Tariff Stacking in 2026: How the Post-Section-122 Duty Stack Actually Works (August Update)

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

Updated August 2, 2026. If you built a landed cost model before late July, it is wrong. The Section 122 universal tariff - the layer that dominated importer math from February through July - expired by operation of law at 12:01 a.m. EDT on July 24, 2026. It did not lapse into a tariff-free gap: new Section 301 forced-labor duties took effect the same minute across roughly 60 economies. The stack did not get smaller. It changed shape.

A single shipment entering the United States today can be subject to:

- Base MFN (Most Favored Nation) duty from the Harmonized Tariff Schedule - Section 301 forced-labor duties - 10% or 12.5%, roughly 60 economies, live since July 24, 2026 - Country-specific Section 301 actions - the legacy China lists, plus the 25% Brazil action effective July 22, 2026 - Section 232 national security tariffs on steel, aluminum, and copper articles and derivatives - Section 338 - an additional 50% on covered Canadian goods beginning August 19, 2026 - Countervailing duties (CVDs) and anti-dumping duties (ADDs)

Critically, not every layer applies to every product, and the exemption logic changed completely on July 24. The Section 232 / Section 122 mutual exclusivity that governed the spring is obsolete - Section 122 no longer exists. The new carve-outs run on different rules. Getting this wrong in either direction is expensive: overstate your stack and you kill sourcing decisions that were actually fine, understate it and you eat the difference at liquidation.

What Changed Between February and August 2026

Five things, in order:

1. February 24 - Section 122 imposed a flat 10% on most origins after the Supreme Court limited IEEPA tariff authority. Section 232 goods were exempt; USMCA-qualifying Canadian and Mexican goods were exempt. 2. April 2 / April 6 - Section 232 was restructured into tiers and copper was pulled into scope for the first time. 3. June 1 / June 8 - A further proclamation, *Further Adjusting the Tariff Regimes for Imports of Aluminum, Steel, and Copper*, applied duty to the full customs value of covered derivatives, lowered the US-origin metal content threshold for "melted and poured" / "smelted and cast" relief from 95% to 85%, and pulled additional derivatives (including aluminum lithographic plates and steel racks) into coverage. The changes run through December 31, 2027. 4. July 22 and July 24 - A 25% Section 301 action on Brazil took effect under HTS 9903.05.01 on July 22. Two days later, Section 122 expired on its 150-day statutory clock and the Section 301 forced-labor duties went live in the same minute. 5. July 20, effective August 19 - Three proclamations invoked Section 338 of the Tariff Act of 1930 against Canada, imposing an additional 50% on covered motor vehicles, alcoholic beverages, and dairy lines.

The net effect for a typical non-China importer: the flat 10% they had budgeted since February is gone, replaced by a 10% or 12.5% layer whose rate depends on their supplier country's forced-labor enforcement posture rather than on anything about their product. For Canadian importers, the USMCA shield that worked against Section 122 and works against Section 301 forced labor does not work against Section 338.

Understanding the Tariff Layers

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

The "normal" rate published in the US Harmonized Tariff Schedule, applying to goods from countries with normal trade relations and no preferential agreement.

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

MFN rates are generally low - 0% to 15% for most goods - and stable unless Congress changes them. Everything else stacks on top of this.

### Layer 2: Section 301 Forced-Labor Duties (60 Economies - New July 24, 2026)

This is the layer that replaced Section 122, and it is the one most landed cost models are still missing.

Following USTR investigations into 60 trading partners - together roughly 99.4% of US imports - USTR found that each economy failed either to impose or to effectively enforce a prohibition on importing goods produced with forced labor. The resulting action imposes an additional duty of 10% or 12.5% ad valorem, effective for goods entered for consumption, or withdrawn from warehouse for consumption, on or after 12:01 a.m. EDT July 24, 2026.

- The 10% tier applies to economies that maintain, or have committed to enact, a qualifying forced-labor import prohibition. - The 12.5% tier applies to the rest. - Tier assignment is mobile. India was proposed at 12.5% and landed at 10% in the final action after enacting an import ban. Verify each country's final tier against the Federal Register annex rather than a news summary - including this one.

Key exclusions: certain products including oil and gas and fertilizer are exempt, and goods that qualify for duty-free treatment under USMCA are spared. That last point is worth real money - USMCA rules-of-origin qualification is now worth 10 to 12.5 points of entered value on Canadian and Mexican cargo, which changes the arithmetic on whether chasing a certificate of origin is worth the compliance effort. See our USMCA certificate of origin guide.

Unlike Section 122, Section 301 has no statutory sunset. Section 122 lapsed because the Trade Act of 1974 caps it at 150 days without an Act of Congress. Section 301 actions remain in force until modified or terminated, and the authority has survived years of litigation over the China tariffs. Plan for this layer to persist. Full detail: Section 301 forced-labor tariffs live July 24 and the rate-by-country breakdown.

### Layer 3: Country-Specific Section 301 Actions

Separate from the forced-labor action, the legacy country-specific Section 301 program continues:

- China - Lists 1 through 3 at 25%, List 4A at 7.5%. - Brazil - an additional 25% under HTS 9903.05.01, effective July 22, 2026. The in-transit exemption for that action required entry by July 29 and is now closed. See in-transit windows closed.

These are additive to MFN and additive to the forced-labor layer. A Chinese good can carry MFN + 25% legacy 301 + the forced-labor 301 rate simultaneously - they are separate actions under separate investigations, not alternatives.

### Layer 4: Section 232 Tariffs (Steel, Aluminum, Copper)

Section 232 permits tariffs on imports deemed critical to national security. The current structure, as restructured in April and further adjusted effective June 8, 2026:

- Annex I-A (base metal articles) - 50% on steel, aluminum, and copper articles such as coil and sheet. Reduced rates apply for the UK under the Economic Prosperity Deal. - Annex I-B (metal-heavy derivatives) - covered derivatives, with duty now assessed on the full customs value, not only the metal content portion. - Annex III (industrial and electrical grid equipment) - a 15% transitional rate through December 31, 2027. - US-content relief - derivatives qualify as made "entirely" of US metal at 85% or more US-smelted-and-cast or melted-and-poured content, down from the prior 95% threshold as of June 8, 2026. - Reduced rates now reach certain agricultural and industrial equipment from countries that reached trade agreements, and certain USMCA-qualifying goods.

Section 232 stacks on MFN and on country-specific Section 301. See the April restructure, the copper tiers, and the 15% de minimis metal content test.

Obsolete rule warning: through July 23, Section 232 goods were exempt from Section 122. That exclusion died with Section 122. Do not carry it forward into your current model - it does not describe how the forced-labor layer interacts with Section 232, and any spreadsheet still zeroing out a layer on that basis is producing the wrong number.

### Layer 5: Section 338 - Canada, Beginning August 19, 2026

On July 20, 2026, three proclamations invoked Section 338 of the Tariff Act of 1930 - a Depression-era authority permitting duties of up to 50% against countries found to discriminate against US commerce - to impose an additional 50% ad valorem duty on covered Canadian motor vehicles, alcoholic beverages, and dairy products, effective 12:01 a.m. ET August 19, 2026.

Two things importers keep getting wrong:

- USMCA qualification does not exempt covered goods. The shield that works against the forced-labor layer does not carry over. - The duty applies to goods entered for consumption, or withdrawn from warehouse for consumption, on or after the effective date. Goods already sitting in a bonded warehouse are not grandfathered.

Coverage is defined by HTS line in the annexes, not by category description. Full analysis and the entry-timing playbook: Canada Section 338 tariffs August 19.

### Layer 6: Countervailing and Anti-Dumping Duties

If Commerce finds a country subsidizing exports or selling below fair value, CVDs and ADDs apply. These are product- and country-specific, frequently reach three digits, and are entirely independent of everything above - the forced-labor duty is explicitly additive to ADD/CVD already owed. Check current orders at usitc.gov, and see our ADD/CVD guide.

Worked Example 1: Chinese Stainless Steel Fasteners

200 units at $10 FOB Shanghai - $2,000 entered value.

| Layer | Rate | Duty | |---|---|---| | MFN (HTS 7318, fasteners) | 6.5% | $130 | | Section 301 legacy (China, List 1-3) | 25% | $500 | | Section 301 forced labor (China tier) | 12.5% | $250 | | Section 232 (steel article) | 50% | $1,000 | | Freight and insurance | - | $600 |

Total landed: $2,000 + $130 + $500 + $250 + $1,000 + $600 = $4,480. Per unit: $22.40.

Under the pre-July-24 stack this same entry came to $4,230 per the old Section 122 logic - the forced-labor layer added $250 that most models built in the spring still do not capture. Note that no layer here is zeroed out: the Section 232 exemption that used to knock out Section 122 has no equivalent against the forced-labor action.

Worked Example 2: Vietnamese LED Fixtures

LED light fixtures, HTS 9405.40, $8 per unit.

- Cost: $8.00 - MFN duty (3.9%): $0.31 - Section 301 forced labor (Vietnam tier - verify against the annex): $0.80 to $1.00 - Freight and insurance (7%): $0.56 - Brokerage and fees: $0.30 - Real landed cost: $9.97 to $10.17

The February-to-July version of this calculation used a flat 10% and produced $9.97. If Vietnam sits in the 12.5% tier, the same order costs 2 cents more per unit than your old model says - trivial on one carton, $2,000 on a 100,000-unit program, and entirely invisible until liquidation.

Worked Example 3: Canadian Wine, Before and After August 19

One pallet of Canadian wine, $30,000 entered value, USMCA-qualifying.

- Entered August 18: MFN $0 (USMCA), Section 301 forced labor $0 (USMCA-qualifying goods are spared), Section 338 $0. Total duty: $0. - Withdrawn from a bonded warehouse August 19: Section 338 at 50% = $15,000.

Same pallet. Same importer. One day. This is the single largest entry-date cliff on the 2026 calendar, and it lands on goods whose owners have spent the last month being told - correctly, until now - that USMCA protects them.

The Tariff Stacking Blind Spot

Importers miss layers for predictable reasons:

Your model still has Section 122 in it. This is the number one error in August 2026. Either the 10% is still there as a live layer, or the Section 232 exemption logic that referenced it is still zeroing out a layer that no longer exists.

CBP Form 7501 consolidates duties. The entry summary shows a total, which obscures how many independent programs contributed to it.

Brokers specialize. A broker deep in Section 301 China work may not be tracking the Section 338 Canada annexes, and the forced-labor action is only weeks old.

Chapter 99 reporting sequence. With four or more Chapter 99 provisions now potentially applying to one line, CBP has prescribed the order in which Chapter 98 and 99 provisions must be reported. Improper sequencing creates filing errors and delays entry processing - a compliance problem, not just a math problem.

Wrong HTS code. A single digit moves a product between duty universes. Verify the full 10-digit classification before running any of this. See how to read an HTS code.

Step-by-Step: Calculate Your Real Rate (August 2026)

1. Confirm the 10-digit HTS classification at usitc.gov. Non-negotiable. 2. Look up the MFN rate in the "General" column. 3. Apply country-specific Section 301 - China Lists 1-4A, Brazil 9903.05.01. 4. Apply the Section 301 forced-labor rate for the country of origin - 10% or 12.5% per the Federal Register annex. Skip only if the good is on the exclusion list (oil and gas, fertilizer, and others) or qualifies duty-free under USMCA. 5. Apply Section 232 if the article or derivative is in scope - and check the 85% US-content test before assuming full rate. 6. Apply Section 338 if the origin is Canada and the line is in an annex, for anything entered or withdrawn on or after August 19. 7. Check ADD/CVD orders at usitc.gov by HTS and origin. 8. Add logistics costs - ocean freight 5-8% of CIF, brokerage $150-$350 per entry, HMF 0.125% of CIF, plus bonding, ISF, and port fees.

There is no step in this list that zeroes out another step. That is the structural change from the spring: the current stack is close to fully additive, and the exemptions that exist are origin-based and product-based rather than program-versus-program.

Strategies to Reduce Exposure

Qualify for USMCA properly. With the forced-labor layer sparing USMCA-qualifying goods, origin certification is now worth 10 to 12.5 points on Canadian and Mexican cargo. It does nothing against Section 232 or Section 338.

Control the entry date. This is the highest-leverage lever left. Duty is assessed at the rate in effect on the date of entry for consumption - or, for warehoused goods, on the withdrawal date. Because tier assignments move (India shifted from 12.5% to 10% before the final action) and a second Section 301 investigation covering 16 additional countries is pending, entry timing is a live decision rather than an administrative afterthought.

Use a bonded warehouse deliberately, in both directions. Bonded storage defers duty and prices your cargo at the withdrawal-date rate. For most origins that is an option worth holding while tier assignments settle. For covered Canadian goods it is the opposite - withdraw before August 19 or pay 50 points. See our bonded warehouse guide, bonded warehouse cost per pallet, and the duty deferral calculator.

Compare FTZ treatment carefully. FTZs offer inverted-tariff relief for manufacturers, but the Section 338 proclamations require covered goods admitted on or after August 19 to enter in privileged foreign status, locking treatment at admission. See FTZ vs bonded warehouse.

Pursue duty drawback. If you export finished goods made with imported components, you may recover up to 99% of duties paid.

Renegotiate CIF pricing. Exposure is now precisely quantifiable, which is a data-backed argument for asking suppliers to share the burden. See negotiating freight rates.

Preserve Section 122 refund rights. The Court of International Trade ruled Section 122 unlawful in May 2026, the Federal Circuit stayed that ruling in June, and the appeal continues after expiration. Importers who paid the surcharge between February 24 and July 24 should file protests on liquidated entries within the 180-day deadline. See IEEPA and Section 122 refund guidance and the tariff refund calculator.

Use the Calculators

Rather than running this by hand, the Tariff Stacking Calculator applies the current layers and shows a full breakdown by origin, and the Duty & Tariff Calculator lets you compare the same product from China versus Vietnam versus Mexico side by side. For the deferral question specifically, the Duty Deferral Calculator prices the carrying cost of bonded storage against the duty at stake.

The Bottom Line

The single most dangerous landed cost model in August 2026 is one that is *almost* right - built in the spring, carefully accounting for Section 122 and its Section 232 carve-out, and now describing a tariff regime that stopped existing on July 24. The layers changed, the exemption logic changed, and the stack is now close to fully additive.

Rebuild the model. Then rebuild it again after August 19, and again when the second forced-labor investigation covering 16 more countries reports out. Tariff policy is moving faster than at any point in the last 30 years, and quarterly model reviews are no longer frequent enough.

For the full cost picture beyond duties, see how to calculate landed cost. For the vessel-level Section 301 charge that hits ocean freight invoices separately from duties, see the maritime port fee increase.

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