HTS heading 2918 · Chapter 29

HTS 2918: Carboxylic acids with additional oxygen function and…

HTS heading 2918 covers carboxylic acids with additional oxygen function and their anhydrides, halides, peroxides and peroxyacids; their halogenated, sulfonated, nitrated or nitrosated derivatives. It has 56 tariff lines with a duty rate; the general (MFN) rates are 6.5% (27 lines), Free (11 lines), 5.8% (6 lines) and others.

Imports may also owe Chapter 99 tariffs (Section 232, 301 or 201) depending on origin and date, plus the Merchandise Processing Fee and, by sea, the Harbor Maintenance Fee.

Rates from the 2026 HTS Revision 22, effective October 30, 2026. Source: U.S. International Trade Commission.

HTS code

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Tariff lines and duty rates

HTS code	Description	General	Special	Column 2	Estimate
	Carboxylic acids with alcohol function but without other oxygen function, their anhydrides, halides, peroxides, peroxyacids and their derivatives:
2918.11	Lactic acid, its salts and esters:
2918.11.10.00	Lactic acid[kg]	5.1%	Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)	35%	Estimate →
2918.11.51.00	Other[kg]	3.4%	Free (A,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG)	25%	Estimate →
2918.12.00.00	Tartaric acid[kg]	Free		17%	Estimate →
2918.13	Salts and esters of tartaric acid:
2918.13.10.00	Potassium antimony tartrate (Tartar emetic)[kg]	Free		4%	Estimate →
2918.13.20.00	Potassium bitartrate (Cream of tartar)[kg]	Free		11%	Estimate →
2918.13.30.00	Potassium sodium tartrate (Rochelle salts)[kg]	Free		11.5%	Estimate →
2918.13.50.00	Other[kg]	4.4%	Free (A,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG)	25%	Estimate →
2918.14.00.00	Citric acid[kg]	6%	Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)	39.5%	Estimate →
2918.15	Salts and esters of citric acid:
2918.15.10.00	Sodium citrate[kg]	6.5%	Free (A*,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)	42%	Estimate →
2918.15.50.00	Other[kg]	3.7%	Free (A*,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)	25%	Estimate →
2918.16	Gluconic acid, its salts and esters:
2918.16.10.00	Gluconic acid[kg]	6%	Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)	25%	Estimate →
2918.16.50	Other	3.7%	Free (A,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG)	25%
2918.16.50.10	Sodium gluconate[kg]				Estimate →
2918.16.50.20	Calcium gluconate[kg]				Estimate →
2918.16.50.90	Other[kg]				Estimate →
2918.17.00.01	2,2-Diphenyl-2-hydroxyacetic acid (benzilic acid)[kg]	5.8%	Free (A+,AU,BH,CL,CO,D, E,IL,JO, KR,MA,OM,P, PA,PE,S,SG)	15.4¢/kg + 40%	Estimate →
2918.18.00.00	Chlorobenzilate (ISO)[kg]	6.5%	Free (A+,AU,BH,CL,CO,D, E,IL,JO,K, KR,L,MA,OM,P, PA,PE,S,SG)	15.4¢/kg + 57%	Estimate →
2918.19	Other:
	Aromatic:
2918.19.11.00	Benzilic acid, methyl ester[kg]	5.8%	Free (A+,AU,BH,CL,CO,D, E,IL,JO, KR,MA,OM,P, PA,PE,S,SG)	15.4¢/kg + 40%	Estimate →
	Phenylglycolic acid (Mandelic acid), its salts and esters:
2918.19.12.00	Mandelic acid[kg]	Free		15.4¢/kg + 67.5%	Estimate →
2918.19.15.00	Other[kg]	6.5%	Free (A+,AU,BH,CL,CO,D, E,IL,JO, K,KR,MA,OM,P, PA,PE,S,SG)	15.4¢/kg + 67.5%	Estimate →
	Other:
2918.19.20.00	Products described in additional U.S. note 3 to section VI[kg]	6.5%	Free (A+,AU,BH,CL,CO,D, E,IL,JO,K, KR,L,MA,OM,P, PA,PE,S,SG)	15.4¢/kg + 57%	Estimate →
2918.19.31.00	Other[kg]	6.5%	Free (A+,AU,BH,CL,CO,D, E,IL,JO,K, KR,L,MA,OM,P, PA,PE,S,SG)	15.4¢/kg + 57%	Estimate →
	Other:
2918.19.60.00	Malic acid[kg]	4%	Free (A,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG)	25%	Estimate →
2918.19.90.00	Other[kg]	4%	Free (A+,AU,BH,CL,CO,D, E,IL,JO,K, KR,MA,OM,P, PA,PE,S,SG)	25%	Estimate →
	Carboxylic acids with phenol function but without other oxygen function, their anhydrides, halides, peroxides, peroxyacids and their derivatives:
2918.21	Salicylic acid and its salts:
2918.21.10.00	Suitable for medicinal use[kg]	6.5%	Free (A*,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)	15.4¢/kg + 72%	Estimate →
2918.21.50.00	Other[kg]	6.5%	Free (A*,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)	15.4¢/kg + 57%	Estimate →
2918.22	O-Acetylsalicylic acid, its salts and esters:
2918.22.10.00	O-Acetylsalicylic acid (Aspirin)[kg]	6.5%	Free (A*,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)	15.4¢/kg + 82%	Estimate →
2918.22.50.00	Salts and esters of O-acetylsalicylic acid[kg]	6.5%	Free (A*,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG)	15.4¢/kg + 47.5%	Estimate →
2918.23	Other esters of salicylic acid and their salts:
2918.23.10.00	Salol (Phenyl salicylate) suitable for medicinal use[kg]	6.5%	Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)	15.4¢/kg + 45%	Estimate →
	Other:
2918.23.20.00	Odoriferous or flavoring compounds[kg]	6.5%	Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)	15.4¢/kg + 58%	Estimate →
	Other:
2918.23.30.00	Products described in additional U.S. note 3 to section VI[kg]	6.5%	Free (A+,AU,BH,CL,CO,D, E,IL,JO,K, KR,MA,OM,P, PA,PE,S,SG)	15.4¢/kg + 57%	Estimate →
2918.23.50.00	Other[kg]	6.5%	Free (A+,AU,BH,CL,CO,D, E,IL,JO,K, KR,MA,OM,P, PA,PE,S,SG)	15.4¢/kg + 57%	Estimate →
2918.29	Other:
2918.29.04.00	2,3-Cresotic acid; 2-Hydroxybenzoic acid, calcium salt; 1-Hydroxy-2-naphthoic acid; 2-Hydroxy-1-naphthoic acid; 1-Hydroxy-2-naphthoic acid, phenyl ester;α-Resorcylic acid;γ-Resorcylic acid; and 5-Sulfosalicylic acid[kg]	5.8%	Free (A+,AU,BH,CL,CO,D,E,IL,JO,KR,L,MA,OM,P,PA,PE,S,SG)	15.4¢/kg + 40%	Estimate →
2918.29.06.00	1,6-Hexanediol bis(3,5-dibutyl-4-hydroxyphenyl)propionate)[kg]	5.8%	Free (A+,AU,BH,CL,CO,D,E, IL,JO,KR,MA,OM,P, PA,PE,S,SG)	15.4¢/kg + 40%	Estimate →
2918.29.08.00	m-Hydroxybenzoic acid[kg]	Free		15.4¢/kg + 40%	Estimate →
2918.29.20.00	Gentisic acid; and Hydroxycinnamic acid and its salts[kg]	6.5%	Free (A+,AU,BH,CL,CO,D, E,IL,JO,K, KR,MA,OM,P, PA,PE,S,SG)	15.4¢/kg + 48.5%	Estimate →
2918.29.22.00	p-Hydroxybenzoic acid[kg]	6.5%	Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)	15.4¢/kg + 48.5%	Estimate →
2918.29.25.00	3-Hydroxy-2-naphthoic acid[kg]	6.5%	Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,L,MA,OM,P,PA,PE,S,SG)	15.4¢/kg + 57%	Estimate →
2918.29.30.00	Gallic acid[kg]	1%	Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)	2%	Estimate →
2918.29.39.00	4,4-Bis(4-hydroxyphenyl) pentanoic acid; and 3,5,6-Trichlorosalicylic acid[kg]	Free		15.4¢/kg + 57%	Estimate →
	Other:
2918.29.65.00	Products described in additional U.S. note 3 to section VI[kg]	6.5%	Free (A+,AU,BH,CL,CO,D, E,IL,JO,K, KR,L,MA,OM,P, PA,PE,S,SG)	15.4¢/kg + 57%	Estimate →
2918.29.75.00	Other[kg]	6.5%	Free (A+,AU,BH,CL,CO,D, E,IL,JO,K, KR,L,MA,OM,P, PA,PE,S,SG)	15.4¢/kg + 57%	Estimate →
2918.30	Carboxylic acids with aldehyde or ketone function but without other oxygen function, their anhydrides, halides, peroxides, peroxyacids and their derivatives:
	Aromatic:
2918.30.10.00	1-Formylphenylacetic acid, methyl ester[kg]	5.8%	Free (A+,AU,BH,CL,CO,D, E,IL,JO, KR,MA,OM,P, PA,PE,S,SG)	15.4¢/kg + 40%	Estimate →
2918.30.15.00	2-Chloro-4,5-difluoro-ß-oxobenzenepropanoic acid, ethyl ester; and Ethyl 2-keto-4-phenylbutanoate[kg]	Free		15.4¢/kg + 57%	Estimate →
	Other:
2918.30.25	Products described in additional U.S. note 3 to section VI	6.5%	Free (A+,AU,BH,CL,CO,D, E,IL,JO,K, KR,MA,OM,P, PA,PE,S,SG)	15.4¢/kg + 57%
2918.30.25.10	Methyl 3-oxo-2-phenylbutanoate (methyl alpha-phenylacetoacetate, MAPA)[kg]				Estimate →
2918.30.25.50	Other[kg]				Estimate →
2918.30.30.00	Other[kg]	6.5%	Free (A+,AU,BH,CL,CO,D, E,IL,JO,K, KR,MA,OM,P, PA,PE,S,SG)	15.4¢/kg + 57%	Estimate →
	Other:
2918.30.70.00	Dimethyl acetyl succinate; Oxalacetic acid diethyl ester, sodium salt; 4,4,4-Trifluoro-3-oxobutanoic acid, ethyl ester; and 4,4,4-Trifluoro-3-oxobutanoic acid, methyl ester[kg]	Free		25%	Estimate →
2918.30.90.00	Other[kg]	3.7%	Free (A*,AU,BH,CL,CO,D,E,IL,JO,K,KR,L,MA,OM,P,PA,PE,S,SG)	25%	Estimate →
	Other:
2918.91.00.00	2,4,5-T (ISO) (2,4,5-trichlorophenoxyacetic acid), its salts and esters[kg]	6.5%	Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)	15.4¢/kg + 48.5%	Estimate →
2918.99	Other:
	Aromatic:
2918.99.05.00	p-Anisic acid; Clofibrate; and 3-Phenoxybenzoic acid[kg]	5.8%	Free (A+,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG)	15.4¢/kg + 40%	Estimate →
2918.99.06.00	1-Hydroxy-6-octadecyloxy-2-naphthalene- carboxylic acid; and 1-Hydroxy-6-docosyloxy-2-naphthalene- carboxylic acid[kg]	Free		15.4¢/kg + 57%	Estimate →
2918.99.14.00	2-(4-Chloro-2-methylphenoxy)propionic acid and its salts[kg]	Free		15.4¢/kg + 40.5%	Estimate →
	Other:
	Pesticides:
2918.99.18.00	4-(4-Chloro-2-methylphenoxy) butyric acid;p-Chlorophenoxyacetic acid; and 2-(2,4-Dichlorophenoxy) propionic acid[kg]	6.5%	Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)	15.4¢/kg + 40.5%	Estimate →
2918.99.20	Other	6.5%	Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)	15.4¢/kg + 48.5%
2918.99.20.10	2,4-Dichlorophenoxyacetic acid, its salts and esters[kg]				Estimate →
2918.99.20.15	2-Methyl-4-chlorophenoxyacetic acid[kg]				Estimate →
2918.99.20.50	Other[kg]				Estimate →
2918.99.30.00	Drugs[kg]	6.5%	Free (A,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG)	15.4¢/kg + 47.5%	Estimate →
2918.99.35.00	Odoriferous or flavoring compounds[kg]	6.5%	Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)	15.4¢/kg + 58%	Estimate →
	Other:
2918.99.43	Products described in additional U.S. note 3 to section VI	6.5%	Free (A+,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG)	15.4¢/kg + 57%
2918.99.43.10	2-Methyl-3-phenyloxirane-2-carboxylic acid (P-2-P methyl glycidic acid), its salts and esters[kg]				Estimate →
2918.99.43.50	Other[kg]				Estimate →
2918.99.47.00	Other[kg]	6.5%	Free (A+,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG)	15.4¢/kg + 57%	Estimate →
2918.99.50.00	Other[kg]	4%	Free (A,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG)	25%	Estimate →
	VIII. ESTERS OF INORGANIC ACIDS OF NONMETALS AND THEIR SALTS, AND THEIR HALOGENATED, SULFONATED, NITRATED OR NITROSATED DERIVATIVES

66 lines shown. Statistical suffixes (the last two digits) inherit the rate of the 8-digit subheading above them.

Example: base duty and fees on $10000

For HTS 2918.11.10.00 at the general rate of 5.1%, shipped by ocean, before any Chapter 99 tariffs:

Base duty (5.1%)	$510.00
Merchandise Processing Fee (0.3464%, min $34.58)	$34.64
Harbor Maintenance Fee (0.125%)	$12.50
Duty and fees	$557.14

Origin-specific tariffs can multiply this. Run this example from China or from Mexico to see every line.

Special program codes in this heading

A, A*, A+: Generalized System of Preferences (GSP)
AU: U.S.–Australia FTA
BH: U.S.–Bahrain FTA
CL: U.S.–Chile FTA
CO: U.S.–Colombia Trade Promotion Agreement
D: African Growth and Opportunity Act (AGOA)
E, E*: Caribbean Basin Economic Recovery Act
IL: U.S.–Israel FTA
JO: U.S.–Jordan FTA
K: Agreement on Trade in Pharmaceutical Products
KR: U.S.–Korea FTA (KORUS)
L: Uruguay Round concessions on intermediate chemicals for dyes
MA: U.S.–Morocco FTA
OM: U.S.–Oman FTA
P, P+: CAFTA-DR
PA: U.S.–Panama Trade Promotion Agreement
PE: U.S.–Peru Trade Promotion Agreement
S, S+: USMCA (United States–Mexico–Canada Agreement)
SG: U.S.–Singapore FTA

A special rate applies only when the goods qualify under that program's rules of origin and the claim is made at entry.

Frequently asked questions

What is the duty rate for HTS 2918?

Heading 2918 has 56 rate lines. The general (MFN) duty rates are 6.5% (27 lines), Free (11 lines), 5.8% (6 lines), 3.7% (3 lines). Products of free trade agreement partners may enter at the special rate, and Column 2 rates apply to countries without normal trade relations. Chapter 99 tariffs can be added on top: calculate the full amount.

Do Section 301, 232 or 201 tariffs apply to HTS 2918?

It depends on the 8- or 10-digit subheading, the country of origin, the entry date and, for Section 232, the metal content. These additional duties are listed in Chapter 99 of the HTS. The free duty calculator checks each program for a given code, origin and date and shows which apply and why.

What fees are added to an import under HTS 2918?

Formal entries pay the Merchandise Processing Fee of 0.3464% of value (minimum $34.58, maximum $670.86 in FY2027). Ocean shipments also pay the Harbor Maintenance Fee of 0.125% of value. See the import duty calculator for how they combine.