2918.99—Carboxylic acids with additional oxygen function and their anhydrides, halides, peroxides and peroxyacids; their halogenated, sulfonated, nitrated or nitrosated derivatives, other
General duty rate
Free – 6.5%
Across 12 10-digit lines; pick a line below for the exact rate
Coverage on this page
Plain-English explanation
HTS 2918.99 is a 6-digit subheading of the U.S. Harmonized Tariff Schedule covering Carboxylic acids with additional oxygen function and their anhydrides, halides, peroxides and peroxyacids; their halogenated, sulfonated, nitrated or nitrosated derivatives, other. It sits in Chapter 29: Organic chemicals, Section VI: Products of the Chemical or Allied Industries and rolls up 12 10-digit statistical lines, with general duty rates ranging from Free to 6.5%. 4 AD/CVD orders flag at least one child line.
10-digit lines under 2918.99(12)
Pick a line to view full rate detail and compute landed duty
2918.99.05.00p-Anisic acid; Clofibrate; and 3-Phenoxybenzoic acid5.8%2918.99.06.001-Hydroxy-6-octadecyloxy-2-naphthalene- carboxylic acid; and 1-Hydroxy-6-docosyloxy-2-naphthalene- carboxylic acidFree2918.99.14.002-(4-Chloro-2-methylphenoxy)propionic acid and its saltsFree2918.99.18.004-(4-Chloro-2-methylphenoxy) butyric acid;p-Chlorophenoxyacetic acid; and 2-(2,4-Dichlorophenoxy) propionic acid6.5%2918.99.20.102,4-Dichlorophenoxyacetic acid, its salts and esters6.5% 2918.99.20.152-Methyl-4-chlorophenoxyacetic acid6.5% 2918.99.20.50Other6.5% 2918.99.30.00Drugs6.5%2918.99.35.00Odoriferous or flavoring compounds6.5%2918.99.43.00Products described in additional U.S. note 3 to section VI6.5% 2918.99.47.00Other6.5%2918.99.50.00Other4% AD/CVD orders(4)
Antidumping or countervailing orders covering one or more lines under 2918.99
Frequently asked questions
What does HTS 2918.99 cover?
HTS 2918.99 is a 6-digit subheading of the U.S. Harmonized Tariff Schedule covering Carboxylic acids with additional oxygen function and their anhydrides, halides, peroxides and peroxyacids; their halogenated, sulfonated, nitrated or nitrosated derivatives, other. It belongs to Chapter 29 and rolls up 12 10-digit statistical lines that brokers actually file at entry.
What is the duty rate for HTS 2918.99?
General (Column 1) duty rates for the 10-digit lines under HTS 2918.99 range from Free to 6.5%. The exact rate depends on the specific 10-digit statistical line — pick a line below to see its full rate detail.
How do I find the right 10-digit line under HTS 2918.99?
U.S. Customs requires entries to be filed at the 10-digit statistical level — the broader subheading HTS 2918.99 is not directly fileable. Match your product description to the most specific 10-digit line in the list on this page; if multiple lines could apply, the General Rules of Interpretation (GRIs) and chapter notes determine which one governs.
Are there AD/CVD orders affecting HTS 2918.99?
Yes — 4 AD/CVD orders flag at least one 10-digit line under HTS 2918.99. Whether a specific shipment falls in scope depends on the country of origin and the order's scope determination. See compliance.tandom.ai for full coverage detail.
Learn more
Tandom guides relevant to this code
Trade compliance APIs in broker workflows
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
Find the right manufacturer or exporter rate in an AD/CVD order
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.
Open resource
Determine if a product is in scope of an AD/CVD order
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).
Open resource
Bulk-classify SKU descriptions with the Tandom HTS Classifier API
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.
Open resource
How Chapter 99 tariff layers stack on a single entry
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.
Open resource
Write a Claude or ChatGPT prompt for broker-grade HTS classification
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.
Open resource