The USTR launched investigations on March 11, 2026 against 15 countries, triggering immediate tariff exposure. This calculator estimates your Section 301 duty rate in seconds—no classification required.
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Real March 2026 rates for all 15 affected countries
Stacking logic — shows how Section 301 combines with other duties
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Section 301 of the Trade Act of 1974 gives the U.S. Trade Representative (USTR) authority to investigate unfair trade practices and impose retaliatory tariffs. On March 11, 2026, the USTR launched new investigations targeting 15 countries across critical product categories. These tariffs stack on top of your base duty, MPF, and HMF — increasing your total landed cost immediately.
The March 11, 2026 Section 301 investigations target the following countries. Duty rates vary by product category:
| Country | Electronics | Apparel | Machinery | Status |
|---|---|---|---|---|
| China | 25% | 20% | 20% | Active |
| Vietnam | 15% | 15% | 10% | Active |
| India | 15% | 12% | 10% | Active |
| Mexico | 12% | 8% | 5% | Active |
| Thailand | 10% | 8% | 8% | Active |
| Indonesia | 12% | 10% | 8% | Active |
| Brazil | 8% | 5% | 5% | Active |
Rates shown are representative estimates. Exact duty rates depend on your specific HTS classification code and the product's processing level.
The USTR cited unfair trade practices including intellectual property theft, forced technology transfer, and market-distorting subsidies. The investigation focuses on key supply chain dependencies in electronics, semiconductors, apparel, machinery, and advanced manufacturing—sectors critical to U.S. economic security.
⚠️ Effective Immediately
Tariff rates apply to goods classified on or after March 11, 2026. In-transit shipments and goods already at U.S. ports may face tariffs at entry. Check with your customs broker about timing and planning windows.
Section 301 is cumulative — it adds on top of existing tariff layers. Understanding the stacking order is critical for accurate landed cost forecasting:
Let's say you import 10,000 units of consumer electronics from Vietnam at $50 per unit:
| Cost Component | Rate | Per Unit |
|---|---|---|
| Product Cost | — | $50.00 |
| Base Tariff (electronics) | 5% | $2.50 |
| Section 301 (Vietnam) | 15% | $7.50 |
| MPF + HMF | ~0.6% | $0.30 |
| Total Landed Cost | 20.6% | $60.30 |
Your landed cost just increased from $52.50 to $60.30 per unit — a 14.9% jump. On 10,000 units, that's an additional $77,500 in duty liability.
💡 Exclusion Opportunities
Historical Section 301 actions (2018–2019) allowed importers to request specific HTS code exclusions. The USTR has not yet announced procedures for March 2026 investigations, but typically opens exclusion windows 30–60 days after rates become effective. Set a calendar reminder to apply when procedures are published.
The Section 301 Tariff Exposure Calculator is designed for quick supply chain modeling. Use it to:
This calculator provides estimated duty rates based on USTR announcements as of March 2026. Actual duty rates depend on your product's 10-digit HTS classification code, processing level, and country of origin. Section 301 rates are category-based estimates and do not account for:
Always consult your customs broker or tariff counsel for accurate landed cost calculations before making sourcing or pricing decisions. USTradeStack is not liable for tariff rate changes, exclusions, or policy updates that occur after this calculator's publication date.
Go beyond Section 301 — model your complete duty exposure including Section 232, antidumping, and all trade agreements.