HTS Chapter 31 tariff rates (headings 3101–3105), 2026
Chapter 31 has 24 tariff lines across 5 headings. 24 (100%) enter duty-free at the general (MFN) rate, and 24 are on a Section 301 list, so products of China pay an extra duty on top.
24 tariff lines, USITC 2026HTSRev19. Specific or compound = a rate per unit (e.g. ¢/kg), not a percentage.
Section 301 China lists in chapter 31
| List | Duty for products of China | Lines |
|---|---|---|
| List 3 | Base rate + 25% | 24 |
Highest general duty rates in chapter 31
| HTS code | Description | General rate | Section 301 |
|---|---|---|---|
3101.00.00.00 | 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 | Free | List 3 (+25%) |
3102.10.00 | Urea, whether or not in aqueous solution | Free | List 3 (+25%) |
3102.21.00.00 | Ammonium sulfate | Free | List 3 (+25%) |
3102.29.00.00 | Other | Free | List 3 (+25%) |
3102.30.00.00 | Ammonium nitrate, whether or not in aqueous solution | Free | List 3 (+25%) |
3102.40.00.00 | Mixtures of ammonium nitrate with calcium carbonate or other inorganic nonfertilizing substances | Free | List 3 (+25%) |
All headings in chapter 31
| Heading | Description | Lines | Duty-free | Top rate | On 301 |
|---|---|---|---|---|---|
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 | 1 | 0% | 1 |
3102 | Mineral or chemical fertilizers, nitrogenous: | 9 | 9 | 0% | 9 |
3103 | Mineral or chemical fertilizers, phosphatic: | 3 | 3 | 0% | 3 |
3104 | Mineral or chemical fertilizers, potassic: | 3 | 3 | 0% | 3 |
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 | 8 | 0% | 8 |
General rates apply to most countries; free-trade partners can qualify for the special rate, and Column 2 applies to a few countries. Other duties (Section 232, antidumping/countervailing, other Chapter 99 measures) can also apply. Always confirm a classification with CBP or a licensed customs broker.
How to check any single code in seconds: How to check any US tariff rate by HTS code. Chapter 30 · Chapter 32 · All chapters