The original tax-swap bargain that was implemented within a decade had promising intentions, but unfortunately, both elements of the agreement eventually collapsed. Initially, Congress believed that income taxes would generate less revenue compared to the old tariff system they replaced. However, they quickly realized that income taxes were far more lucrative, especially during times of crisis such as U.S. entry into World War I. This led to a significant increase in the top marginal tax rate, reaching as high as 77 percent in 1918.
Efforts to control the income tax were made in the 1920s, but subsequent presidents like Hoover and Roosevelt raised the top tax rates even further. What started as a tax on only high-income earners in 1913 eventually transformed into a mass tax that affected most American families by 1942. On the other hand, the protectionist-dominated Republican Party also played a role in restoring higher average tariff rates in 1920 and implementing the infamous Smoot-Hawley Tariff in 1930, which triggered a global trade war.
The repercussions of this failed tax swap were felt for decades, prompting Congress to relinquish its trade policy oversight to the State Department in 1934. The liberalization of the global economy post-World War II was facilitated through treaties and trade agreements, which are crucial for maintaining international relations. However, the threat of reverting back to protectionist measures like the Smoot-Hawley schedule still looms, especially if current leaders choose to disregard free trade obligations with other countries.
David R. Henderson and Phillip W. Magness delve deeper into this topic in their article, “Don’t Substitute Tariffs for Income Taxes: You’ll Get Both,” published in the National Review on January 28, 2025. Their insights shed light on the historical context and potential consequences of mixing tariffs and income taxes. For a comprehensive understanding of the subject, it is recommended to read the full article, which provides valuable insights into this complex issue.
