What Section 232 tariffs are — how a president taxes imports without Congress

The three lines

• Definition — Lets the president restrict imports once Commerce finds a national security threat
• Process — Investigation requested, Commerce reports within 270 days, president decides within 90
• Feature — No injury test, no new legislation. That is why it has become the default US tariff tool

Key questions

What exactly is a Section 232 tariff?

**A duty imposed under Section 232 of the US Trade Expansion Act of 1962.** The provision says that if the **Commerce Secretary determines that the quantity or circumstances in which a product is being imported threaten to impair US national security**, the president may restrict those imports. 'Restrict' covers not only tariffs but **quantitative limits (quotas)** or a combination of both. The process starts with an investigation. **The head of any executive branch department or agency** may ask Commerce to investigate the national security effects of a given import, and the department's **Bureau of Industry and Security (BIS)** conducts it. Once opened, Commerce has **270 days** to produce a report and recommendations, and the president then has **90 days** to accept the findings and decide what, if anything, to do.

How is it different from other tariffs?

**The basis is security rather than misconduct, which makes the evidentiary burden much lighter.** Conventional trade remedies require proving the other side did something wrong. An **antidumping duty** requires showing goods were sold below cost; a **countervailing duty** requires showing a foreign government subsidized them. Both additionally require a separate finding that **the domestic industry was actually injured**. Section 232 skips all of that. **What it needs is not the other side's fault but a single determination of a national security threat.** On top of that, **no new act of Congress is required** — the authority was delegated in 1962, so the president acts by executive action. Those two features are why Section 232 has become the main channel of recent US tariff policy.

Where has it actually been used?

**Steel and aluminum is the reference case; semiconductors occupy that place now.** On March 8, 2018 President Trump used Section 232 to impose tariffs on steel and aluminum imports, following Commerce Department investigations run by BIS. The authority was later extended to other products. It reached semiconductors on **January 14, 2026**, with a **25 percent** duty on advanced computing chips, covering semiconductor manufacturing equipment and derivative products — but **exempting data center, R&D, repair-and-replacement and startup uses**, among others. The **second round** reported by Politico on August 27, 2026 would remove those exemptions and extend the duty to finished goods such as **servers, laptops and game consoles**. That is covered in "US weighs second round of chip tariffs."

How does this reach companies outside the United States?

**Through two channels — the duty on exports, and pressure to invest in order to win exemptions.** The first is straightforward: export a covered product to the US and it is taxed. The second has become the more consequential one. Section 232 also gives the president **discretion over exemptions**, and discretion over who is in and who is out is itself a bargaining instrument. The approach reported to be favored by US Commerce Secretary Howard Lutnick would **tie each company's duty-free import volume to the size of its US manufacturing investment** — not "pay this" but **"build here if you want to avoid it."** SK Hynix's commitment of more than 4 billion dollars in Indiana, with HBM mass production in the United States from the second half of 2029, sits on that current.