UPDATE: Section 122 tariff (10%) in effect since Feb 24 — expires ~July 24 (~126 days). 24 states challenge in court (March 5). USTR launches new Section 301 probes (March 11). EU trade deal vote imminent. Full analysis →

HTS 3903 — Polystyrene in primary forms Tariff Rate (2026)

Polymers of styrene in primary forms. Used in packaging, insulation, and disposable food containers.

Duty Rates

6.5%

MFN Rate

10%

Section 122

N/A

Section 232

25%

Section 301 (China)

Top Countries of Origin

HTS heading 3903 covers polystyrene in primary forms, entering the United States at a 6.5% MFN duty rate. Polymers of styrene in primary forms. Used in packaging, insulation, and disposable food containers. All imports under this heading are subject to the 10% Section 122 tariff (effective February 24, 2026). Chinese imports face an additional Section 301 tariff of 25%. The top countries of origin for HTS 3903 imports include KR, TW, MX, CN, TH. Tariff rates vary by source country based on applicable trade agreements and special tariff programs.

Frequently Asked Questions

What is the tariff rate for HTS 3903 (Polystyrene in primary forms)?

The MFN duty rate for HTS 3903 is 6.5%. All imports also face the 10% Section 122 tariff. China Section 301: 25%.

Where do most HTS 3903 imports come from?

The top origin countries for polystyrene in primary forms are KR, TW, MX, CN, TH. Tariff rates vary based on the source country's trade agreements and applicable surcharges.

Will the tariff on HTS 3903 change in 2026?

The 10% Section 122 tariff expires approximately July 24, 2026 unless Congress acts. MFN rates and Section 232/301 tariffs have no set expiration. Monitor legislative and executive actions for changes.