 percent, to $7,470, and the average annual premium for family coverage also rose 4 percent, to $21,342. Covered workers, on average, contributed 17 percent of the cost for single coverage and 27 percent of the cost for family coverage. Fifty-six percent of firms offered health benefits to at least some of their workers, and 64 percent of workers were covered at their own firm. Many large employers reported having "very broad" provider networks, but many recognized that their largest plan had a narrower network for mental health providers.