Customs code · HS subheading 2931 59

Final code reached

Methylphosphonoyldifluoride (methylphosphonic acid difluoride)

This is a complete 8-digit customs code. Exports and Intrastat use it as it is. For an import into the EU the declaration uses 2931 59 10 00: this code with 00 added.

This code covers the specifically named compound methylphosphonoyldifluoride, also called methylphosphonic acid difluoride. It is listed among halogenated organic phosphorus compounds.

For example

Methylphosphonoyldifluoride (methylphosphonic acid difluoride)

See the official tariff text

Official tariff text

Methylphosphonoyl difluoride "methylphosphonic difluoride"

You are seeing what applies when you export from the EU. Switch above if you import.

You are seeing what applies when you import into the EU. Switch above if you export.

Your answer for export

The full EU export code is 2931 59 10.

You do not pick a 10-digit EU import line for an export declaration or Intrastat. The destination classifies the goods under its own tariff.

8 digits, ready

Selling to Norway, Great Britain and the United States

What they charge on arrival.

Norway, Great Britain and the United States use their own tariff lines under the 6-digit HS code. The rates below are what their customs charge on goods arriving from the EU. Match the goods against each country's own wording before you rely on a rate.

Norway

Duty free

Their lines4 Norwegian lines

29.31.5901 P-Alkyl (≤C10, incl. cycloalkyl) N-(1-(dialkyl (≤C10, incl. cycloalkyl) amino))alkylidene

Norwegian tariff data checked Sept. 13, 2026.

Great Britain

6.0%

Their lines1 British line
EU originDuty free

2931 59 10 00 Methylphosphonoyl difluoride (methylphosphonic difluoride)

Northern Ireland follows other rules.

UK tariff data checked Sept. 13, 2026.

United States

10.0%

Estimated from published US measures

Their lines8 US lines
Entry dateSept. 17, 2026

2931.59.00.10 Other organo-inorganic compounds, Halogenated organo-phosphorous derivatives

The US importer of record files the entry.

US tariff data checked Sept. 16, 2026.

See the 4 Norwegian lines

Selling to Norway

Norway splits the 6-digit category its own way, so these are Norway's own lines under it, not this EU code. Check your product against their wording; what Norwegian customs charges is shown per line.

29.31.5901

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

Ordinary duty

Duty free
29.31.5902

Methyl-(bis(diethylamino)methylene)phosphonamidofluoridate

Ordinary duty

Duty free
29.31.5903

Containing a phosphorus atom to which one methyl, ethyl, n-propyl or isopropyl group is bonded but no further carbon atoms

Ordinary duty

Duty free
29.31.5909

Other

Ordinary duty

Duty free

Norwegian tariff data version 1.5/1.2, last checked Sept. 13, 2026.

Contains data from Norwegian Customs (data.toll.no), licensed under CC BY 4.0, adapted for display.

See the 1 British line

Selling to Great Britain

What UK customs charges when goods like these arrive in Great Britain.

2931 59 10 00

Methylphosphonoyl difluoride (methylphosphonic difluoride)

Ordinary duty

6.0%

Goods of EU origin

Duty free You need documentation of EU preferential origin to use this rate.

These rates apply in Great Britain. Different rules may apply for goods entering Northern Ireland.

UK tariff data version v4.0.1599, last checked Sept. 13, 2026.

Contains public sector information licensed under the Open Government Licence v3.0.

Source: UK Department for Business and Trade (data.api.trade.gov.uk).

See the 8 US lines

Selling to the United States

What US customs charges when goods like these arrive from the EU. The US importer of record files the entry and pays the duty.

2931.59.00.10

Other organo-inorganic compounds, Halogenated organo-phosphorous derivatives, Other, O-Alkyl (≤ C10, including cycloalkyl) alkyl (methyl, ethyl,n- propyl or isopropyl) phosphonofluoridates

General rate

3.7%

From the EU

10.0% Estimated from published US measures US headings applied: 9903.05.39 Section 301 forced-labour action, 91 FR 47318 (memorandum 91 FR 47717), U.S. note 52 to subchapter III of chapter 99
2931.59.00.15

Other organo-inorganic compounds, Halogenated organo-phosphorous derivatives, Other, Alkyl (methyl, ethyl, n-propyl or isopropyl) phosphonyl difluorides

General rate

3.7%

From the EU

10.0% Estimated from published US measures US headings applied: 9903.05.39 Section 301 forced-labour action, 91 FR 47318 (memorandum 91 FR 47717), U.S. note 52 to subchapter III of chapter 99
2931.59.00.20

Other organo-inorganic compounds, Halogenated organo-phosphorous derivatives, Other, O-Isopropyl methylphosphonochloridate

General rate

3.7%

From the EU

10.0% Estimated from published US measures US headings applied: 9903.05.39 Section 301 forced-labour action, 91 FR 47318 (memorandum 91 FR 47717), U.S. note 52 to subchapter III of chapter 99
2931.59.00.25

Other organo-inorganic compounds, Halogenated organo-phosphorous derivatives, Other, O-Pinacolyl methylphosphonochloridate

General rate

3.7%

From the EU

10.0% Estimated from published US measures US headings applied: 9903.05.39 Section 301 forced-labour action, 91 FR 47318 (memorandum 91 FR 47717), U.S. note 52 to subchapter III of chapter 99
2931.59.00.30

Other organo-inorganic compounds, 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

General rate

3.7%

From the EU

10.0% Estimated from published US measures US headings applied: 9903.05.39 Section 301 forced-labour action, 91 FR 47318 (memorandum 91 FR 47717), U.S. note 52 to subchapter III of chapter 99
2931.59.00.35

Other organo-inorganic compounds, Halogenated organo-phosphorous derivatives, Other, Methyl- bis(diethylamino)methylene)phosphonamidofluoridate

General rate

3.7%

From the EU

10.0% Estimated from published US measures US headings applied: 9903.05.39 Section 301 forced-labour action, 91 FR 47318 (memorandum 91 FR 47717), U.S. note 52 to subchapter III of chapter 99
2931.59.00.60

Other organo-inorganic compounds, 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

General rate

3.7%

From the EU

10.0% Estimated from published US measures US headings applied: 9903.05.39 Section 301 forced-labour action, 91 FR 47318 (memorandum 91 FR 47717), U.S. note 52 to subchapter III of chapter 99
2931.59.00.80

Other organo-inorganic compounds, Halogenated organo-phosphorous derivatives, Other

General rate

3.7%

From the EU

10.0% Estimated from published US measures US headings applied: 9903.05.39 Section 301 forced-labour action, 91 FR 47318 (memorandum 91 FR 47717), U.S. note 52 to subchapter III of chapter 99

Worked out for an entry on Sept. 17, 2026.

US tariff schedule 2026HTSRev19, last checked Sept. 16, 2026.

Last change we recorded: Revision 19 (2026), Sept. 16, 2026.

Anti-dumping and countervailing duties, US import taxes and customs fees are not included.

The descriptions above are the US tariff texts, which the United States publishes in English only.

Source: the US International Trade Commission's Harmonized Tariff Schedule (hts.usitc.gov), public domain, and the measures published in the Federal Register.

This is a planning estimate from the US Harmonized Tariff Schedule (revision shown) and the published Federal Register measures as of the date shown, for a shipment of EU origin. It is not a customs entry, legal advice or a broker's opinion, and tariffs.help is not a US-licensed customs broker. The US importer of record or their broker confirms the classification, origin, value and the duty due before filing.

Before you use the code

Check the facts that sit outside the code

The code can be right while what you pay still changes, because of where the goods come from, when they arrive, or extra EU measures.

Classify your own product, free Look up the current rates and rules

The product and its form Check that your product really matches this description, including what it is made of and the form it arrives in.
Country of origin Trade agreements, sanctions and extra measures can change the treatment of the very same code.
Current tariff measures Check today's rate, any restrictions or licences, and the quantity customs asks for, with Toldstyrelsen or TARIC.

What to do now for an import

The code is settled. What is left is the import declaration around it.

On an import declaration the code is 2931 59 10 00: this code with 00 added There is no further split under it. Go to this section
State the country of origin: it decides the rate, sanctions and documents The same code can be charged and treated differently depending on where the goods were made.
Check today's requirements in TARIC Rates, quotas and document requirements change. The EU's own database is the current source. Open the EU TARIC database

Check it before you file This is a suggestion, please verify it against your own product.

On an import declaration

2931 59 10 00

When these goods are imported into the EU, the declaration uses the 10-digit form 2931591000: this code with 00 added. There is no further split under it.

Look this line up in the EU tariff

Exports from the EU and Intrastat normally use the 8-digit code as it is.

EU tariff data of Sept. 13, 2026.

Rates, origin and documents

Read the signals first. Open only the ones you want to check.

Besides the ordinary duty, the EU records these kinds of measure against this code. They are listed as signals only: whether one applies to your goods can depend on where they come from, who produced them, the exact product and the documents you present. No amounts are worked out here.

Data of Sept. 1, 2026

Lower duty for goods from some countries

Possible

Preferential rates exist for goods originating in:

San Marino
Comoros (excluding Mayotte), Madagascar, Mauritius, Seychelles and dependencies and Zimbabwe
Botswana, Eswatini, Lesotho, Mozambique and Namibia
Ivory Coast
Cameroon
Fiji
United Kingdom
Georgia
+46 origins

These rates apply to Economic Partnership Agreements; CARIFORUM except Haiti; GSP-EBA (Special arrangement for the least-developed countries - Everything But Arms); OCTs (Overseas Countries and Territories); GSP - General arrangements except India; GSP+ (incentive arrangement for sustainable development and good governance).

Whether you can use one depends on the origin rules for the goods and on the documentation you can show.

Check this code in the official EU TARIC database

Restrictions and paperwork

Important

Import restrictions are recorded for goods originating in:

Ukraine
Belarus
Russian Federation

The EU records document conditions on this code. What customs may ask for depends on where the goods come from, exactly what the product is and the customs procedure.

Proof of origin 2 conditions

If you claim a lower rate for goods from a country the EU has a trade agreement with, customs asks for proof of origin, for example a EUR.1 certificate or an origin declaration.

Show the EU's own wording for these conditions

Movement certificate EUR.1
Invoice declaration or origin declaration made out by any exporter on invoice or any other commercial document

Sanctions and restricted regions 13 conditions

Some conditions come from EU sanctions rules. They matter when the goods are linked to a country or region the EU restricts trade with.

Show the EU's own wording for these conditions

Goods not originating from or destined to Crimea or Sevastopol (Articles 2 and 2b.1 of Council Regulation (EU) No 692/2014)
Goods not originating from or not destined for the non-government controlled areas of Ukraine in the oblasts of Donetsk, Kherson, Luhansk and Zaporizhzhia
The prohibitions defined in article 1ra paragraph 1 of Council Regulation (EU) No 765/2006 do not apply (see exemptions in article 1ra paragraph 4)
The prohibitions defined in article 1ra paragraph 1 of Council Regulation (EU) No 765/2006 do not apply (see exemptions in article 1ra paragraph 3)
Goods entered the territory of the customs union of the EU and presented to customs authorities prior to the entry into force or to applicability date of the present sanction, whichever is latest (see Article 8f of Regulation (EU) No 765/2006)
Import authorisation by virtue of article 1ra paragraph 10 of Council Regulation (EU) 765/2006
The prohibitions defined in article 3i.1 of Council Regulation (EU) No 833/2014 do not apply (see exemptions in article 3i.3aa)
Import authorisation by virtue of article 12b.2 of Council Regulation (EU) 833/2014
Goods entered the territory of the customs union of the EU and presented to customs authorities prior to the entry into force or to applicability date of the present sanction, whichever is latest (see Article 12e of Regulation (EU) No 833/2014)
Import authorisation by virtue of article 3i paragraph 3c of Council Regulation (EU) 833/2014
The prohibitions defined in article 1aa.1 of Council Regulation (EC) No 765/2006 do not apply (see exemptions in article 1aa.2a)
The prohibitions defined in article 1aa paragraph 1 of Council Regulation (EC) No 765/2006 do not apply (see contractual exemptions in article 1aa paragraph 2b)
The prohibitions defined in article 4 paragraph 1 of Council Regulation (EU) No 833/2014 do not apply (see exemptions in article 4 paragraph 2)

Statements that the goods are outside a rule's scope 1 condition

Some conditions are statements that a rule does not cover the goods, for example that the product is not on a controlled list.

Show the EU's own wording for this condition

Goods other than those described in the Common Military List of the European Union

Check this code in the official EU TARIC database

EU tariff measure data of Sept. 1, 2026.

One last classification check

Check the path and the nearest alternatives.

Use this view if you are still unsure the code describes the product precisely.

How we got to this code

VI
29
2931
2931 59
2931 59 10

Show the steps

The path to this code

Every level is settled. Open an earlier step if you need to change a choice.

Step 5 of 5 · Complete

Step 1 · Section VI Products of the chemical or allied industries
Is it an inorganic or organic chemical; a pharmaceutical product; a fertilizer; a tanning or dye extract, pigment, paint, varnish, filler or printing ink; an essential oil, perfume, cosmetic or toilet product; soap, a surface-active, washing, cleaning, polishing or wax product; a protein, modified starch, glue or enzyme; an explosive, pyrotechnic article, match or other specified combustible material; a photographic or cinematographic product; or another chemical product?
✓
Step 2 · Chapter 29 Organic chemicals 2 of 11 chapters in section VI
What type of organic chemical is it—for example, a hydrocarbon, alcohol, acid, nitrogen compound, sulfur compound, heterocyclic compound, vitamin, hormone, glycoside, plant alkaloid, sugar, antibiotic or another listed organic compound?
✓
Step 3 · Heading 2931 Separate chemically defined organo-inorganic compou… 31 of 42 headings under chapter 29
Is it tetramethyllead or tetraethyllead; a tributyltin compound; one of the specifically named phosphorus compounds; a derivative of a non-halogenated or halogenated organic phosphorus compound; or another organic–inorganic compound not specified elsewhere?
✓
Step 4 · Subheading 2931 59 Separate chemically defined halogenated organo-phos… 16 of 17 subheadings under heading 2931
Is it methylphosphonoyldifluoride (methylphosphonic acid difluoride), or another derivative of a halogenated organic phosphorus compound?
✓
Step 5 · Full code 2931 59 10 Methylphosphonoyl difluoride "methylphosphonic difl… 1 of 2 codes under subheading 2931 59

Compare with the codes next to it.

Compare the sibling codes at this level before you settle on this one.

you are here 2931 59 10 Methylphosphonoyl difluoride "methylphosphonic difluoride" 6.5%
another option 2931 59 90 Separate chemically defined halogenated organo-phosphorous derivatives, n.e.s. No rate on file

Worth comparing

Codes that sit close to this one, for when the material itself could be different.

Browse chapter 29

Often confused with

2811 11 00 Hydrogen fluoride "hydrofluoric acid" 5.5%
That code names hydrogen fluoride, while this code names methylphosphonoyldifluoride.
2931 59 90 Separate chemically defined halogenated organo-phosphorous derivatives, n.e.s. No rate on file
That code covers other halogenated organic phosphorus derivatives not specifically named here, while this code names methylphosphonoyldifluoride.
2942 00 00 Separate chemically defined organic compounds, n.e.s. 6.5%
That code covers other isolated, chemically defined organic compounds, while this code specifically names methylphosphonoyldifluoride.

Duty rates shown here are estimates, read from official EU / Danish, Norwegian and UK tariff data for orientation only. Confirm the current rate with Toldstyrelsen, TARIC, Norwegian Customs or the UK Online Trade Tariff before you file. The rate you pay can also depend on the country of origin. These are base customs duties only: import VAT, excise duties, anti-dumping duties and safeguard or quota measures are not included.