Tariff Stacking in 2026: Section 301, 232, and the New Section 122

# Tariff Stacking in 2026: How to Calculate Your Real Duty Exposure

If you thought a 15% tariff was straightforward, you haven't looked at the tariff code in detail. In 2026, importers face not one, not two, but often three or more tariffs layered on top of each other—what logistics pros call "tariff stacking."

A single shipment can now be subject to: - Base MFN (Most Favored Nation) duties - Section 301 retaliation tariffs (China only) - Section 232 national security tariffs (steel, aluminum, and copper as of April 6, 2026) - Section 122 universal tariff (effective February 24, 2026) - Possible countervailing duties (CVDs) and anti-dumping duties (ADDs)

Critically, not all layers stack on every product. Products already subject to Section 232 are exempt from Section 122 under the February 24 proclamation. Understanding which layers apply—and which don't—is the difference between an accurate landed cost and a costly surprise.

The result? A product that looked profitable at a 15% duty rate can easily face 50–80%+ in total duty exposure once every applicable layer is calculated. If you're not modeling all of them, you're under-pricing your inventory and destroying margins.

What Changed in Early 2026

On February 24, 2026, a new Section 122 universal tariff of 10% took effect on imports from most countries. This followed the Supreme Court's ruling on the IEEPA emergency tariff orders, which invalidated the prior reciprocal tariff structure but left Section 122 authority intact.

The practical impact: importers who were already dealing with Section 301 and Section 232 exposure now have an additional flat 10% stacked on top. Canada and Mexico are exempt under USMCA, but nearly every other trading partner is subject.

This is the most significant tariff development for non-China importers in recent memory.

Then on April 2, 2026, the President signed a proclamation restructuring Section 232 tariffs into a tiered system and adding copper to Section 232 scope for the first time. For full details on the tiered rate structure, see our articles on the Section 232 Steel, Aluminum & Copper Restructure and the Section 232 Copper Tariff. The UK also negotiated reduced Section 232 rates under its Economic Prosperity Deal—see UK Steel & Aluminum Deal.

Understanding the Tariff Layers

### Layer 1: MFN Base Duty (Harmonized Tariff Schedule)

This is the "normal" tariff rate published in the U.S. Harmonized Tariff Schedule (HTS). It applies to goods from most countries not covered by a free trade agreement.

Example: Steel wire rod (HTS 7213.10) carries an MFN rate of 5.5%.

MFN rates are generally low (0–15% for most goods) and stable unless Congress changes them.

### Layer 2: Section 301 Tariffs (China Only)

Section 301 of the Trade Act of 1974 allows retaliatory tariffs when another country is found to violate trade agreements or steal intellectual property. These apply exclusively to goods from China.

As of 2026, Section 301 rates include: - 25% on most goods from China (Lists 1–3) - 7.5% on certain goods from China (List 4A)

These stack on top of the MFN rate—they do not replace it.

Example for apparel from China: - MFN rate: 16.5% - Section 301 surcharge: 25% - Combined: 41.5% (before Section 122)

Section 301 does not apply to imports from Vietnam, India, Mexico, or other non-China origins.

### Layer 3: Section 232 Tariffs (Steel, Aluminum, and Copper)

Section 232 allows tariffs on products deemed critical to national security. On April 2, 2026, the President signed a proclamation restructuring Section 232 tariffs into a tiered system effective April 6, 2026:

- Annex I-A (base metal articles): 50% on steel, aluminum, and copper articles (25% for UK under the Economic Prosperity Deal) - Annex I-B (metal-heavy derivatives): 25% on products with significant metal content - Annex III (industrial/electrical grid equipment): 15% transitional rate through December 31, 2027 - Copper was added to Section 232 scope for the first time as of April 6, 2026

Products containing 15% or less metal content by weight are exempt. Tariffs now apply on the full customs value, not just the metal content portion.

These stack on top of MFN and, for Chinese products, on top of Section 301 as well. USMCA does not exempt Section 232—Canada and Mexico pay the same rates.

Important: Products subject to Section 232 are exempt from Section 122. These two layers do not stack.

### Layer 4: Section 122 Universal Tariff (New — February 2026)

This is the layer most importers missed when it took effect. Section 122 imposes a flat 10% tariff on imports from nearly all countries, effective February 24, 2026.

Key exemptions: - Canada and Mexico are exempt under USMCA - Products subject to Section 232 tariffs are exempt from Section 122 (per the February 24, 2026 proclamation) - Most other trading partners and non-232 products are subject

This 10% is additive to other duties—but only on non-232 goods. A product from Vietnam that previously faced only its MFN rate now faces MFN + 10%. A product from China faces MFN + Section 301 + Section 122. However, if the product is steel, aluminum, or copper (subject to Section 232), Section 122 does not apply—you pay Section 232 instead, not both.

### Layer 5: Countervailing Duties and Anti-Dumping Duties

If the U.S. Department of Commerce finds that a country is subsidizing exports or selling below fair market value, it can impose CVDs and ADDs. These are common on steel, solar panels, and certain electronics.

Unlike the layers above, CVDs and ADDs are product- and country-specific. Check USITC.gov for current orders.

Real-World Tariff Stacking Example

Let's calculate the true landed cost of a common import: 200 units of Chinese stainless steel fasteners.

Base scenario: - Cost per unit: $10 (FOB Shanghai) - Container value: $2,000

Tariff calculation (2026 rates):

1. MFN duty (HTS 7318 – fasteners): 6.5% × $2,000 = $130 2. Section 301 (China, List 1–3): 25% × $2,000 = $500 3. Section 232 (Steel): 50% × $2,000 = $1,000 4. Section 122: $0 — Section 232 products are exempt from Section 122 5. Freight & insurance: $600

Total landed cost: $2,000 + $130 + $500 + $1,000 + $0 + $600 = $4,230

Per-unit cost: $4,230 ÷ 200 = $21.15

You started at $10 per unit. By the time it lands, you're at $21.15—a 111% cost increase. Note that Section 122 does not apply here because the product is already subject to Section 232 steel tariffs. A common mistake is adding Section 122 on top of Section 232—that overstates your exposure and leads to bad sourcing decisions.

A Second Example: Vietnamese LED Fixtures

Not all tariff stacking is China-specific. Section 122 means every non-USMCA supplier is now affected.

LED light fixtures from Vietnam (HTS 9405.40), cost $8 per unit:

Your assumption: - Cost: $8 - MFN duty (3.9%): $0.31 - Freight & handling: $0.56 - Landed cost: $8.87

2026 reality:** - Cost: $8.00 - MFN duty (3.9% × $8): $0.31 - Section 122 (10% × $8): **$0.80** ← new in 2026 - Freight & insurance (7% × $8): $0.56 - Brokerage & fees: $0.30 - **Real landed cost: $9.97

That extra $0.80 per unit from Section 122 doesn't sound like much—until you're running a 10,000-unit order and realize $8,000 in margin you didn't budget for has evaporated.

The "Tariff Stacking Blind Spot"

Most importers miss one or more layers for predictable reasons:

Customs entry forms only show one rate. CBP Form 7501 consolidates duties into a single line, which can obscure how many layers contributed to it.

Brokers don't always flag all sections. Your broker may specialize in Section 301 work and overlook Section 232, or miss the new Section 122 because it's only been in effect since February 2026.

You're using last year's numbers. Section 232 rates doubled in mid-2025. Section 122 didn't exist before 2026. Any landed cost model built before Q1 2026 is potentially materially wrong.

Wrong HTS code. A single digit difference can shift your product between duty categories. Always verify your 10-digit HTS classification before running calculations.

Step-by-Step: How to Calculate Your Real Tariff Rate

### Step 1: Confirm HTS Classification Use the USITC database (usitc.gov) or USA Trade Online to verify the exact 10-digit HTS code. This is non-negotiable—wrong code, wrong rate.

### Step 2: Look Up MFN Rate In the USITC HTS database, find the "General" column. Note this percentage.

### Step 3: Apply Section 301 (China only) Visit USTR.gov and check whether your product appears on Lists 1, 2, 3, or 4A. Add the applicable percentage if importing from China.

### Step 4: Apply Section 232 (Steel, Aluminum, and Copper) If your product is a steel, aluminum, or copper article (or a metal-heavy derivative), apply the tiered Section 232 rate: 50% for base metal articles (Annex I-A), 25% for metal-heavy derivatives (Annex I-B), or 15% for industrial/electrical grid equipment (Annex III, through Dec 2027). UK-origin articles qualify for reduced rates (25%/15%). This applies to imports from all countries, including Canada and Mexico.

### Step 5: Apply Section 122 (Non-USMCA, Non-Section 232 only) Add 10% for all countries except Canada and Mexico—but only if the product is NOT already subject to Section 232. If you applied a Section 232 rate in Step 4, skip this step. Section 122 is currently in effect through July 24, 2026, pending Congressional review.

### Step 6: Check CVD/ADD Orders Search USITC.gov for your HTS code and country of origin. If a CVD or ADD order exists, add that rate.

### Step 7: Add Logistics Costs - Ocean freight: typically 5–8% of CIF value - Customs brokerage: $150–$350 per entry - Harbor maintenance fee: 0.125% of CIF value - Bonding, ISF filing, and port fees: $100–$500

Strategies to Reduce Tariff Exposure

Source from USMCA countries. Canada and Mexico are exempt from Section 122 and have zero MFN rates under USMCA. Section 232 still applies for steel and aluminum, but overall exposure is significantly lower.

Use Foreign Trade Zones (FTZs). Goods processed or assembled in an FTZ can defer or reduce duties on imported components. This is particularly useful for manufacturers.

Apply for Section 301 exclusions. USTR periodically grants exclusions for specific Section 301 products. If you import a specialty item from China, it's worth checking whether an exclusion exists or applying for one.

Consider duty drawback. If you export finished goods manufactured with imported components, you may be able to recover up to 99% of duties paid on those components.

Claim IEEPA refunds. If you paid IEEPA-based tariffs before the Supreme Court ruling, you may be entitled to refunds. CBP's CAPE tool launches April 20, 2026—see our IEEPA Refund Guide and CAPE Tool walkthrough for step-by-step instructions.

Plan for Section 122 expiration. The 10% universal tariff expires July 24, 2026, unless Congress extends it. If your margins depend on the current rate environment, model what happens if it lapses—or if it's replaced with something higher. See Section 122 Expiration Countdown.

Negotiate with your supplier. With tariff exposure now clearly quantifiable, you have a data-backed argument for renegotiating CIF pricing. Suppliers who want to retain U.S. business have reason to share some of the burden.

Use the Calculator

Rather than running these calculations manually, our Duty & Tariff Calculator applies all current tariff layers automatically—MFN, Section 301, Section 232, and Section 122—and shows you a complete breakdown by country of origin. You can compare what the same product costs to import from China versus Vietnam versus Mexico side by side.

The Bottom Line

In 2026, tariff stacking is the hidden margin killer. The Section 122 addition means even importers who successfully diversified away from China are now facing a new layer they hadn't modeled. Section 232 rates doubling in 2025 hit steel and aluminum buyers hard, and the new Section 232 semiconductor tariff effective January 2026 adds another 25% layer for electronics importers.

Before committing to any import contract, calculate every layer. Revisit your landed cost models quarterly—tariff policy is moving faster now than at any point in the last 30 years, and a model that was accurate in December 2025 may be significantly wrong today. For a complete walkthrough of every cost component beyond duties, see our guide on how to calculate landed cost.

Remember that tariff exposure is only one piece of total import cost. Use our CBM Calculator to estimate ocean freight volume, our Freight Class Calculator to determine domestic LTL shipping costs, and our Dimensional Weight Calculator if you are shipping parcels rather than pallets. And for the vessel-level Section 301 charge that lands on ocean freight invoices separately from duties, see our breakdown of the Section 301 Maritime Port Fee Increase — the pass-through jumps from $50 to $80 per net ton on April 17, 2026.

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