Some policymakers propose capping the amount of employer-sponsored insurance that is exempt from federal income and payroll taxes. If such a cap is based on employer premiums, inequities will result. Workers could pay higher taxes if their employer is located in a high-cost area, if many co-workers are in their 50s and 60s, or if a few employees have a major illness or accident. To avoid such inequities, the cap could be based on benefit generosity, measured by actuarial value, which is the cost of expected claims if a nationally representative population received the covered benefits.