# HTS 2809: Diphosphorus pentaoxide; phosphoric acid;polyphosphoric acids, whether or not chemically defined:

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Source: [2026 HTS Revision 21 (October 9, 2026)](https://hts.usitc.gov/search?query=2809). Additional duties by country of origin may apply; estimate a shipment's full duty with the tariff calculator: https://geopax.app/tariffs/calculator

## 2809: Diphosphorus pentaoxide; phosphoric acid;polyphosphoric acids, whether or not chemically defined:

| Code | Description | General | Special | Column 2 | Units |
| --- | --- | --- | --- | --- | --- |
| 2809 | Diphosphorus pentaoxide; phosphoric acid;polyphosphoric acids, whether or not chemically defined: |  |  |  |  |
| 2809.10.00.00 |   Diphosphorus pentaoxide | Free |  | 25% | kg |
| 2809.20.00 |   Phosphoric acid and polyphosphoric acids | Free |  | Free |  |
|  |     Phosphoric acid: | Free |  | Free |  |
|  |       Fertilizer grade: | Free |  | Free |  |
| 2809.20.00.10 |         Containing less than 65 percent available diphosphorus pentaoxide (P2O5) equivalents | Free |  | Free | t |
| 2809.20.00.20 |         Other | Free |  | Free | t |
| 2809.20.00.30 |       Other | Free |  | Free | t |
| 2809.20.00.40 |     Polyphosphoric acids | Free |  | Free | t |