United States-China tariff conflict and Phase One agreement (2018-2020)

The United States-China tariff conflict and Phase One agreement (2018-2020) combined United States Section 301 tariffs, Chinese retaliation and a negotiated managed-trade settlement. The campaign produced bounded commitments and stopped part of the planned escalation, but most additional tariffs remained, purchase commitments were missed and the central structural dispute persisted. Tariff costs also fell through both economies rather than transferring cleanly from sender to target.

Section 301 continuation and review status current to 29 July 2026. Live sources require rechecking within 24 hours of publication.

Section 301 and reciprocal tariffs

The Office of the United States Trade Representative opened its Section 301 investigation in August 2017. Its report of 22 March 2018 found that specified Chinese practices concerning technology transfer, intellectual property and innovation were unreasonable or discriminatory and burdened United States commerce. Those are findings of the United States authority. China's denials and legal position remain separate.

United States tariffs took effect in tranches. List 1 applied 25 per cent duties to approximately US$34 billion of covered imports from 6 July 2018. List 2 applied 25 per cent duties to approximately US$16 billion from 23 August. List 3 applied 10 per cent duties to approximately US$200 billion from September 2018 and rose to 25 per cent in May 2019. List 4 measures applied later in 2019, with planned and implemented parts requiring separate treatment.

These figures describe approximate trade coverage when the measures were announced. They are not customs revenue, Chinese loss or current import value. Each tranche also had tariff lines, exclusions, modifications and effective dates defined by its Federal Register notice.

China retaliated through its own tariff schedules. Its covered import base, rates and product lists differed, so it did not match every United States action dollar for dollar. Agriculture was heavily exposed. Political targeting can be inferred from product geography and incidence only where the evidence supports it; it was not automatically an official Chinese legal criterion.

Incidence and domestic adjustment

Customs duties are paid by importers of record at entry. Their eventual burden can fall on importers, foreign suppliers, downstream firms, retailers, workers or consumers depending on pass-through, contracts and adjustment. Empirical studies found substantial United States incidence, with results varying between border and retail prices and across sectors.

United States agricultural exporters faced lost demand and diversion. Federal support through the Market Facilitation Program and related trade-mitigation measures shifted part of the cost to the budget. Authorised support, actual payments, producer losses and long-term market-share changes are different quantities.

The tariff conflict also changed sourcing patterns. Trade diversion through third countries does not by itself prove either decoupling or evasion. It can reflect legitimate supply-chain adjustment, rerouting, processing and changes in comparative cost.

Phase One and the legal epilogue

The parties signed the Economic and Trade Agreement on 15 January 2020, and it entered into force on 14 February. Phase One contained chapters on intellectual property, technology transfer, agriculture, financial services, macroeconomic policy and transparency, purchases and dispute resolution. It reduced or suspended parts of the planned escalation but left most additional tariffs in place.

The purchase commitments covered 2020 and 2021 above 2017 baselines. Chad Bown's final tracker found substantial underperformance using its defined series. That assessment is an analytical measurement, not an adjudicated breach finding. The pandemic, baseline design, demand and implementation all form part of the causal record.

The World Trade Organization panel in DS543 circulated its report on 15 September 2020. The United States appealed in October into a non-functioning Appellate Body. The report was not adopted and should not be described as a final binding Dispute Settlement Body ruling.

The Section 301 actions continued after USTR's 2024 review. USTR initiated the second four-year review on 6 May 2026. Those actions remain legally distinct from Section 232 metals measures, Entity List controls, semiconductor export controls and the later IEEPA tariff programme.

See also

Section 301, Trade Act (1974) · Section 232, Trade Expansion Act (1962) · Tariff as coercive instrument · Economic coercion · IEEPA tariff war and the Supreme Court challenge (2025-2026) · Huawei Entity List and FDPR campaign (2019-present) · October 2022 semiconductor export controls · Economic Kill Chain (EKC)

Sources

• Office of the United States Trade Representative, 'Investigation: Technology Transfer, Intellectual Property, and Innovation', including initiation on 24 August 2017 and report of 22 March 2018.
• Office of the United States Trade Representative, Federal Register notices for List 1, List 2, List 3 and List 4 (2018-2019).
• Customs Tariff Commission of the State Council of China, announcements of additional tariffs on United States products (2018-2020).
• United States and China, Economic and Trade Agreement between the United States of America and the People's Republic of China, signed 15 January 2020 and effective 14 February 2020.
• Office of the United States Trade Representative, 'Bilateral Evaluation and Dispute Resolution Office' (14 February 2020).
• World Trade Organization, 'United States, Tariff Measures on Certain Goods from China, DS543'.
• World Trade Organization Panel, United States, Tariff Measures on Certain Goods from China, WT/DS543/R (15 September 2020).
• Office of the United States Trade Representative, Four-Year Review of Actions Taken in the Section 301 Investigation (14 May 2024).
• Office of the United States Trade Representative, 'Four-Year Review' (current page checked 29 July 2026).
• United States International Trade Commission, Economic Impact of Section 232 and 301 Tariffs on U.S. Industries, Publication 5405 (March 2023).
• Mary Amiti, Stephen J. Redding and David E. Weinstein, 'The Impact of the 2018 Tariffs on Prices and Welfare', Journal of Economic Perspectives 33, no. 4 (2019): 187-210.
• Pablo D. Fajgelbaum, Pinelopi K. Goldberg, Patrick J. Kennedy and Amit K. Khandelwal, 'The Return to Protectionism', Quarterly Journal of Economics 135, no. 1 (2020): 1-55.
• Alberto Cavallo, Gita Gopinath, Brent Neiman and Jenny Tang, 'Tariff Pass-Through at the Border and at the Store: Evidence from US Trade Policy', American Economic Review: Insights 3, no. 1 (2021): 19-34.
• Chad P. Bown, 'US-China Phase One Tracker: China's Purchases of US Goods', Peterson Institute for International Economics (final 2022 update).
• United States Department of Agriculture, reports on the Market Facilitation Program and trade-mitigation payments (2018-2020).