Tandom · Duty calculator
HTS 3105.40.00.10 is the U.S. Harmonized Tariff Schedule classification for Ammonium dihydrogenorthophosphate (Monoammonium phosphate). It's a 10-digit statistical line in Chapter 31: Fertilizers, Section VI: Products of the Chemical or Allied Industries, used by U.S. Customs and Border Protection to determine the duty rate at entry. 2 active AD/CVD orders flag this code.
New to HTS codes? Read our guide on how HTS classification works →
Active orders that may apply to imports under this HTS code. HTS coverage is advisory — actual scope depends on each order's product description. Run the AD/CVD lookup → to check whether your specific shipment is in scope.
Past CBP decisions classifying real products under this HTS code. Useful precedent when classifying a similar product — each ruling shows how CBP interpreted the code for a specific case.
Source: CBP CROSS (view all rulings on rulings.cbp.gov →)
HTS 3105.40.00.10 is the U.S. Harmonized Tariff Schedule classification for Ammonium dihydrogenorthophosphate (Monoammonium phosphate). It belongs to Chapter 31 of the HTSUS.
The general (Column 1) duty rate for HTS 3105.40.00.10 is Free. This is the most-favored-nation (MFN) rate that applies to imports from World Trade Organization member countries.
No active Chapter 99 tariff overlays (Section 301, Section 232, IEEPA reciprocal, etc.) currently flag HTS 3105.40.00.10 in Tandom's catalog. Use the calculator's date + origin inputs to confirm against any retroactive overlay you may be filing.
Yes — 2 AD/CVD orders flag this code: C-821-825 (CVD, Russia), C-714-001 (CVD, Morocco). Open the code page for deposit rates, scope determinations, and the linked case lookups.
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