Code 2918 99 · Heading 2918

Other carboxylic acids with additional oxygen-containing groups, and their derivatives

This code covers carboxylic acids with oxygen-containing groups other than the specifically listed alcohol, phenol, aldehyde or ketone groups, together with their anhydrides, halides, peroxides, peroxyacids and certain derivatives. It also includes 2,6-dimethoxybenzoic acid, dicamba and sodium phenoxyacetate.

For example

2,6-Dimethoxybenzoic acid
Dicamba
Sodium phenoxyacetate

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See the official tariff text

Official tariff text

Carboxylic acids with additional oxygen function and their anhydrides, halides, peroxides and peroxyacids; their halogenated, sulphonated, nitrated or nitrosated derivatives (excl. only with alcohol, phenol, aldehyde or ketone function, and 2,4,5-T [ISO] [2,4,5-trichlorophenoxyacetic acid] and its salts and esters)

The path to this code

Every code is reached through these choices, one level at a time.

Step 4 of 4

Step 1 · Section VI Products of the chemical or allied industries
Is it an inorganic or organic chemical; a pharmaceutical product; a fertilizer; a tanning or dye extract, pigment, paint, varnish, filler or printing ink; an essential oil, perfume, cosmetic or toilet product; soap, a surface-active, washing, cleaning, polishing or wax product; a protein, modified starch, glue or enzyme; an explosive, pyrotechnic article, match or other specified combustible material; a photographic or cinematographic product; or another chemical product?
✓
Step 2 · Chapter 29 Organic chemicals 2 of 11 chapters in section VI
What type of organic chemical is it—for example, a hydrocarbon, alcohol, acid, nitrogen compound, sulfur compound, heterocyclic compound, vitamin, hormone, glycoside, plant alkaloid, sugar, antibiotic or another listed organic compound?
✓
Step 3 · Heading 2918 Carboxylic acids with additional oxygen function an… 18 of 42 headings under chapter 29
Which listed substance or group is it: lactic acid or its salts and esters; tartaric acid; salts or esters of tartaric acid; citric acid; salts or esters of citric acid; gluconic acid or its salts and esters; benzilic acid; chlorobenzilate; other carboxylic acids containing alcohol groups; salicylic acid or its salts; o-acetylsalicylic acid or its salts and esters; other salicylic acid esters or their salts; carboxylic acids containing aldehyde or ketone groups; 2,4,5-T or its salts and esters; or another product covered by this heading?
✓
Step 4 · Subheading 2918 99 Carboxylic acids with additional oxygen function an… 16 of 16 subheadings under heading 2918
Is the product 2,6-dimethoxybenzoic acid, dicamba or sodium phenoxyacetate, rather than another product covered by this heading?

Full 8-digit codes

Pick the description that best matches your product.

2 codes below this one

Compare the sibling codes

Classification decides the rate here: from 0.0% to 6.5%.

2918 11 Lactic acid, its salts and esters (excl. inorganic or organic compounds of mercury) 6.5%
2918 12 Tartaric acid 6.5%
2918 13 Salts and esters of tartaric acid 6.5%
2918 14 Citric acid 6.5%
2918 15 Salts and esters of citric acid (excl. inorganic or organic compounds of mercury) 6.5%
2918 16 Gluconic acid, its salts and esters No rate on file
2918 17 2,2-Diphenyl-2-hydroxyacetic acid "benzilic acid" 6.5%
2918 18 Chlorobenzilate "ISO" 6.5%
2918 19 Carboxylic acids with additional oxygen function and their anhydrides, halides, peroxides and peroxyacids; their halogenated, sulphonated, nitrated or nitrosated derivatives (excl. lactic acid, tartaric acid, citric acid, gluconic acid and their salts and esters, and chlorobenzilate [ISO]) 0.0–6.5%
2918 21 Salicylic acid and its salts (excl. inorganic or organic compounds of mercury) 6.5%
2918 22 o-Acetylsalicylic acid, its salts and esters 0.0%
2918 23 Esters of salicylic acid and their salts (excl. o-acetylsalicylic acid, its salts and esters) 6.5%
2918 29 Carboxylic acids with phenol function but without other oxygen function, their anhydrides, halides, peroxides, peroxyacids and their halogenated, sulphonated, nitrated or nitrosated derivatives (excl. salicylic acid and o-Acetylsalicylic acid, and their salts and esters) No rate on file
2918 30 Carboxylic acids with aldehyde or ketone function but without other oxygen function, their anhydrides, halides, peroxides, peroxyacids and their halogenated, sulphonated, nitrated or nitrosated derivatives 6.5%
2918 91 2,4,5-T "ISO" "2,4,5-trichlorophenoxyacetic acid", its salts and esters 6.5%
2918 99 Carboxylic acids with additional oxygen function and their anhydrides, halides, peroxides and peroxyacids; their halogenated, sulphonated, nitrated or nitrosated derivatives (excl. only with alcohol, phenol, aldehyde or ketone function, and 2,4,5-T [ISO] [2,4,5-trichlorophenoxyacetic acid] and its salts and esters) you are here 0.0–6.5%

Export to Norway

What Norwegian customs charges when goods like these are imported into Norway.

29.18.9900

Other

Ordinary duty

Duty free

Goods of EU origin

Duty free You need documentation of EU origin to use this rate.

Norwegian tariff data version 1.5/1.2, last checked Aug. 3, 2026.

Contains data from Norwegian Customs (data.toll.no), licensed under CC BY 4.0, adapted for display.

Export to the United Kingdom

What UK customs charges when goods like these are imported into the UK.

2918 99 40 00

2,6-Dimethoxybenzoic acid; dicamba (ISO); sodium phenoxyacetate

Ordinary duty

Duty free

Goods of EU origin

Duty free You need documentation of EU preferential origin to use this rate.
2918 99 90 13

3-Methoxy-2-methylbenzoyl chloride (CAS RN 24487-91-0)

Ordinary duty

6.0%

Goods of EU origin

Duty free You need documentation of EU preferential origin to use this rate.
2918 99 90 15

Ethyl 2,3-epoxy-3-phenylbutyrate (CAS RN 77-83-8)

Ordinary duty

6.0%

Goods of EU origin

Duty free You need documentation of EU preferential origin to use this rate.
2918 99 90 18

Ethyl 2-hydroxy-2-(4-phenoxyphenyl)propanoate (CAS RN 132584-17-9)

Ordinary duty

6.0%

Goods of EU origin

Duty free You need documentation of EU preferential origin to use this rate.
2918 99 90 25

Methyl (E)-3-methoxy-2-(2-chloromethylphenyl)-2-propenoate (CAS RN 117428-51-0)

Ordinary duty

6.0%

Goods of EU origin

Duty free You need documentation of EU preferential origin to use this rate.
2918 99 90 27

Ethyl 3-ethoxypropionate (CAS RN 763-69-9)

Ordinary duty

6.0%

Goods of EU origin

Duty free You need documentation of EU preferential origin to use this rate.
2918 99 90 35

p-Anisic acid (CAS RN 100-09-4)

Ordinary duty

6.0%

Goods of EU origin

Duty free You need documentation of EU preferential origin to use this rate.
2918 99 90 38

Diclofop-methyl (ISO) (CAS RN 51338-27-3)

Ordinary duty

6.0%

Goods of EU origin

Duty free You need documentation of EU preferential origin to use this rate.

Show all 20 lines

2918 99 90 40

trans-4-Hydroxy-3-methoxycinnamic acid (CAS RN 1135-24-6)

Ordinary duty

6.0%

Goods of EU origin

Duty free You need documentation of EU preferential origin to use this rate.
2918 99 90 45

4-Methylcatechol dimethyl acetate (CAS RN 52589-39-6)

Ordinary duty

6.0%

Goods of EU origin

Duty free You need documentation of EU preferential origin to use this rate.
2918 99 90 48

2-Bromo-5-methoxybenzoic acid (CAS RN 22921-68-2) with a purity by weight of 98 % or more

Ordinary duty

6.0%

Goods of EU origin

Duty free You need documentation of EU preferential origin to use this rate.
2918 99 90 50

Methyl 3,4,5-trimethoxybenzoate (CAS RN 1916-07-0)

Ordinary duty

6.0%

Goods of EU origin

Duty free You need documentation of EU preferential origin to use this rate.
2918 99 90 58

2,4-D (ISO) (CAS RN 94-75-7) with a purity by weight of 98 % or more

Ordinary duty

6.0%

Goods of EU origin

Duty free You need documentation of EU preferential origin to use this rate.
2918 99 90 60

3,4,5-Trimethoxybenzoic acid (CAS RN 118-41-2)

Ordinary duty

6.0%

Goods of EU origin

Duty free You need documentation of EU preferential origin to use this rate.
2918 99 90 63

2-methyl-3-phenyloxirane-2-carboxylic acid (BMK glycidic acid) CAS No. 25547-51-7

Ordinary duty

6.0%

Goods of EU origin

Duty free You need documentation of EU preferential origin to use this rate.
2918 99 90 67

Allyl-(3-methylbutoxy)acetate (CAS RN 67634-00-8) with a purity by weight of 95 % or more

Ordinary duty

6.0%

Goods of EU origin

Duty free You need documentation of EU preferential origin to use this rate.
2918 99 90 73

Methyl (2R)-2-(4-hydroxyphenoxy)propionate (CAS RN 96562-58-2) with a purity by weight of 97 % or more

Ordinary duty

6.0%

Goods of EU origin

Duty free You need documentation of EU preferential origin to use this rate.
2918 99 90 78

3,4-Epoxycyclohexylmethyl-3',4'-epoxycyclohexane carboxylate (CAS RN 2386-87-0) with a purity by weight of 91 % or more

Ordinary duty

6.0%

Goods of EU origin

Duty free You need documentation of EU preferential origin to use this rate.
2918 99 90 85

Trinexapac-Ethyl (ISO) (CAS RN 95266-40-3) with a purity by weight of 96 % or more

Ordinary duty

6.0%

Goods of EU origin

Duty free You need documentation of EU preferential origin to use this rate.
2918 99 90 90

Other

Ordinary duty

Depends on the product details

Goods of EU origin

Duty free You need documentation of EU preferential origin to use this rate.

These rates apply in Great Britain. Different rules may apply for goods entering Northern Ireland.

UK tariff data version v4.0.1576, last checked Aug. 3, 2026.

Contains public sector information licensed under the Open Government Licence v3.0.

Source: UK Department for Business and Trade (data.api.trade.gov.uk).

Check the neighbouring codes

The codes just before and after this one, in case a nearby group fits better.

See all 16 codes at this level

Previous code 2918 91

2,4,5-T "ISO" "2,4,5-trichlorophenoxyacetic acid", its salts and este…

you are here 2918 99

Carboxylic acids with additional oxygen function and their anhydrides…

Duty rates shown here are estimates, read from official EU / Danish, Norwegian and UK tariff data for orientation only. Confirm the current rate with SKAT, TARIC, Norwegian Customs or the UK Online Trade Tariff before you file. The rate you pay can also depend on the country of origin. These are base customs duties only: import VAT, excise duties, anti-dumping duties and safeguard or quota measures are not included.