Chapter 31 HS Codes: Chapter 31 Commodities
CHAPTER DEFINITION & SCOPE
HS Chapter 31 of the WCO Harmonized System covers chapter 31 commodities. It groups 5 4-digit WCO headings and 24 6-digit subheadings under the official 2026 customs nomenclature [USITC HTS 2026].
Chapter
Ch 31
Headings
5 Headings
Subheadings
24 HS6
US Tariff Status
Active 2026
Chapter 31 4-Digit Headings Directory
| Heading | WCO Heading Description | Subheading Count | Directory Link |
|---|---|---|---|
| Heading 3101 | Animal or vegetable fertilizers, whether or not mixed together or chemically treated; fertilizers produced by the mixing or chemical treatment of animal or vegetable products | 1 subheadings | Browse Heading 3101 → |
| Heading 3102 | Mineral or chemical fertilizers, nitrogenous | 9 subheadings | Browse Heading 3102 → |
| Heading 3103 | Mineral or chemical fertilizers, phosphatic | 3 subheadings | Browse Heading 3103 → |
| Heading 3104 | Mineral or chemical fertilizers, potassic | 3 subheadings | Browse Heading 3104 → |
| Heading 3105 | Mineral or chemical fertilizers containing two or three of the fertilizing elements nitrogen, phosphorus and potassium; other fertilizers; goods of this chapter in tablets or similar forms or in packages of a gross weight not exceeding 10 kg | 8 subheadings | Browse Heading 3105 → |
Chapter 31 Subheading Sample & MFN Duty Rates
| HS Code | Subheading Description | Heading | Action |
|---|---|---|---|
| 3101.00 | Animal or vegetable fertilizers, whether or not mixed together or chemically treated; fertilizers produced by the mixing or chemical treatment of animal or vegetable products | 3101 | View 3101.00 → |
| 3102.10 | Mineral or chemical fertilizers, nitrogenous, Urea, whether or not in aqueous solution | 3102 | View 3102.10 → |
| 3102.21 | Mineral or chemical fertilizers, nitrogenous, Ammonium sulfate; double salts and mixtures of ammonium sulfate and ammonium nitrate, Ammonium sulfate | 3102 | View 3102.21 → |
| 3102.29 | Mineral or chemical fertilizers, nitrogenous, Ammonium sulfate; double salts and mixtures of ammonium sulfate and ammonium nitrate, Other | 3102 | View 3102.29 → |
| 3102.30 | Mineral or chemical fertilizers, nitrogenous, Ammonium nitrate, whether or not in aqueous solution | 3102 | View 3102.30 → |
| 3102.40 | Mineral or chemical fertilizers, nitrogenous, Mixtures of ammonium nitrate with calcium carbonate or other inorganic nonfertilizing substances | 3102 | View 3102.40 → |
| 3102.50 | Mineral or chemical fertilizers, nitrogenous, Sodium nitrate | 3102 | View 3102.50 → |
| 3102.60 | Mineral or chemical fertilizers, nitrogenous, Double salts and mixtures of calcium nitrate and ammonium nitrate | 3102 | View 3102.60 → |
| 3102.80 | Mineral or chemical fertilizers, nitrogenous, Mixtures of urea and ammonium nitrate in aqueous or ammoniacal solution | 3102 | View 3102.80 → |
| 3102.90 | Mineral or chemical fertilizers, nitrogenous, Other, including mixtures not specified in the foregoing subheadings | 3102 | View 3102.90 → |
| 3103.11 | Mineral or chemical fertilizers, phosphatic, Superphosphates, Containing by weight 35 percent or more of diphosphorous pentaoxide (P2O5) | 3103 | View 3103.11 → |
| 3103.19 | Mineral or chemical fertilizers, phosphatic, Superphosphates, Other | 3103 | View 3103.19 → |
| 3103.90 | Mineral or chemical fertilizers, phosphatic, Other | 3103 | View 3103.90 → |
| 3104.20 | Mineral or chemical fertilizers, potassic, Potassium chloride | 3104 | View 3104.20 → |
| 3104.30 | Mineral or chemical fertilizers, potassic, Potassium sulfate | 3104 | View 3104.30 → |
EXPERT CLASSIFICATION PRO TIPS
Common Pitfalls When Classifying Chapter 31 Goods
- Always review WCO Section and Chapter Legal Notes before assigning 4-digit headings.
- Distinguish carefully between unprocessed raw materials and further prepared or processed articles.
- Verify Partner Government Agency (PGA) flags for agriculture, food, or chemical items.
- Cross-reference official CBP CROSS rulings for binding precedents on mixed or composite goods.
Official Primary Sources & Authority References
USITC HTS Chapter 31 Tariff ↗
United States International Trade Commission official Harmonized Tariff Schedule.
CBP CROSS Rulings ↗
Customs Rulings Online Search System for Chapter 31 binding classification precedents.
WCO HS Nomenclature ↗
World Customs Organization international 6-digit Harmonized System backbone standard.
U.S. Census Foreign Trade ↗
U.S. Census Bureau trade statistics and Schedule B concordance portal.
Chapter 31 Frequently Asked Questions (FAQ)
What commodities are covered under HS Chapter 31?
Chapter 31 (Chapter 31 Commodities) covers WCO Harmonized System 4-digit headings from 3101 upward, encompassing primary goods, raw materials, and manufactured articles within this nomenclature section.
How many 4-digit headings exist in HS Chapter 31?
Chapter 31 contains 5 official 4-digit WCO headings and 24 6-digit tariff subheadings.
What is the US general import duty range for Chapter 31 commodities?
Base customs duties under Chapter 31 range from 0.0% (Duty-Free) up to representative MFN rate limits depending on 10-digit HTS statistical suffix extensions.
Do Section 301 China tariffs apply to Chapter 31 imports?
Section 301 tariffs depend on specific 8-digit HTS subheadings. Importers must verify if their exact HTS code appears on USTR Lists 1 through 4A.
Are Partner Government Agency (PGA) permits required for Chapter 31?
PGA message-set flags (such as FDA, USDA APHIS, EPA, or CITES) apply conditionally depending on the commodity classification within Chapter 31.
How are products classified between adjacent headings in Chapter 31?
Classification follows WCO General Rules of Interpretation (GRI) 1 through 6, prioritizing specific heading terms over general descriptions.
Can Chapter 31 goods enter duty-free under USMCA or Free Trade Agreements?
Yes. Eligible goods originating in USMCA member states (US, Mexico, Canada) or FTA partners enter duty-free under SPI code P, KR, AU, or CL with a valid Certificate of Origin.
What is the Section 321 de minimis limit for Chapter 31 shipments?
Eligible commercial shipments valued at $800 USD or less imported by one person on one day may enter duty-free under 19 U.S.C. 1321.
What documents are required for formal entry of Chapter 31 goods?
Commercial Invoice, Packing List, Bill of Lading/Air Waybill, and entry summary CBP Form 7501 are mandatory for entries exceeding $2,500 USD.
How can an importer obtain a binding CBP ruling for Chapter 31?
Importers may submit an e-Ruling application under 19 CFR Part 177 to CBP National Commodity Specialist Division.