8/26/2022 — Nonwage benefits have become increasingly important and now represent 30% of total compensation (BLS, 2021). Using administrative data on health insurance, retirement, and leave benefits, we find dramatically lower within-firm variation in benefits than in wages. We also document sharply higher between-firm variation in nonwage benefits, compared to wages. We argue that this pattern can be a consequence of nondiscrimination regulations and the high administrative burden of managing too many or complex plans