Why It's Not The "Super-Rich" That Will Pay For The Left's "Radical" Tax Plans

Via DataTrekResearch.com,

US individual income tax rates have become an important topic of debate in American politics, with both members of the new Democrat-controlled House and presidential hopefuls pitching changes to the status quo. There is, for example, talk of a 70% marginal tax rate for income above $10 million. One recent survey even showed the majority of Americans favor that idea, so there seems to be plenty of political air cover for a rethink of Federal income taxes.

Since this is the Data section, let’s look at 2 sets of numbers that should inform US tax policy.

Point #1: The history of Federal tax receipts as a percent of US GDP. This measures how various US individual/corporate tax regimes have altered the ability of the Federal government to increase revenue relative to the size of the US economy. A few points here:

  • Even though the highest marginal individual/corporate tax rates have varied widely since World War II (from 50% - 90% in the 1940s/1950s to 21% - 37% now), total tax receipts as a percent of GDP have been remarkably stable.

  • The average tax receipt/GDP ratio from 1968 to 2017 is 17.1%. Every dollar of GDP creates 17 cents of Federal individual/corporate taxes.

  • This ratio was 17.0% in 2017 (latest data available). The current cycle peak was 17.8% in 2015.

  • History shows that economic growth does far more to increase tax collection than changes in the tax code. The post-World War II high for tax collections/GDP was in 2000, at 19.8%. The low water mark was 14.4% in 2010.

The upshot here: tax rates ebb and flow, but the historical record shows they don’t fundamentally shift the amount of money collected by the Federal government relative to the total “pie” that is the US economy.

Point #2: The number of US households making over $10 million/year in income, the most commonly mentioned threshold in the current political debate over “taxing the super rich”. Data on this cohort from the 2016 tax year (latest available at a sufficiently granular level), according to the US Internal Revenue Service:

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