US Tariff Rate Changes — March 2026

March 2026 has been an active month for US tariff rate changes. Between Federal Register orders, ongoing trade remedy proceedings, and periodic updates to the Harmonized Tariff Schedule, importers across multiple sectors are dealing with shifting duty rates that directly affect landed costs. Here is a summary of the key activity and what it means for your supply chain.

Section 301 Tariff Reviews Continue to Reshape China Duties

The Office of the United States Trade Representative (USTR) continues its multi-year review of Section 301 tariffs on goods of Chinese origin. These tariffs, originally imposed in 2018 and 2019 across four tranches (Lists 1 through 4A), have undergone several rounds of exclusion, reinstatement, and modification since their inception.

In March 2026, additional modifications have been published affecting product categories under Chapters 84 and 85 of the Harmonized Tariff Schedule — covering machinery, mechanical appliances, electrical equipment, and electronics. Importers sourcing semiconductors, printed circuit board assemblies, electric motors, and consumer electronics from China should pay close attention. Rate adjustments in these chapters can shift effective duty rates by several percentage points, which at scale translates to significant cost impact.

Chapter 39 (plastics) and Chapter 94 (furniture) have also seen activity this month as USTR continues to evaluate exclusion requests and determine which product lines warrant continued tariff coverage. The review process involves public comment periods and interagency deliberation, meaning changes can arrive in waves rather than all at once.

If you import goods classified under any of the original Section 301 lists, now is the time to verify whether your specific HTS codes have been affected by the latest Federal Register notices.

Anti-Dumping and Countervailing Duty Determinations

Anti-dumping (AD) and countervailing duty (CVD) proceedings remain one of the most frequent sources of tariff rate changes for US importers. The Department of Commerce and the US International Trade Commission (USITC) issue preliminary and final determinations on a rolling basis, and March 2026 has been no exception.

Steel and aluminum products — particularly those classified under Chapters 72 and 73 — continue to be heavily targeted. Administrative reviews of existing AD/CVD orders can result in revised duty deposit rates for specific manufacturers and exporters, sometimes dramatically. An importer who was depositing duties at 5% last year may find that rate adjusted to 15% or higher following a new review period.

Beyond metals, the chemicals sector (Chapter 28 and Chapter 29) and solar energy components (Chapter 85) have seen ongoing trade remedy activity. Preliminary determinations in these categories can impose provisional duties that take effect almost immediately, catching unprepared importers off guard.

The key takeaway: AD/CVD rates are not static. They change with every administrative review cycle, and the effective rate depends on which specific foreign producer or exporter supplied your goods. Staying current on these determinations is essential for accurate duty estimation and compliance.

USITC Harmonized Tariff Schedule Updates

The Harmonized Tariff Schedule of the United States (HTSUS) is not a fixed document. The USITC publishes revisions throughout the year to reflect legislative changes, presidential proclamations, and technical corrections. Even seemingly minor updates — a reclassification of a product from one subheading to another, or a change in a statistical suffix — can alter the applicable duty rate.

March 2026 has brought schedule updates across several chapters. Some reflect the implementation of trade agreement modifications. Others are technical corrections that realign US classifications with the World Customs Organization's Harmonized System amendments.

For importers, the practical risk is straightforward: if you are relying on an HTS classification from six months ago, it may no longer be accurate. A product that was duty-free under one subheading could now fall under a dutiable classification, or vice versa. Customs brokers typically catch these shifts, but the further upstream you identify a classification change, the better you can manage its impact on pricing and sourcing decisions.

What Importers Should Do Now

With this much activity across multiple tariff change sources, importers should take a few concrete steps:

• Audit your HTS classifications. Pull your most recent entry summaries and verify that every HTS code you use is still current. Cross-reference against the latest HTSUS revision published by the USITC.

• Recalculate landed costs. If any of your duty rates have changed — whether from a Section 301 modification, an AD/CVD administrative review, or a schedule reclassification — update your landed cost models immediately. Margin erosion from untracked duty increases is one of the most common and preventable problems in import operations.

• Monitor proactively, not reactively. The Federal Register publishes new tariff-related notices almost daily. The USITC updates its schedule on an ongoing basis. Manually tracking these sources is time-consuming and error-prone. Automated monitoring gives you early warning before a rate change hits your bottom line.

• Consult your broker or trade counsel. If you suspect a classification change affects your products, get a professional opinion before your next shipment clears customs. Voluntary disclosure of past misclassification is far less costly than a CBP audit finding.

Stay Ahead of Tariff Changes with ImportSignal

ImportSignal monitors the Federal Register and the USITC Harmonized Tariff Schedule every night. When a rate change affects one of your HTS codes, you get an alert — not days or weeks later, but the morning after it is published.

Upload your catalog of HTS codes, and ImportSignal does the rest: tracking Section 301 modifications, AD/CVD determinations, schedule updates, and any other published rate change that touches your products.

Start your free trial and stop finding out about duty rate changes after they have already cost you money.

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Related Reading

• What Is an HTS Code? A Plain-English Guide — Everything importers need to know about HTS codes, how they're structured, and why classification matters.
• US Import Tariff Glossary — Definitions of key trade terms including HTS, AD/CVD, Section 301, Section 232, and more.
• How to Track Tariff Changes on Your Imports — A complete guide to why US duty rates change and what a reliable monitoring system looks like.
• What Happens When Tariff Rates Change Mid-Shipment — Learn how CBP determines which rate applies when duties change while your goods are on the water.