This prediction market asks whether the top federal corporate income tax rate in the United States will be reduced below 21% before January 1, 2027. The current top rate of 21% was set by the Tax Cuts and Jobs Act (TCJA) of 2017, which President Donald Trump signed into law on December 22, 2017. The market resolves to Yes if any legislation enacted by the end of 2026 lowers the top statutory rate for corporations below 21%, even if the reduction applies only to future tax years. Changes to the corporate tax base, deductions, credits, or other tax attributes do not count. The focus is strictly on the top marginal rate applied to corporate income. Corporate tax rates have been a central issue in U.S. tax policy debates for decades. Proponents of lower corporate rates argue they stimulate investment, boost wages, and make the U.S. more competitive globally. Critics contend they reduce government revenue, increase inequality, and encourage profit shifting abroad. The TCJA cut the top rate from 35% to 21%, a reduction of 14 percentage points, and the rate has remained at 21% since 2018. President Trump, in his 2024 campaign platform, proposed further cuts, including a potential reduction to 15% for domestic manufacturers. As of early 2025, the political landscape is uncertain. The 2024 election resulted in a divided Congress, with Republicans controlling the House of Representatives by a narrow margin and Democrats holding a slim majority in the Senate. Any tax legislation would require 60 votes in the Senate to overcome a filibuster, unless passed through budget reconciliation, which only needs a simple majority. The TCJA's individual tax provisions are set to expire at the end of 2025, creating a legislative vehicle for broader tax reform. Whether a corporate rate cut can be attached to that package is a key question. Interest in this market is driven by the potential economic and political consequences of a rate change. Investors, businesses, and policymakers are watching closely because corporate tax policy affects stock prices, business investment decisions, and federal deficits. The outcome also has implications for international tax competition, as other countries have been lowering their corporate rates. The market provides a real-time probability estimate of a specific legislative outcome, aggregating the views of traders who have financial incentives to be well-informed.

Historical Context

The U.S. corporate income tax rate has fluctuated significantly over the past century. The top rate was as high as 52.8% in 1969 under the Tax Reform Act of 1969, which combined a 48% normal tax with a 4.8% surcharge. The Tax Reform Act of 1986, signed by President Ronald Reagan, reduced the top rate from 46% to 34%, a major simplification that also broadened the tax base by eliminating many deductions. In 1993, President Bill Clinton raised the top rate to 35% as part of the Omnibus Budget Reconciliation Act, where it remained for 24 years. The most recent major change was the Tax Cuts and Jobs Act of 2017, which President Trump signed into law on December 22, 2017. The TCJA permanently reduced the top corporate rate from 35% to 21%, a 14-percentage-point cut. It also moved the U.S. from a worldwide tax system to a territorial system, exempting most foreign profits from U.S. tax. The Joint Committee on Taxation estimated the corporate rate cut would reduce federal revenue by $1.3 trillion over ten years. The TCJA passed through budget reconciliation, requiring only a simple majority in the Senate, with no Democratic votes in either chamber. Since 2018, the 21% rate has remained unchanged. President Biden proposed raising the rate to 28% in his 2021 American Jobs Plan, but that did not pass. The Inflation Reduction Act of 2022 introduced a 15% minimum tax on book income for large corporations but did not change the statutory rate. The TCJA's individual income tax provisions are scheduled to expire at the end of 2025, creating a significant legislative event that could be used to attach corporate tax changes. The Congressional Budget Office projects that extending the TCJA's individual provisions would cost about $3.5 trillion over ten years, making it a politically charged negotiation.

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