Section 232 Tariffs Explained: The 2026 Complete Guide
Of the four legal authorities behind the 2026 US tariff stack, Section 232 is the most durable. While IEEPA tariffs face pending court challenges and reciprocal baselines depend on executive orders, Section 232 tariffs are grounded in a 1962 statute with broad judicial deference and a track record of surviving legal attacks. For importers, that means Section 232 actions are likely to outlast the others. This guide explains what Section 232 is, how it works, what it covers in 2026, and how to respond.
What Section 232 is
Section 232 of the Trade Expansion Act of 1962 authorizes the President to impose import restrictions — including tariffs, quotas, or outright bans — when the Commerce Department determines that imports of a particular product threaten US national security.
The statute was rarely used before 2018. The first Trump administration revived it for steel and aluminum tariffs. The second Trump administration has expanded it dramatically — autos, semiconductors, pharmaceuticals, copper, lumber, and more are now either under Section 232 tariffs or under investigation.
How a Section 232 action happens
- Initiation — Commerce Department's Bureau of Industry and Security (BIS) opens an investigation, either on the Department's own motion or by petition from industry.
- Investigation — BIS analyzes import volumes, domestic production capacity, national security implications. Maximum 270 days.
- Report to President — BIS recommends whether tariffs are warranted and at what level.
- Presidential decision — President has 90 days to decide. Options: do nothing, impose tariffs, impose quotas, negotiate deals with affected countries.
- Implementation — Treasury and CBP collect the duties at the border.
What's currently under Section 232 in 2026
| Product category | Rate | Status |
|---|---|---|
| Steel | 50% | Active since 2018, doubled June 2025 |
| Aluminum | 50% | Active since 2018, doubled June 2025 |
| Steel derivative products | 50% | Expanded 2025 |
| Aluminum derivative products | 50% | Expanded 2025 |
| Automobiles (passenger) | 25% | Active Q4 2025 |
| Auto parts | 25% | Active 2025 |
| Pharmaceuticals | 10% phasing up | Phasing in through 2026 |
| Semiconductors (packaged) | 25% | Phasing in Q2 2026 |
| Copper | Under investigation | Decision pending |
| Lumber/Softwood | Under investigation | Decision pending |
| Critical minerals | Under investigation | Multiple ongoing |
The national security rationale
The statute requires Commerce to find a "national security" threat. What counts:
- Risk to domestic capacity for defense-critical materials
- Dependence on foreign sources that could be cut off in conflict
- Concentration of supply in geopolitical rivals
- Erosion of industrial base critical to military readiness
Critics argue that the second Trump administration has stretched "national security" beyond its traditional meaning — including basic manufacturing like steel and basic consumer goods like autos. Courts have generally deferred to the executive on these determinations, however.
Section 232 vs Section 301 vs IEEPA
| Authority | Trigger | Duration | Court vulnerability |
|---|---|---|---|
| Section 232 | National security threat | Indefinite | Low — strong deference |
| Section 301 | Unfair foreign trade practice | Indefinite | Low — well-established |
| IEEPA | Declared national emergency | 1 year, renewable | Medium-high — pending challenge |
| Reciprocal (EO) | Trade imbalance | Uncertain | High — built on IEEPA |
For full legal context see our reciprocal tariffs guide.
Stacking with other layers
Section 232 stacks on top of base MFN duty but generally does NOT stack with the reciprocal baseline. So for a Chinese steel product:
- Base MFN (0%) + Section 232 (50%) + Section 301 (25%) = 75%
- Reciprocal 30% does NOT apply because Section 232 governs metals
For a Mexican non-USMCA auto:
- Base MFN (2.5%) + Section 232 (25%) + IEEPA (25%) = 52.5%
Use our duty calculator for your specific product and country.
Country deals and exclusions
Several countries have negotiated reductions or alternative arrangements:
- UK — aluminum exemption (negotiated 2025)
- South Korea — steel quota in lieu of tariff (carried from 2018)
- Brazil — steel quota (carried from 2018)
- Argentina — steel and aluminum quotas
- EU — TRQ negotiations ongoing 2026
- Japan — auto Section 232 reduced to 15% under mid-2025 framework
The product exclusion process
Even when Section 232 applies to a country, individual products can be excluded if:
- The product is not available from US producers in sufficient quantity, quality, or timeliness
- Granting the exclusion would not undermine the action's purpose
- No US producer objects, or the objection is addressed
How to request:
- File via the Commerce Department's exclusion portal
- Provide detailed product specifications and technical justification
- Wait for public comment period (US producers can object)
- Wait for Commerce decision (3-6 months typical)
- If granted: exclusion is product-specific, valid for 1 year, renewable
Approval rates run 20-40% on average, higher for specialty grades. A trade attorney typically handles preparation for $5,000-$15,000.
Strategic response for importers
- Verify your HTS classification. Sometimes a small specification difference moves a product out of the Section 232 list.
- Check country deals. UK aluminum is competitive again; Korean steel quota allocations are valuable.
- File exclusions for specialty products. Worth the legal cost for specialized grades.
- Plan for long-term tariff. Section 232 actions are durable; treat them as permanent cost structure, not temporary.
- Watch new investigations. Copper, lumber, and critical minerals decisions are pending in 2026.
Frequently asked questions
What is Section 232?
Section 232 of the Trade Expansion Act of 1962 authorizes the President to impose tariffs on imports that threaten US national security, after a Commerce Department investigation.
Can Section 232 tariffs be challenged in court?
Yes, but courts give wide deference to the President on national security determinations. Section 232 actions have generally survived legal challenges, unlike IEEPA-based tariffs.
Does Section 232 apply to USMCA goods?
It depends on the product. Section 232 on steel and aluminum applies regardless of USMCA. Section 232 on autos has a USMCA carve-out for qualifying vehicles.
How long do Section 232 tariffs last?
Indefinitely. There is no statutory expiration. Some have been in place since 2018 and counting.
Can I get a Section 232 exclusion?
You can file via the Commerce Department's portal. Approval requires showing domestic unavailability and no producer objection. Approval rates are 20-40%.
What's the maximum Section 232 rate?
The statute doesn't set a maximum. Tariffs are at the President's discretion based on the BIS report. Current high is 50% on steel and aluminum.