Action Overview

The Section 301 investigation, initiated in August 2017, found that China employs unreasonable or discriminatory acts, policies, and practices related to technology transfer, intellectual property, and innovation. The United States Trade Representative imposed additional duties in four tranches (Lists 1-4A) between 2018 and 2019. The 2024 Four-Year Review concludes that the existing tariffs should remain and proposes substantial increases targeting strategic sectors where China seeks dominance. Since inception, U.S. Customs and Border Protection has assessed more than $200 billion in Section 301 duties.

Existing Tariff Structure

List 1 imposes a 25% additional duty on 818 tariff subheadings with approximately $34 billion in annual trade value, effective July 6, 2018. List 2 adds 25% duties on 279 subheadings covering $16 billion in trade. List 3, the largest tranche, covers 5,745 subheadings and $200 billion in trade, initially at 10% and raised to 25% on May 10, 2019. List 4A covers an additional $300 billion in trade, originally at 15% and reduced to 7.5% as part of the 2019 Phase One Agreement. These four lists together cover roughly two-thirds of U.S. imports from China.

Proposed 2024 Modifications: Strategic Sectors

The USTR proposes adding or increasing tariffs in 14 strategic sectors targeted by China's 'new three' growth strategy and U.S. domestic investment priorities. Headline increases include 100% on electric vehicles, 50% on semiconductors and solar cells (including solar wafers), and 25% on lithium-ion EV and non-EV batteries, battery parts, natural graphite, permanent magnets, critical minerals, and ship-to-shore cranes. Steel and aluminum products face new 25% duties. Medical supplies including surgical gloves, N95 facemasks, and syringes also face new or increased duties of 25-50%. These increases complement investments under the Inflation Reduction Act, CHIPS and Science Act, and Bipartisan Infrastructure Law.

Economic and Strategic Findings

Economic analysis in the review estimates aggregate U.S. GDP impact from tariffs at approximately 0.13%. China's share of U.S. imports has declined across all four lists — notably -12.0 percentage points on List 3 products since 2017 — with diversification toward USMCA partners (+6.4pp on List 3), ASEAN, and EU 27 countries. Flaaen and Pierce (Federal Reserve Board) found short-run impacts of manufacturing employment reductions and producer price increases. The review also proposes a targeted exclusion process for 8-digit tariff lines under HTSUS Chapters 84 and 85 (machinery used in domestic manufacturing), plus 19 temporary exclusions for solar manufacturing equipment.