# United States tariff line 2809.20.00.40: Polyphosphoric acids

> In the United States tariff, line 2809.20.00.40 covers phosphoric acid and polyphosphoric acids, polyphosphoric acids. Goods under this line enter free of general (MFN) duty. It falls under HS subheading 2809.20 in heading 28.09 (chapter 28).

Source: https://border.bot/countries/united-states/hs-codes/2809200040
Last updated: 9 October 2026

[Countries](https://border.bot/countries) / [United States](https://border.bot/countries/united-states) / [Chapter 28](https://border.bot/countries/united-states/hs-codes/28) / [2809.20](https://border.bot/countries/united-states/hs-codes/280920) / [2809.20.00.40](https://border.bot/countries/united-states/hs-codes/2809200040)

## Key facts

- Tariff line: 2809.20.00.40
- Covers: Phosphoric acid and polyphosphoric acids, polyphosphoric acids
- Duty (MFN): Free
- Additional duties: None recorded
- Restrictions: None recorded
- Tariff: [United States](https://border.bot/countries/united-states)
- HS subheading: [2809.20](https://border.bot/hs-codes/280920)

## What this line covers

In the United States tariff, line 2809.20.00.40 covers phosphoric acid and polyphosphoric acids, polyphosphoric acids.

Its legal text is “Polyphosphoric acids”, read under “Phosphoric acid and polyphosphoric acids”.

## How it is structured

It falls under HS subheading 2809.20 in heading 28.09 (chapter 28). The first six digits are the Harmonized System code; the 4 digits after them are added by the United States tariff.

- Chapter 28: Inorganic chemicals; organic or inorganic compounds of precious metals, of rare-earth metals, of radioactive elements or of isotopes
- Heading 28.09: Diphosphorus pentaoxide; phosphoric acid;polyphosphoric acids, whether or not chemically defined
- Subheading 2809.20: Phosphoric acid and polyphosphoric acids
- Line 2809.20.00.40: Polyphosphoric acids

## Duty

Goods under this line enter free of general (MFN) duty.

The rate is published on 2809.20.00.

## In other countries

No other national tariff on border.bot has live lines under 2809.20 yet.

- [The Harmonized System text for 2809.20](https://border.bot/hs-codes/280920)

## Other lines under 2809.20

- [2809.20.00.10](https://border.bot/countries/united-states/hs-codes/2809200010) Containing less than 65 percent available diphosphorus pentaoxide (P2O5) equivalents
- [2809.20.00.20](https://border.bot/countries/united-states/hs-codes/2809200020) Other
- [2809.20.00.30](https://border.bot/countries/united-states/hs-codes/2809200030) Other

- Previous line: [2809.20.00.30](https://border.bot/countries/united-states/hs-codes/2809200030) Other
- Next line: [2810.00.00.00](https://border.bot/countries/united-states/hs-codes/2810000000) Oxides of boron; boric acids

## Frequently asked questions

### What does tariff line 2809.20.00.40 cover in the United States tariff?

In the United States tariff, line 2809.20.00.40 covers phosphoric acid and polyphosphoric acids, polyphosphoric acids.

### What is the general (MFN) duty on 2809.20.00.40 in the United States?

Goods under this line enter free of general (MFN) duty. The rate is published on 2809.20.00.

## 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/2809200040.json