What Is a Section 301 Tariff? Complete Guide for Importers (2026)

If you import goods from China, you have almost certainly paid a Section 301 tariff — even if nobody explained what it actually is or why your customs broker's invoice suddenly jumped. Section 301 is the single biggest driver of import cost increases for US-China trade since 2018, and it now touches thousands of HS codes across nearly every product category.

This guide explains what Section 301 actually is, how the tariff lists work, how it differs from other US tariff authorities, and how to check whether your specific product is affected — plus what your options are if it is.

What Is Section 301, Legally Speaking?

Section 301 refers to a provision of the US Trade Act of 1974. It authorizes the Office of the US Trade Representative (USTR) to investigate and respond to foreign trade practices considered "unreasonable or discriminatory" and burdensome to US commerce. Once an investigation confirms such practices, the President can authorize retaliatory measures — most commonly, additional import tariffs.

In August 2017, USTR opened a Section 301 investigation into China's technology transfer, intellectual property, and innovation policies. The investigation concluded that China's practices were indeed harmful to US interests, and the first tariffs were announced in 2018. Unlike routine customs duties, these tariffs exist entirely outside the normal tariff schedule — they are layered on top of whatever standard duty already applies to a product.

How the Tariff Lists Were Built

USTR did not apply Section 301 tariffs to all Chinese goods at once. Instead, it rolled them out in stages, commonly referred to as "Lists," each covering a different set of HS codes:

Source: USTR Section 301 Tariff Actions · rates have been adjusted multiple times since original announcement, always verify current rates

Since the original four lists, USTR has periodically added, removed, or increased rates on specific tariff lines — most notably raising rates sharply on EVs, batteries, solar cells, semiconductors, and select steel and aluminum products during subsequent policy reviews. This means two importers bringing in different HS codes from China today can face very different effective rates, even within the same broad product category.

Section 301 vs. Other US Tariff Authorities

Section 301 is not the only tool the US government uses to impose extra tariffs. Importers often confuse it with other mechanisms that work differently and apply to different situations:

The practical difference for importers: Section 301 tariffs are tied to specific HS codes and specific countries of origin (mainly China), while Section 232 and IEEPA tariffs can apply more broadly regardless of origin country. It's possible for a single shipment to be subject to more than one of these simultaneously — for example, a steel product from China could face both Section 232 steel tariffs and Section 301 China tariffs stacked together.

How to Check If Your Product Is Affected

Because Section 301 applies at the HS code level, not the product category level, the only reliable way to know if you're affected is to check your exact 8-to-10-digit HS classification against the current tariff lists. Here's the practical process:

1. Confirm your HS code. If you're not certain of your product's correct classification, use a lookup tool or consult your customs broker — misclassification is a common (and costly) compliance risk on its own.
2. Check the current USTR exclusion and inclusion lists. USTR publishes the full list of HS codes subject to each tranche, along with any active exclusions, on its official site.
3. Check with your customs broker or freight forwarder. Most brokers maintain updated internal databases and can confirm your applicable rate before you commit to an order.
4. Model the total landed cost impact. Section 301 tariffs stack on top of the standard Most Favored Nation (MFN) duty rate — so your effective rate is MFN + Section 301, not just the Section 301 percentage alone.

Can You Get an Exclusion?

USTR has, at various points, opened exclusion request windows allowing importers to petition for a specific HS code (or even a specific product description) to be temporarily exempted from Section 301 tariffs. Exclusions are typically granted when:

• The product is not available from a non-Chinese source in sufficient quantity or quality
• The tariff would cause severe economic harm to the requesting business or US interests broadly
• The product is not central to the industrial policy concerns that motivated the original tariff

Exclusion requests are submitted through USTR's public docket process, are open for public comment, and typically take several months for a decision. Approved exclusions are usually granted for a limited period and must be renewed. Given the time and uncertainty involved, most small and mid-sized importers treat exclusions as a possible upside rather than a planning assumption.

What This Means for Your Sourcing Strategy

Section 301 has been in place since 2018 and has survived two changes of administration with its core structure intact — even as specific rates and exclusions have shifted. For importers, the practical lesson is not to treat current rates as temporary noise, but as a structural cost that should be built into sourcing decisions from the start:

• Always calculate landed cost using the current effective rate for your exact HS code — not a category-level assumption.
• Re-check rates periodically; USTR reviews and adjusts specific tariff lines more often than most importers expect.
• Build a comparison model against at least one alternative sourcing country before signing a new supplier contract, even if you don't plan to switch immediately.