What is the single largest tax expenditure in the federal tax code?

Question

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The employer health insurance deduction is the single largest tax expenditure in the federal tax code. It is estimated to cost the government over $280 billion in revenue each year. The deduction allows employers to exclude the cost of health insurance premiums paid for their employees from their taxable income, and employees do not pay taxes on the value of their employer-sponsored health insurance benefits.

What Is the Single Largest Tax Expenditure in the Federal