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Tandom · Duty calculator
HTS 3920.30.00.00 is the U.S. Harmonized Tariff Schedule classification for Of polymers of styrene. It's a 10-digit statistical line in Chapter 39: Plastics and articles thereof, Section VII: Plastics and Articles Thereof; Rubber and Articles Thereof, used by U.S. Customs and Border Protection to determine the duty rate at entry. 2 potentially relevant AD/CVD order flags link to this code.
New to HTS codes? Read our guide on how HTS classification works →
HTS-linked orders that may be relevant to imports under this code. An HTS link is a screening aid; actual coverage depends on each order's written product scope. Run the AD/CVD lookup → to check whether your specific shipment is in scope.
Past CBP decisions classifying real products under this HTS code. Useful precedent when classifying a similar product — each ruling shows how CBP interpreted the code for a specific case.
The tariff classification of plastic sheets from Denmark
The tariff classification of decorative panel products and edgebanding material from Italy
The tariff classification and status under the North American Free Trade Agreement (NAFTA) of artists’ panels from Canada; Article 509
The tariff classification of plastic interconnecting cubes and tiles.
The tariff classification of teaching aids from China.
Source: CBP CROSS (view all rulings on rulings.cbp.gov →)
HTS 3920.30.00.00 is the U.S. Harmonized Tariff Schedule classification for Of polymers of styrene. It belongs to Chapter 39 of the HTSUS.
The general (Column 1) duty rate for HTS 3920.30.00.00 is 5.8%. This is the most-favored-nation (MFN) rate that applies to imports from World Trade Organization member countries.
The HTS special-rate notation for 3920.30.00.00 is Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG). It can reference programs such as USMCA, KORUS, AGOA, and GSP; a program must be authorized on the entry date, and the shipment must satisfy its rules of origin and documentation requirements before a special rate can be claimed.
The Column 2 rate for HTS 3920.30.00.00 is 35%. This rate applies to imports from countries that do not have normal trade relations with the United States (currently Belarus, Cuba, North Korea, and Russia).
No Chapter 99 flags are linked to HTS 3920.30.00.00 in Tandom's current catalog view. Use the calculator's date, origin, and product inputs to check a specific entry scenario.
Tandom links 2 potentially relevant AD/CVD order flags to this code: A-570-075 (AD, China), C-570-076 (CVD, China). An HTS link is a screening aid; review each order's written scope and linked case materials to determine whether a product is covered.
Programs referenced by the HTS Special-column notation
Special-column notation identifies rate candidates only. The shipment must independently satisfy the program's current authorization, origin, and documentation rules before a special rate can be claimed.
Tandom guides relevant to this code
Where trade compliance APIs fit in a broker's filing pipeline: HTS classification, duty calculation, AD/CVD scope match, and post-summary corrections.
Open resource
Cash deposit cascade, separate rates, all-others, and PRC-wide rates. Worked example on case A-570-910 (galvanized welded steel pipe from China) with three exporter-specific rates.
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Scope text is authoritative; the HTS list is illustrative. Read scope, find past rulings, and file a 19 CFR 351.225 inquiry. Worked example on case A-570-106 (wooden cabinets from China).
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Run thousands of product descriptions through HTS classification, score the confidence, and triage borderline rows. Public search endpoint plus the closed-beta three-layer Classifier.
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How to read, order, and report Chapter 99 HTS codes alongside the base classification on a US entry summary in 2026. The full stacking ladder for brokers and compliance teams.
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Why raw LLM prompts fabricate stat suffixes, why MCP-augmented prompts do not, and the prompt template a broker can hand to Claude or ChatGPT today.
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