Section 301 Tariff Exposure Calculator — What Does Your Supply Chain Owe?

The 15 Countries Under Investigation

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.

Why These Countries?

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.

How Section 301 Stacks With Other Duties

Section 301 is cumulative — it adds on top of existing tariff layers. Understanding the stacking order is critical for accurate landed cost forecasting:

• Base MFN Tariff: The starting point (e.g., 5% for electronics)
• + Section 301 Duty: Adds on top (e.g., +15% for China electronics) = 20% total
• + Section 232 (steel/aluminum): Stacks if applicable (e.g., +25% for steel) = 45% total
• + Antidumping/Countervailing: Stacks on cumulative total
• EXCEPTION — USMCA: Does NOT stack with USMCA-compliant Canadian/Mexican goods; preferential USMCA rate applies instead

Real-World Example: Section 301 Impact on Landed Cost

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.

Strategies to Minimize Section 301 Exposure

• Diversify sourcing: Shift production to lower-rate countries (Brazil, Thailand) where feasible
• Optimize HTS classification: Reclassify products into lower-duty categories (requires advance ruling)
• Use USMCA: Shift to Mexican/Canadian suppliers if country-of-origin rules allow
• Apply for exclusions: Monitor the Federal Register for Section 301 exclusion procedures (expected April 2026)
• Plan inventory: Pre-position goods before tariff increases; negotiate extended payment terms with suppliers
• Reexport optimization: Explore re-processing in non-covered countries to change country of origin

Using the Calculator for Scenario Planning

The Section 301 Tariff Exposure Calculator is designed for quick supply chain modeling. Use it to:

1. Estimate current exposure: Plug in your top product categories and suppliers
2. Compare source countries: Run scenarios across Vietnam, Mexico, Thailand, etc. to identify the lowest-duty option
3. Model landed cost impact: Export results to share with procurement, finance, and pricing teams
4. Plan diversification: Identify supplier candidates in lower-rate countries
5. Track changes: Monitor for exclusion announcements and exclusion procedures

Additional Resources

• Section 301 Tariffs on China 2026 → Complete tariff rate reference by HTS code
• Full Landed Cost Calculator → Model total duty including Section 301, MPF, HMF, and Section 232
• HTS Classifier Tool → Accurately classify your products before calculating duty rates
• Compliance Dashboard → Track all regulatory triggers including Section 301, Section 232, and antidumping

Methodology & Disclaimer

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:

• Product-specific exclusions (when released)
• Goods already in-bond or in-transit under prior classification
• End-use provisions or trade agreement benefits
• Changes to tariff schedules after March 2026
• Company-specific tariff relief programs

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.

Country-by-Country Section 301 Rate Guide

Each of the 15 countries under Section 301 investigation carries a distinct tariff profile shaped by its trade relationship with the US, the product categories it exports, and existing bilateral agreements. Below is a breakdown of the three highest-impact origins.

China — The Anchor of Section 301

China faces the steepest Section 301 rates across all product categories — 20% to 25% on top of base MFN duties. The original Section 301 actions (Lists 1–4A, 2018–2019) covered $370 billion in Chinese goods. The March 2026 expansion effectively extends coverage to remaining categories that had previously escaped. For electronics importers, this means a total effective rate of 30%–32% when combining MFN base (5%–7%) with Section 301 (25%). Apparel from China faces MFN 17%–32% plus Section 301 20% — a combined effective rate that routinely exceeds 50% on finished garments. Importers who previously sourced from China have already diversified significantly to Vietnam, India, and Bangladesh, but the March 2026 investigations now impose rates on those alternative sources as well, creating a "no escape" scenario for certain product categories.

China-specific considerations include UFLPA forced labor compliance (which adds supply chain documentation burden), anti-dumping and countervailing duties on specific products (steel, aluminum, solar panels), and the reality that many "Vietnam-origin" goods contain Chinese components that may trigger anti-circumvention enforcement.

Vietnam — The Second-Highest Exposure

Vietnam has absorbed the largest share of China-to-alternative supply chain shifts since 2018. The March 2026 Section 301 rates — 10% to 15% depending on product category — represent a significant cost increase for importers who diversified to Vietnam specifically to avoid China tariffs. Vietnam's top US export categories (electronics, footwear, apparel, furniture) are all covered. Critically, Vietnam has no free trade agreement with the US, so there is no preferential rate to fall back on. The pending IEEPA executive order adds a further 10% baseline tariff on top of Section 301, creating potential total effective rates of 25%–40% on Vietnam-origin goods when all tariff layers are combined.

CBP anti-circumvention enforcement is particularly aggressive for Vietnam-origin goods. Products assembled in Vietnam from Chinese components must demonstrate "substantial transformation" — simple assembly, repackaging, or minor processing is insufficient to change country of origin. Importers should maintain detailed bills of materials, manufacturing affidavits, and supplier audit documentation to defend Vietnam origin claims.

India — GSP Suspension Compounds the Problem

India faces Section 301 rates of 8% to 15% across covered categories. Unlike Vietnam, India had historically benefited from the Generalized System of Preferences (GSP), which provided duty-free treatment for qualifying goods. GSP benefits were suspended for India in June 2019 and have not been restored. The combination of GSP suspension + Section 301 + IEEPA baseline means India-origin goods now face the highest effective tariff increase relative to their pre-2019 baseline of any major US import source. Pharmaceutical intermediates and generic drug imports from India (HTS chapters 29-30) face particular scrutiny given strategic supply chain concerns.

How to Prepare for Section 301 Exclusion Requests

When the USTR opens exclusion procedures for the March 2026 investigations, importers will need to demonstrate that their specific product meets exclusion criteria. Based on historical precedent from the 2018–2019 China Section 301 actions, successful exclusion requests typically require:

1. Product specificity: Identify your product by exact 10-digit HTS code, not broad category. Exclusions are granted at the HTS code level, not the product family level.
2. Domestic unavailability: Demonstrate that the product cannot be sourced from the United States or from countries not subject to Section 301. This requires documenting supplier outreach and market research.
3. Severe economic harm: Show that the tariff causes disproportionate harm to your business relative to the policy objective. Financial statements and margin impact analysis strengthen this argument.
4. National interest: Products essential to US national security, public health, or critical infrastructure have historically received priority consideration.

Begin assembling your exclusion documentation now, even before procedures are announced. The exclusion window is typically 30–60 days and the application process is competitive. Importers who have their data ready on day one have a significant advantage.