# United States tariff lines under HS 2931.59

> The United States tariff splits HS 2931.59 (halogenated organo-phosphorous derivatives: Other) into 8 national lines: 2931.59.00.10 (O-Alkyl (≤ C10, including cycloalkyl) alkyl (methyl, ethyl,n- propyl or isopropyl) phosphonofluoridates), 2931.59.00.15 (alkyl (methyl, ethyl, n-propyl or isopropyl) phosphonyl difluorides), 2931.59.00.20 (O-Isopropyl methylphosphonochloridate), 2931.59.00.25 (O-Pinacolyl methylphosphonochloridate) and 4 others. The general (MFN) duty is 3.7% on all 8 lines.

Source: https://border.bot/countries/united-states/hs-codes/293159
Last updated: 9 October 2026

[Countries](https://border.bot/countries) / [United States](https://border.bot/countries/united-states) / [Chapter 29](https://border.bot/countries/united-states/hs-codes/29) / [2931.59](https://border.bot/countries/united-states/hs-codes/293159)

## Key facts

- HS subheading: [2931.59](https://border.bot/hs-codes/293159)
- Duty (MFN): 3.7%
- National lines: 8
- Tariff: [United States](https://border.bot/countries/united-states)
- Chapter: 29: Organic chemicals

## United States lines under 2931.59

The United States tariff splits HS 2931.59 (halogenated organo-phosphorous derivatives: Other) into 8 national lines: 2931.59.00.10 (O-Alkyl (≤ C10, including cycloalkyl) alkyl (methyl, ethyl,n- propyl or isopropyl) phosphonofluoridates), 2931.59.00.15 (alkyl (methyl, ethyl, n-propyl or isopropyl) phosphonyl difluorides), 2931.59.00.20 (O-Isopropyl methylphosphonochloridate), 2931.59.00.25 (O-Pinacolyl methylphosphonochloridate) and 4 others.

The general (MFN) duty is 3.7% on all 8 lines.

- [2931.59.00.10](https://border.bot/countries/united-states/hs-codes/2931590010) Halogenated organo-phosphorous derivatives, Other, O-Alkyl (≤ C10, including cycloalkyl) alkyl (methyl, ethyl,n- propyl or isopropyl) phosphonofluoridates. Duty (MFN): 3.7%
- [2931.59.00.15](https://border.bot/countries/united-states/hs-codes/2931590015) Halogenated organo-phosphorous derivatives, Other, Alkyl (methyl, ethyl, n-propyl or isopropyl) phosphonyl difluorides. Duty (MFN): 3.7%
- [2931.59.00.20](https://border.bot/countries/united-states/hs-codes/2931590020) Halogenated organo-phosphorous derivatives, Other, O-Isopropyl methylphosphonochloridate. Duty (MFN): 3.7%
- [2931.59.00.25](https://border.bot/countries/united-states/hs-codes/2931590025) Halogenated organo-phosphorous derivatives, Other, O-Pinacolyl methylphosphonochloridate. Duty (MFN): 3.7%
- [2931.59.00.30](https://border.bot/countries/united-states/hs-codes/2931590030) Halogenated organo-phosphorous derivatives, Other, P-Alkyl (≤ C10, incl. cycloalkyl) N-(1-(dialkyl (≤ C10, incl. cycloalkyl) amino))alkylidene (H or ≤C10, incl. cycloalkyl) phosphonamidic fluorides and corresponding alkylated or protonated salts. Duty (MFN): 3.7%
- [2931.59.00.35](https://border.bot/countries/united-states/hs-codes/2931590035) Halogenated organo-phosphorous derivatives, Other, Methyl- bis(diethylamino)methylene)phosphonamidofluoridate. Duty (MFN): 3.7%
- [2931.59.00.60](https://border.bot/countries/united-states/hs-codes/2931590060) Halogenated organo-phosphorous derivatives, Other, Containing a phosphorus atom to which one methyl, ethyl, n-propyl or isopropyl group is bonded but no further carbon atoms. Duty (MFN): 3.7%
- [2931.59.00.80](https://border.bot/countries/united-states/hs-codes/2931590080) Halogenated organo-phosphorous derivatives, Other, Other. Duty (MFN): 3.7%

## In other countries

No other national tariff on border.bot has live lines under 2931.59 yet.

- [The Harmonized System text for 2931.59](https://border.bot/hs-codes/293159)

- Previous subheading: [2931.54](https://border.bot/countries/united-states/hs-codes/293154) Other organo-inorganic compounds
- Next subheading: [2931.90](https://border.bot/countries/united-states/hs-codes/293190) Other

## Frequently asked questions

### How many national tariff lines does the United States tariff have under HS 2931.59?

The United States tariff splits HS 2931.59 (halogenated organo-phosphorous derivatives: Other) into 8 national lines: 2931.59.00.10 (O-Alkyl (≤ C10, including cycloalkyl) alkyl (methyl, ethyl,n- propyl or isopropyl) phosphonofluoridates), 2931.59.00.15 (alkyl (methyl, ethyl, n-propyl or isopropyl) phosphonyl difluorides), 2931.59.00.20 (O-Isopropyl methylphosphonochloridate), 2931.59.00.25 (O-Pinacolyl methylphosphonochloridate) and 4 others.

### What is the duty on HS 2931.59 in the United States?

The general (MFN) duty is 3.7% on all 8 lines.

## 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/293159.json