HS Code for Solar Panel Module: 8541.43 and the Inverter Sub-Assembly Trap

Solar photovoltaic module imports into the US in 2026 face a four-layer compliance and duty stack: HTS classification, Section 201 safeguard, Section 301 if Chinese origin, Section 122 reciprocal, plus AD/CVD on Chinese cells and a UFLPA detention risk on polysilicon supply chains. For mid-market solar installers and EPC contractors, getting the import right is the difference between an installable project pipeline and a stalled multi-million-dollar inventory waiting for customs release.

This guide covers the HTS 8541 classification, the Section 201 safeguard, the AD/CVD posture, the UFLPA traceability requirement, and worked tariff math for typical Asian and Latin American module suppliers.

Heading 8541 in brief

HTS 8541 covers photosensitive semiconductor devices and light-emitting diodes. Subheadings:

• 8541.10 to 8541.30: diodes, transistors, similar semiconductor devices (non-photovoltaic).
• 8541.42: photovoltaic cells, not assembled in modules. Bare cell shipments.
• 8541.43: photovoltaic cells assembled in modules or made up into panels. The standard finished solar panel.
• 8541.49: other photosensitive semiconductor devices.
• 8541.50 to 8541.90: other devices.

The relevant lines for solar imports are 8541.42 (cells alone) and 8541.43 (assembled modules). The split matters because Section 201 safeguard treatment differs, AD/CVD applies differently, and the UFLPA priority-commodity flag triggers differently.

Module vs cell

A bare cell is HTS 8541.42. The cell is the photovoltaic semiconductor wafer with metal contacts, ready to be assembled into a module.

An assembled module is HTS 8541.43. The module integrates multiple cells with bus bar interconnects, lamination layers (EVA), front glass, back-sheet, framing (typically aluminum), and the junction box for DC output.

The 8541.43 module is what most importers buy and install. Bare cells are sold to module assemblers, who are typically the manufacturer themselves, not separate market participants.

Section 201 safeguard

The Section 201 safeguard on crystalline-silicon photovoltaic (CSPV) modules has been in force since February 2018. Initial rate was 30 percent. The rate stepped down 5 percentage points annually under the original proclamation, but was extended in 2022 to maintain effective protection. Current rate in 2026: 14.25 percent ad valorem on most CSPV modules.

Bifacial modules: initial exclusion granted in 2019 was rescinded in 2020 (later upheld by CIT). Bifacial modules now pay the same 14.25 percent.

Coverage:

• HTS 8541.43 CSPV modules
• HTS 8541.42 CSPV cells (a separate within-quota / over-quota allocation applies)

Thin-film modules (CdTe, CIGS, a-Si) are NOT in Section 201 scope. First Solar (US producer of CdTe) is the largest single-manufacturer beneficiary of the exclusion.

Worked example: Vietnamese CSPV module

A US installer imports 50,000 USD of HTS 8541.43 modules from a Vietnamese assembly plant. Cells sourced from Korea, polysilicon from US producer.

Effective rate 28.6 percent. The Section 201 plus Section 122 stack is the binding duty layer.

UFLPA risk: low because the polysilicon is US-sourced. Documentation of polysilicon origin is still required at the border but the source documentation is clean.

Worked example: Chinese CSPV module direct

50,000 USD of Chinese-direct CSPV modules. Chinese polysilicon, Chinese cells, Chinese assembly.

Effective rate 54.1 percent. Plus UFLPA detention probability above 60 percent for a Chinese-direct module.

In practice, direct Chinese CSPV imports have nearly vanished from US trade flows since 2022 because of the combination of AD/CVD, Section 201, UFLPA risk, and now Section 122.

Worked example: Mexican-assembled CSPV module

50,000 USD of Mexican-assembled CSPV modules. Cells from Korean Hanwha Qcells, polysilicon US-sourced. Mexican framing and labor.

Effective rate 14.6 percent. Mexican-assembled modules win on landed cost vs Vietnamese assembly (33.6 percent) by the size of the Vietnam Section 122. Section 201 still applies regardless of USMCA qualification because Section 201 is a separate statutory authority unaffected by FTA tariff preferences.

UFLPA traceability

For solar imports specifically, CBP detains shipments routinely to verify polysilicon source. Documentation expected:

1. Module-to-cell trace: cell maker name and facility, cell production batch numbers.
2. Cell-to-wafer trace: wafer producer, wafer batch numbers.
3. Wafer-to-polysilicon trace: polysilicon producer, polysilicon batch numbers.
4. Polysilicon-to-MGS trace: metallurgical-grade silicon producer and source country.
5. Independent third-party audit of the polysilicon and MGS facilities.

Total documentation: 50 to 200 pages per shipment for a clean rebuttal package.

Suppliers from outside China who source polysilicon from US (Hemlock Semiconductor, REC Silicon) or Korean (OCI) producers have the cleanest UFLPA documentation. Wacker (German polysilicon) is also clean. Chinese polysilicon producers vary widely by facility; entity-list checking at the supplier level is mandatory before purchase.

Bifacial module specifics

Bifacial CSPV modules (collecting light from both sides) were originally excluded from Section 201 in November 2019. The exclusion was rescinded by USTR in October 2020 and upheld by CIT in 2023. As of 2026, bifacial modules pay the same Section 201 safeguard as monofacial.

The 2023 USTR proclamation also clarified that bifacial-equivalent modules using technologies designed to evade the bifacial classification (single-sided modules with rear-side specifications) are still treated as CSPV modules for Section 201 purposes.

Run your solar module entry now

The LandedFees calculator handles 8541.43 with Section 201 at the current rate, the active AD/CVD orders on Chinese cells, the polysilicon UFLPA flag, and the country-specific Section 122. Useful for sourcing comparisons and for project cost modeling on MW-scale procurement.

Calculate a solar module entry

Section 122 status as of June 20 2026

The May 7 2026 Court of International Trade ruling in Oregon v. United States (consolidated with Burlap and Barrel v. United States) struck down the Section 122 proclamation. The Federal Circuit issued an administrative stay on May 12 2026, so CBP is still collecting the duty pending appeal. Importers paying now should preserve protest rights and refund claims in case the government loses on the merits. The underlying Section 122 authority sunsets July 24 2026 under the statutory 150-day ceiling, regardless of the appeal outcome, unless Congress extends or a fresh proclamation restarts the clock.

Citations

• USITC Harmonized Tariff Schedule heading 8541: https://hts.usitc.gov/?query=8541
• Section 201 safeguard original proclamation 2018: Federal Register
• Section 201 extension 2022: Presidential Proclamation
• USTR bifacial module ruling 2020 and 2023: USTR press releases
• DHS UFLPA entity list (polysilicon category): https://www.dhs.gov/uflpa-entity-list
• Commerce ADCVD orders on Chinese solar cells: https://access.trade.gov