Solar Tariffs & Trade Policy in 2026: How 4 Overlapping Programs Stack

The 30-Second Version

Section 201 is gone — but it was never the only tariff on imported solar panels. Three other programs remain in effect through 2026:antidumping and countervailing duties (AD/CVD) on Southeast Asian manufacturing, Section 301 tariffs on Chinese-origin goods, and theForeign Entity of Concern (FEOC) restrictions that gate clean-energy tax-credit eligibility. These programs are not mutually exclusive: a single import can trigger several at once, and in the worst case the combined exposureexceeds 300%. The cheap path — a compliant, non-Chinese, non-circumvention-flagged module — is genuinely cheap now. The expensive path is more expensive than most homeowners realize. Rates below are approximate and illustrative; they change frequently with administrative reviews and scope rulings. On August 6, 2026, a Section 232 proclamation on polysilicon derivatives was signed into law, adding a new layer: a15% ad valorem tariff on imported wafers, cells, and finished modules plus minimum import price (MIP) floors across the upstream stack (raw polysilicon-only imports are subject only to the $21/kg floor), effectiveDecember 4, 2026. Details are in the callout below.

1. Section 201 Expiry — the Floor, Not the Ceiling

On February 6, 2026, the Section 201 global safeguard tariff on imported crystalline silicon solar cells and modules expired after an eight-year run that began at 30% in 2018 and stepped down to roughly 14% in its final year. For the first time since 2018, imported panels can clear U.S. customs without this surcharge.

That is a real cost reduction, but it removed onlyone layer. Three other programs remain on top, and they — not the now-expired safeguard — are what determine landed cost in 2026. For the full Section 201 schedule (the 2018→2026 step-down) and the original two-forces framing, see ourSection 201 expiry deep-dive. This guide is the companion piece: it covers what that article only touches — AD/CVD, Section 301, FEOC, and how they stack.

2. AD/CVD on Southeast Asian Manufacturing — the Biggest Swing

AD/CVD (antidumping and countervailing duty) law lets the U.S. impose punitive duties on goods sold below fair value or subsidized by a foreign government. In solar, the dominant current application is thecircumvention inquiries against cells and modules from Cambodia, Malaysia, Thailand, and Vietnam. The core allegation: panels assembled in Southeast Asia were routing Chinese-origin cells through those countries to dodge the long-standing China AD/CVD orders.

What makes AD/CVD the single biggest swing factor is thewide, company-specific rate spread. Duties are set per company based on each firm's administrative-review record, so two factories in the same country can face wildly different rates. Across the four flagged countries, exposure runs roughly from~50% up to 250% or more for the most exposed entries, with Cambodia historically landing at the high end. These numbers move every review cycle, which is why no single rate is ever "the" AD/CVD number — there is a range, and it is administrative, not fixed.

AD/CVD alone can make a panel uneconomic to import. When it stacks on top of other programs, the combined rate climbs fast — which is the whole point of the table further down.

3. Section 301 China Tariffs — and How They Stack

Section 301 is the separate tariff authority the USTR uses against goods of Chinese origin. In its 2024 update, USTR raised the Section 301 rate on solar cells to roughly~50% (up from 25%); modules are also affected. This is a direct duty on Chinese-origin product — independent of AD/CVD, and independent of the now-expired Section 201.

The critical interaction: Section 301 and AD/CVD both apply to Chinese-origin goods, and they stack. A module that is Chinese-origin and also caught by a China AD/CVD order can carry both duties at once, with no offset. That is how a single import can accumulate a very high combined rate even before FEOC enters the picture. For non-Chinese-origin goods, Section 301 does not apply — which is part of why origin is the most important variable in 2026 landed cost.

3a. The July 2026 Forced-Labor Section 301 Actions

On July 23, 2026, USTR issued final Section 301 actions imposing additional duties on products of60 economies in connection with forced-labor import prohibitions — a broad, global action distinct from the China-specific 301 tariffs above. The rule was published in the Federal Register on July 28, 2026 (document 2026-15181). Unlike the China-origin Section 301 duties, these forced-labor duties are not limited to one country; they apply across a wide range of trading partners, which significantly expands the footprint of Section 301 exposure for solar importers sourcing from third countries.

Stacking interaction with Section 232. An important carve-out limits how the new forced-labor duties layer: products covered by the August 6, 2026 Section 232 polysilicon proclamation (wafers, cells, and finished modules) areexcluded from these Section 301 forced-labor duties. Instead, such goods fall under the Section 232 tariff plus the MIP framework described in the callout above. In other words, for polysilicon-derivative imports, Section 232 and the MIP floors — not the new forced-labor 301 duties — are the governing regime. Importers should confirm which regime applies to a given HTS classification before relying on either exclusion.

4. FEOC Restrictions — Not a Tariff, but a Supply Gate

The Foreign Entity of Concern rules, tied to IRA Sections 40207 and 45, are not a tariff at all — they carry no percentage rate. Instead, they are an eligibility gate: panels and components tied to a FEOC-linked entity are excluded from the clean-energy tax credit supply chain. The penalty is not a customs surcharge; it is losing access to the credit pathway that makes compliant panels more valuable downstream.

The market effect is indirect but real. When FEOC rules disqualify a slice of global supply from the credit system, eligible (compliant) panels face more demand chasing less flexible supply. That supports pricing for compliant modules — which is why the Section 201 duty removal does not translate into a clean, across-the-board consumer price cut. FEOC is also what pushes the worst-case circumvention scenario past 300% in practice: the panel is both heavily dutied and credit-ineligible, so its effective cost disadvantage is larger than the headline rate alone suggests.

5. The Commerce Onshoring Incentive Program

Alongside the Section 232 tariff and MIP floors, the Department of Commerce announced an onshoring incentive programdesigned to reward companies building domestic solar manufacturing capacity. The structure ties duty relief to tangible construction progress, not to pledges or announcements. Approved onshoring plans must begin construction by January 20, 2029; plans that miss that deadline forfeit eligibility. Once a plan is approved, the importer's access to duty relief scales with demonstrated construction milestones — the further along the facility, the greater the relief available against the Section 232 tariff and MIP obligations.

For solar importers evaluating landed-cost strategy in 2026, this program matters because it creates a second route to cost reduction alongside the low-duty compliant-module path: a company with an approved onshoring plan and active construction can partially offset the new Section 232 burden on its remaining imports. The interaction with the MIP floors and the country-adjusted 15% rate is still being operationalized by CBP and Commerce, so the exact relief formula should be confirmed with the agencies for any specific project.

How the Programs Stack — the Centerpiece

The whole reason these four programs matter together is that they overlap. The table below shows four illustrative import scenarios with each program's approximate contribution and a combined total. Read it as a directional map of where landed cost lands, not a quote — and remember that AD/CVD rates are company-specific, so two panels in the same row can differ a lot.

The takeaway lives in the spread between the top and bottom rows. A compliant, non-Chinese, non-circumvention-flagged module now lands at roughly 0% duty — that is where the genuine cost relief from Section 201's expiry shows up. Everything else is a surcharge, and at the bottom of the table the surcharges compound.

What This Means for Homeowners in 2026

1. Compliant-panel pricing trends down — slowly.Inventory lag and FEOC-constrained eligible supply mean the Section 201 removal reaches quotes gradually, not overnight. Panels already in U.S. warehouses were imported under the old duty and are priced accordingly.
2. Ask your installer the panel's country of origin and FEOC compliance. Origin is the single biggest variable in 2026 landed cost. A quote that does not tell you what you are buying is a quote you cannot stress-test. OurPanel Comparison Tool lists tier, efficiency, and origin for common residential modules.
3. Compare quotes on cost-per-watt. Installer margin behavior varies — some pass hardware savings through, others hold price. Dollars-per-watt is the cleanest way to see who is discounting; compare at a state level on oursolar cost-per-watt pages (e.g.,California orTexas).
4. The expired 25D residential credit is the bigger cost driver. The Section 25D residential credit endedDecember 31, 2025, and that change moved homeowner economics far more than any layer of this tariff stacking lowers them. Section 48E still flows to lease/PPA providers through 2027, which is why financing structure now matters more than hardware origin for most buyers — see ourFinancing Comparison and thepost-25D financing inversion analysis.

Sources & Disclaimer

Sources: U.S. International Trade Commission (USITC); U.S. Department of Commerce, Enforcement & Compliance (AD/CVD proceedings and circumvention inquiries on Cambodia, Malaysia, Thailand, Vietnam); Office of the U.S. Trade Representative (USTR) Section 301 docket (2024 solar cell rate increase; July 23, 2026 forced-labor Section 301 actions on 60 economies, Federal Register document 2026-15181, July 28, 2026); SEIA solar tariff tracker; IRA Sections 40207 and 45 (FEOC restrictions); White House fact sheet (August 6, 2026, Section 232 polysilicon proclamation and onshoring incentive program); KPMG Tax Newsflash (August 7, 2026); Hunton Andrews Kurth legal update (August 11, 2026, Section 232/301 stacking exclusion and MIP compliance mechanics). This article provides general information, not legal, tax, or trade advice. All tariff rates are approximate, illustrative, and subject to change via administrative review, scope rulings, or new agency action; the >300% figure is a worst-case combined exposure, not a typical rate. Verify current duties with U.S. Customs and Border Protection or a qualified trade professional for your specific situation. For the Section 201 schedule and the original two-forces framing, see ourSection 201 expiry deep-dive. This guide was last reviewed on August 13, 2026. The Section 232 polysilicon proclamation (signed August 6, 2026) imposes a 15% ad valorem tariff on imported polysilicon derivatives (wafers, cells, modules) and minimum import price floors effective December 4, 2026. The July 23, 2026 Section 301 forced-labor actions (Federal Register 2026-15181) are documented above but are NOT yet reflected in the installed cost-per-watt rates on this page, which lag module spot prices.