Chapter 12: The Design of the Tax System

The United States employs multiple revenue sources including personal income taxes, payroll taxes funding Social Security and Medicare, corporate income taxes, sales taxes, property taxes, and excise taxes on specific goods, together generating a tax burden lower than many developed nations. The chapter distinguishes between marginal tax rates, which apply to an additional dollar of income and directly influence economic incentives, and average tax rates, which represent total tax obligations relative to total income. Taxation creates deadweight loss when it distorts behavior by discouraging work, saving, or investment, and generates administrative costs through compliance requirements and incentive-driven loophole exploitation. A lump-sum tax imposed equally on all individuals would theoretically eliminate such distortions but remains politically unfeasible due to perceptions of unfairness. Regarding equity, the benefits principle suggests individuals should contribute taxes proportional to government services they utilize, exemplified by gasoline taxes funding road maintenance, while the ability-to-pay principle bases obligations on financial capacity. Within ability-to-pay frameworks, vertical equity demands higher earners contribute more, whereas horizontal equity ensures comparable treatment for those with similar income levels. Tax incidence analysis reveals that the actual burden often diverges from statutory responsibility, as corporate income taxes may be ultimately borne by workers through reduced wages or by consumers through elevated prices rather than shareholders. The chapter synthesizes the fundamental trade-off between equity and efficiency: progressive tax structures advancing fairness goals frequently generate larger economic distortions, while regressive or proportional systems may minimize inefficiency but sacrifice redistributive objectives. Historical evolution of U.S. tax policy, from efficiency-focused reductions in earlier decades to later emphasis on vertical equity through progressive structures, demonstrates how political values shape the balance between these competing priorities.