# United States tariff lines under HS 3102.21

> The United States tariff splits HS 3102.21 (ammonium sulphate; double salts and mixtures of ammonium sulphate and ammonium nitrate: Ammonium sulphate) into 1 national line: 3102.21.00.00 (ammonium sulfate). Every United States line under 3102.21 is free of general (MFN) duty.

Source: https://border.bot/countries/united-states/hs-codes/310221
Last updated: 9 October 2026

[Countries](https://border.bot/countries) / [United States](https://border.bot/countries/united-states) / [Chapter 31](https://border.bot/countries/united-states/hs-codes/31) / [3102.21](https://border.bot/countries/united-states/hs-codes/310221)

## Key facts

- HS subheading: [3102.21](https://border.bot/hs-codes/310221)
- Duty (MFN): Free
- National lines: 1
- Tariff: [United States](https://border.bot/countries/united-states)
- Chapter: 31: Fertilisers

## United States lines under 3102.21

The United States tariff splits HS 3102.21 (ammonium sulphate; double salts and mixtures of ammonium sulphate and ammonium nitrate: Ammonium sulphate) into 1 national line: 3102.21.00.00 (ammonium sulfate).

Every United States line under 3102.21 is free of general (MFN) duty.

- [3102.21.00.00](https://border.bot/countries/united-states/hs-codes/3102210000) Ammonium sulfate; double salts and mixtures of ammonium sulfate and ammonium nitrate, Ammonium sulfate. Duty (MFN): free

## In other countries

No other national tariff on border.bot has live lines under 3102.21 yet.

- [The Harmonized System text for 3102.21](https://border.bot/hs-codes/310221)

- Previous subheading: [3102.10](https://border.bot/countries/united-states/hs-codes/310210) Mineral or chemical fertilizers, nitrogenous
- Next subheading: [3102.29](https://border.bot/countries/united-states/hs-codes/310229) Mineral or chemical fertilizers, nitrogenous

## Frequently asked questions

### How many national tariff lines does the United States tariff have under HS 3102.21?

The United States tariff splits HS 3102.21 (ammonium sulphate; double salts and mixtures of ammonium sulphate and ammonium nitrate: Ammonium sulphate) into 1 national line: 3102.21.00.00 (ammonium sulfate).

### What is the duty on HS 3102.21 in the United States?

Every United States line under 3102.21 is free of general (MFN) duty.

## Sources and updates

The tariff lines for the United States come from border.bot release 1 (edition 2026HTSRev21), read from the publisher’s files, and have been live since 9 October 2026.

The duty rates for the United States come from border.bot release 1 (edition 2026HTSRev21), read from the publisher’s files, and have been live since 9 October 2026.

The trade programmes for the United States come from border.bot release 1 (edition 2026HTSRev21), read from the publisher’s files, and have been live since 9 October 2026.

This page was last updated on 9 October 2026.

Guidance from published tariff data, not a binding ruling. For a decision customs must follow, apply to the destination’s customs authority for a binding tariff ruling.

Official source files:

- https://hts.usitc.gov/reststop/exportList?from=0000000000&to=9999999999&format=CSV&styles=false

Machine-readable: https://border.bot/countries/united-states/hs-codes/310221.json