Section 301 vs Section 232 vs IEEPA Tariffs: What's the Difference?

If you import into the United States, you have probably seen three acronyms thrown around as if they were interchangeable: Section 301, Section 232, and IEEPA. They are not. Each comes from a different statute, each is triggered by a different policy rationale, and each applies to a different slice of your imports. Confusing them is one of the fastest ways to mis-budget a shipment — or to assume a tariff applies when it does not.

This guide breaks down all three in plain language: what each one is, how they differ, how they stack on a single product, and how to tell which apply to your goods. Rates and program scope change frequently, so everything below is described as current as of June 2026 — always confirm against the live schedule before you file.

What is a Section 301 tariff?

Section 301 comes from the Trade Act of 1974. It gives the U.S. Trade Representative (USTR) the authority to respond to a foreign country's trade practices that are judged unfair, discriminatory, or burdensome to U.S. commerce. In practice, when most importers say "Section 301" they mean the tariffs imposed on goods of Chinese origin in response to findings about intellectual-property and technology-transfer practices.

The defining feature of Section 301 is that it is origin-specific to China and applied by product "List." USTR published tranches of goods — commonly referenced as List 1, List 2, List 3, and List 4A — each covering thousands of HTS subheadings. As of June 2026, List 1 through List 3 goods are commonly dutied at 25%, List 4A goods at 7.5%, and certain targeted actions reach as high as 100% (electric vehicles being the headline example, alongside elevated rates on items like solar cells, semiconductors, and some medical products).

Because Section 301 is keyed to origin, the same physical product made in Vietnam or Mexico carries no Section 301 duty at all — which is why sourcing decisions are worth so much money and why customs scrutinizes transshipment so aggressively. Our companion guide on how to calculate import duty from China walks through a full worked example of the stack.

What is a Section 232 tariff?

Section 232 comes from the Trade Expansion Act of 1962. It authorizes tariffs (or other restrictions) when the Department of Commerce finds that imports of a product threaten to impair national security. Unlike Section 301, the rationale here is not retaliation for unfair trade — it is protecting a domestic industry deemed strategically essential.

The two best-known Section 232 actions are the tariffs on steel and aluminum, which have stood at 25% for steel and have applied to aluminum and to a growing list of derivative products — items that contain steel or aluminum as a major input, such as certain fasteners, tubing, and fabricated components. As of June 2026, the derivative coverage has expanded well beyond raw mill products, which catches many importers by surprise.

The critical distinction is scope: Section 232 is product-based and broad across origins — it does not single out one country the way Section 301 does, though specific country exemptions, quotas, and arrangements have come and gone over the years. Where Section 301 asks "is it from China?", Section 232 asks "is it steel or aluminum (or a derivative)?"

What is an IEEPA tariff?

IEEPA stands for the International Emergency Economic Powers Act of 1977. It lets the President regulate international commerce after declaring a national emergency with respect to an unusual and extraordinary threat. Historically IEEPA was used for sanctions and asset freezes; more recently it has been used as the legal basis for broad "reciprocal" tariffs imposed by executive action rather than through the slower USTR or Commerce investigation processes.

The defining feature of IEEPA tariffs is that they are origin-specific and set country by country. Rather than targeting a product category, an IEEPA action assigns a tariff rate to imports from a given country — and those rates are often layered in the 10–20% range, with some trading partners higher or lower depending on the state of negotiations. Because they rest on an emergency declaration, they can be announced, adjusted, paused, or escalated quickly, which makes them the most volatile of the three programs.

The practical upshot is that IEEPA can attach a meaningful tariff to goods from countries with no Section 301 exposure at all — a product sourced out of China to avoid the 301 duty may still pick up an IEEPA reciprocal tariff in its new origin. The savings are usually still substantial, but the analysis is no longer "China bad, everywhere else free."

Key differences at a glance

If you remember nothing else, remember what triggers each program and what it keys on. Here is the comparison laid out point by point:

• Legal authority. Section 301 = Trade Act of 1974 (USTR). Section 232 = Trade Expansion Act of 1962 (Commerce). IEEPA = International Emergency Economic Powers Act of 1977 (President, via emergency declaration).
• Policy rationale. Section 301 = retaliation for unfair foreign trade practices. Section 232 = national-security protection of a strategic domestic industry. IEEPA = response to a declared national emergency / reciprocal trade leverage.
• What it keys on. Section 301 keys on country of origin (China) plus product List. Section 232 keys on product (steel, aluminum, and derivatives) and is broad across origins. IEEPA keys on country of origin, assigned per trading partner.
• Typical rates (June 2026). Section 301 = 7.5% (List 4A) and 25% (Lists 1–3), up to 100% on targeted goods. Section 232 = 25% on steel and aluminum and covered derivatives. IEEPA = reciprocal tariffs commonly layered at 10–20% by country.
• Origin behavior. Move sourcing out of China and you generally shed Section 301 entirely. Section 232 follows you to most origins if the product is still steel or aluminum. IEEPA depends on the rate assigned to the new origin country.
• Stability. Section 232 and Section 301 move through formal investigation and review processes and tend to be relatively durable. IEEPA tariffs rest on an emergency declaration and can change the fastest.

How they stack on the same product

Here is the part that trips people up: these are not mutually exclusive. A single import can be subject to two or even all three programs at once, and each one is calculated as an additional ad valorem duty on top of the most-favored-nation (MFN) base rate from the HTSUS. They do not replace each other — they stack.

Picture an aluminum-bodied product made in China. It can owe the MFN base duty from its HTS code, plus a Section 301 duty because it is Chinese-origin and falls on a covered List, plus a Section 232 duty because it contains aluminum as a covered derivative, plus an IEEPA reciprocal tariff because China carries one. Layer in the Merchandise Processing Fee (MPF) at 0.3464% (minimum $33.58, maximum $651.50 per entry) and, for ocean shipments, the Harbor Maintenance Fee (HMF) at 0.125%, and the effective rate can climb far above any single headline number.

1. MFN base duty — the ad valorem rate listed against your HTS code in the HTSUS (0% to 30%+).
2. Section 301 — added if the good is Chinese-origin and on a covered List.
3. Section 232 — added if the good is steel, aluminum, or a covered derivative, largely regardless of origin.
4. IEEPA reciprocal — added based on the rate assigned to the country of origin.
5. MPF + HMF — federal user fees that apply to almost every formal entry (HMF ocean-only).

Which one applies to my goods?

You can usually narrow it down with three questions, answered in order:

1. What is the country of origin? If it is China, assume Section 301 is in play until you confirm your HTS subheading is on a covered List. Non-China origins generally shed Section 301 entirely.
2. Is the product steel, aluminum, or a derivative of either? If yes, screen for Section 232 — and check the derivative list carefully, because coverage now reaches many fabricated and component products, not just raw mill goods.
3. Does the origin country carry an IEEPA reciprocal tariff? This changes the fastest, so confirm the current rate for that specific country before you commit to a sourcing plan or quote a landed cost.

Why the distinction matters for your bottom line

Knowing which program applies is not academic — it directly drives your sourcing strategy and your cash. Because Section 301 and IEEPA are origin-driven, the lever you pull is *where you make the goods*. Shifting production from China can erase the entire 301 layer, though you then have to check the IEEPA rate of the new origin. Because Section 232 is product-driven, the lever there is *engineering and material* — whether a redesign or a different input changes the classification enough to fall outside the covered derivative scope.

There is also money on the back end. If you have overpaid because of a misclassification, or if you re-export goods or use them to produce exported articles, you may be able to recover duties — including some of these trade-remedy layers — through duty drawback. Importers routinely leave that money on the table simply because they never modeled which programs they were paying in the first place.

How Tariffloop keeps the three straight

Tracking one product across three constantly-shifting programs is manageable by hand. Doing it across hundreds of SKUs — keeping every classification current, watching List changes, monitoring 232 derivative expansions, and reacting to IEEPA rate moves that can land overnight — is not. That is exactly where the work compounds and where mistakes scale.

Tariffloop automates the full stack: it classifies your HTS codes, applies the correct Section 301, Section 232, and IEEPA layers by origin and product, monitors rate and scope changes, and flags the duty drawback you may be owed. The free tariff calculator shows the math for one product; the platform runs that same analysis across everything you import.