Section 301 Tariffs: A Complete Guide for US Importers

Section 301 tariffs have reshaped the economics of importing from China more than any trade policy change since the 1980s. Since 2018, they've added 7.5%–25% to the cost of roughly $370 billion worth of annual imports — covering everything from semiconductors to furniture to clothing.

This guide explains what Section 301 tariffs are, which products they hit, how rates are set, and what practical options importers have to manage their exposure.

What Is Section 301?

Section 301 of the Trade Act of 1974 authorizes the US Trade Representative (USTR) to investigate and respond to "unfair, unreasonable, or discriminatory" foreign trade practices. It had been used occasionally over the decades, but the 2018–2020 China investigation resulted in the largest Section 301 action in history.

The USTR found that China's trade practices — forced technology transfer, intellectual property theft, discriminatory licensing, and state-sponsored industrial espionage — were causing material harm to US companies. The result was a cascade of tariff lists covering virtually all Chinese-manufactured goods.

These are not standard customs duties. They are additional tariffs that stack on top of whatever base duty rate already applies to the HTS code.

The Four Lists

List 1 — $34 Billion: Industrial Products (25%)

Effective July 6, 2018. This list targeted capital goods and industrial inputs where the USTR determined the least consumer impact. Think: aerospace components, industrial machinery, pressure equipment, machine tools, motor vehicle parts, and medical devices.

List 2 — $16 Billion: Technology and Intermediate Goods (25%)

Effective August 23, 2018. Expanded the scope to semiconductors, chemicals, plastics, electric motors, and more industrial goods. Like List 1, consumer products were largely excluded at this stage.

List 3 — $200 Billion: Broad Industrial and Consumer Goods (25%)

Originally imposed at 10% in September 2018, then raised to 25% in May 2019. This was the pivotal expansion — List 3 covers a huge swath of Chinese exports including electronics, furniture, luggage, food products, chemicals, auto parts, and construction materials.

List 4A — $120 Billion: Consumer Goods (7.5%)

Effective February 14, 2020. List 4A covers consumer electronics, clothing, footwear, and other retail goods. The rate was set at 7.5% rather than 25% in recognition of the direct consumer price impact. List 4B — which would have covered the remainder — was never implemented.

How to Check If Your Product Is Covered

Section 301 applicability is determined at the 8-digit HTS level, not the 10-digit level. The USTR published each list as a set of 8-digit HTS codes.

The practical check:

Find your product's 10-digit HTS code
Take the first 8 digits
Search the USTR Section 301 lists for that 8-digit code

Resources to check: USTR's Section 301 docket, and databases maintained by law firms and customs brokers that have compiled the full list into searchable form.

Tools like TariffClassify return Section 301 applicability automatically when you classify a product — you see the list, the rate, and the combined total duty burden alongside the base HTS rate.

How Section 301 Stacks With Other Tariffs

This is where importers are frequently surprised. Section 301 tariffs do not replace the base customs duty — they add to it. And with the introduction of IEEPA tariffs, the stacking problem has become more severe.

Example — Chinese-origin industrial pump (HTS 8413.70.2004):

Duty component	Rate	Amount on $100,000 shipment
Base HTS duty	3.0%	$3,000
Section 301 (List 1)	25.0%	$25,000
IEEPA baseline	10.0%	$10,000
MPF	0.3464%	$346
Total	38.3%+	$38,346

A product that cost $100,000 to import before 2018 now requires over $38,000 in duties alone. That's the arithmetic that has driven so many supply chain shifts away from China.

Section 301 Exclusions: What Happened

The USTR established an exclusion process that allowed US companies to petition for product-specific exclusions — essentially a waiver of Section 301 tariffs for a defined HTS subheading. Thousands of exclusions were granted.

However, most exclusions have since expired. The exclusion process has been politically contentious, and renewal has been inconsistent. As of 2026, very few active exclusions remain. If you believe your product qualifies for an exclusion, check the USTR database and consult a trade attorney — the exclusion landscape changes with each administration.

Strategies for Managing Section 301 Exposure

1. Tariff engineering at the design stage

Some manufacturers have modified product specifications, assembly sequences, or component sourcing to shift classification to a heading not covered by Section 301. This is legitimate if the product genuinely meets the new classification — but must be done carefully. CBP audits for "tariff engineering" that lacks commercial substance.

2. Country of origin shifting

Substantial transformation in a third country can change the origin of a product, removing it from Chinese-origin Section 301 treatment. "Substantial transformation" requires a change in character, use, or name resulting from processing — not mere finishing or assembly of Chinese-made parts.

CBP has issued detailed guidance on what constitutes substantial transformation for various product categories. Vietnam, Mexico, India, and Thailand have all received major manufacturing investment driven in part by this dynamic. But CBP actively investigates country-of-origin fraud — transshipment through a third country without genuine manufacturing is illegal and heavily penalized.

3. First sale valuation

US customs duties are assessed on the "transaction value" — typically the price paid by the importer to the foreign seller. Under first sale valuation, if goods pass through an intermediary (a trading company) before the importer, the importer can petition to use the first sale price — the price the factory charged the trading company, which is lower.

This doesn't eliminate Section 301, but it reduces the dutiable base. A $1M shipment bought through a trading company for $1.2M could be valued at $1M for duty purposes, saving 20% on Section 301 and all other duties.

4. Foreign trade zones (FTZs)

Goods admitted to a Foreign Trade Zone are not considered "imported" for customs purposes until they leave the FTZ. If the goods are manufactured or substantially transformed within the FTZ, they may lose their Chinese origin. More practically, FTZs allow you to defer duty payment, which improves cash flow on high-value shipments.

5. Bonded warehouses and duty deferral

Importing into a bonded warehouse allows you to defer duty payment until the goods are withdrawn for consumption. This is primarily a cash flow tool, not a duty reduction strategy.

6. Renegotiating supplier pricing

Many Chinese suppliers have already absorbed some Section 301 cost to remain competitive. The tariff burden has been split between US importers, Chinese exporters (through lower margins), and US consumers (through higher prices). If you haven't explicitly negotiated the Section 301 line item with your suppliers, it's worth the conversation.

What Importers Get Wrong About Section 301

Assuming the HTS code is someone else's problem. Your customs broker files the entry, but legal liability for misclassification rests with the importer of record. If CBP determines your product belongs on a Section 301 list and you've been claiming it doesn't, you face the unpaid duty plus penalties and interest.

Not accounting for Section 301 in product costing. Buying teams sometimes use landed cost estimates that don't include Section 301 because "the broker handles it." The result is systematically underestimated costs and compressed margins.

Assuming exclusions still apply. Many importers received exclusions in 2019–2021 and assumed they were permanent. The vast majority have expired. If you're still operating as if an expired exclusion applies, you're underpaying duties.

The Current Political Landscape

Section 301 tariffs have proven durable across two administrations. The Biden administration conducted a statutory four-year review and largely maintained the tariff structure, raising rates on a subset of strategic goods (electric vehicles, solar cells, lithium-ion batteries, steel and aluminum) in 2024. The Trump administration has maintained Section 301 while also adding IEEPA tariffs on top.

The tariff environment will continue to evolve — monitor the USTR website and subscribe to updates from your customs broker. Rates and coverage that applied when you set up your supply chain may no longer be current.

Key Takeaways

Section 301 tariffs add 7.5%–25% to nearly all Chinese-origin manufactured goods on top of the base HTS rate
Coverage is at the 8-digit HTS level — verify every product you import
Most exclusions have expired — don't assume you're still exempt
With IEEPA stacking on top, effective tariff rates on Chinese goods can exceed 50%
Mitigation options (tariff engineering, FTZs, first sale, origin shifting) are real but require careful legal analysis

TariffClassify automatically checks Section 301 applicability and shows your full combined duty burden — base rate, Section 301, IEEPA, and AD/CVD — for every product you classify. Try it free.