Leather HS Code: Wet Blue, Crust or Finished?
The same hide carries three different headings over its life, and the one that applies is the one that matches its condition on the day it leaves the tannery. Here is the decision, the definitions that drive it, and the finish threshold that moves leather out of Chapter 41 altogether.
A guide by TL San Martín, a tannery of origin in Elda (Alicante, Spain) since 1995, LWG Gold certified under the Leather Manufacturer standard.
The same hide has three HS headings over its life, and only its condition on shipping day decides which one applies. Wet blue and crust both sit in 4104 for bovine — split by wet or dry state. Once it is further prepared after tanning or crusting, it moves to 4107. Sheep runs 4105 → 4112, goat 4106 → 4113.
Why does the same hide have three different HS codes?
Because Chapter 41 is organised by how far the hide has been processed, not by what it will eventually become. A bovine hide that leaves a tannery as wet blue, comes back in as crust, and ships out again as finished upper leather has crossed two heading boundaries without ever changing animal, colour or thickness.
Two terms first, because the tariff uses them and most quotations do not explain them:
- Wet blue — hide that has been chrome-tanned but never dried. It is still wet, blue-grey, and has had no colour, no fatliquor and no surface finish applied.
- Crust — tanned leather that has been dried. It may already be retanned, dyed through and fatliquored, but it has no applied surface finish yet.
| State when it ships | Bovine / equine | Sheep / lamb | Goat / kid |
|---|---|---|---|
| Tanned, wet state (incl. wet blue) | 4104.11 / 4104.19 | 4105.10 | 4106.21 |
| Tanned, dry state (crust) | 4104.41 / 4104.49 | 4105.30 | 4106.22 |
| Further prepared after tanning or crusting (finished) | 4107 | 4112 | 4113 |
| Chamois, patent, patent laminated, metallised | 4114 | 4114 | 4114 |
The split inside 4104 is between wet and dry, not between tanned and dyed. The split between 4104 and 4107 is further preparation after tanning or crusting. Those are two different questions, and mixing them up is where most misdeclarations start.
What exactly counts as "crust"?
This is the definition that decides a large share of real shipments, and it is more generous than people expect. For headings 4104 to 4106, the term crust covers hides and skins that have been retanned, coloured or fat-liquored (stuffed) before drying.
Read that carefully: dyed leather is not automatically finished leather. A hide that has been retanned, dyed through in the drum and dried is still crust — it stays in 4104 even though it now looks like a finished colour. What moves it to 4107 is the further preparation after tanning or crusting: the applied surface work — pigment or aniline coats, lacquers, embossing, glazing, milling for a tumbled break, and the rest of the finishing route.
If your supplier invoices "dyed leather" and declares 4107, ask which of the two happened. If the colour is drum dye on a dried crust with nothing on the surface, the heading is 4104 and the duty line is not the same one. The vocabulary problem behind this — crust, finished, corrected, full grain — is unpacked in what the grades on a leather invoice mean.
When does a finish push leather out of Chapter 41 altogether?
Here is the threshold that almost no freight forwarder will quote you, because it is a specification your tannery controls, not a customs opinion. It concerns patent and coated leather, and the number is 0.15 millimetres.
Per the European Commission's own classification guidance:
| Coating on the leather | Where it classifies |
|---|---|
| Varnish, lacquer or preformed plastic sheet not more than 0.15 mm thick, mirror-like finish | Patent leather — 4114 |
| Preformed sheet thicker than 0.15 mm but less than half the total thickness | Patent laminated leather — 4114 |
| Preformed sheet thicker than 0.15 mm and more than half the total thickness | Chapter 39 — plastics. No longer leather for tariff purposes |
The same guidance also covers pigmented paint or lacquer that gives a metallic sheen — mica, silica or similar flakes in a binder — which classifies as imitation metallised leather in 4114.
The operational consequence is blunt: a coating-thickness figure from the finishing line decides whether your goods are leather or plastic at the border. That figure exists as a routine lab measurement in any tannery. It does not exist anywhere in a forwarder's file.
What do you put on the invoice so the heading holds?
Classification disputes are rarely won by argument; they are won by a commercial document that already contains the deciding facts. Five lines, all of which your tannery can state:
- Animal and tanning agent — bovine, goat, sheep; chrome, chrome-free, vegetable. Chapter 41 splits by animal before anything else, and the tanning route is also what your customer's compliance file will ask for.
- State on shipping date — wet state, dry crust, or finished. Not "as per order".
- Whether further preparation after tanning or crusting was applied, and which: pigment, aniline, lacquer, emboss, mill.
- Coating thickness in mm for any patent, laminated or metallised article.
- Measured area and the unit used — square feet or square metres, stated consistently. The conversion trap between the two is covered in leather price per square foot.
Sending a sample card ahead of the bulk shipment is a separate declaration with its own rules — proforma wording, valuation, and when the commercial-sample relief actually applies. That is set out in leather samples and customs HS code, and in German in Lederproben im Zoll.
Where does Chapter 41 end and the finished product begin?
Once the leather is cut and made up, it leaves Chapter 41 entirely:
- Bags, wallets, belts and small leather goods → Chapter 42, mostly heading 4202. The material of the outer surface sets the subheading, and the gap between a leather line and a coated-fabric line is real money — see leather goods HS codes in Chapter 42.
- Footwear → Chapter 64, where the upper material, not the sole, drives the heading: footwear HS codes explained.
- Export paperwork around both is in how to export leather goods, and if you are specifying uppers for the first time, start at the hub: leather for shoes.
A necessary disclaimer, and we will not pretend otherwise: we are a tannery, not a customs broker. Nothing here is a tariff ruling. Duty rates, subheading digits and any preferential treatment must be confirmed in the official source for your market — TARIC for the European Union, the UK Integrated Online Tariff on GOV.UK for the United Kingdom — and, where the amount at stake justifies it, fixed in advance with a Binding Tariff Information decision. What we can supply is the thing neither database contains: the material facts about your specific article, in writing, from the people who made it. That is also what a LWG certificate is and is not able to prove — worth reading before you attach one to a customs file.
Sourcing leather and want the classification facts in writing?
The TL San Martín open business board is free and public. Post what you need under Materials — an article for a specific collection, a certified batch, a sample run before bulk — and let suppliers answer with the spec, not just a price. If what you actually need is a production partner rather than a material, Partners & factories is the category for it. RFQ · Production covers everything with a deadline attached.
👉 Post on the open board — or request samples and we will send the technical data sheet with the fields above already filled in.
Frequently asked questions
Is wet blue leather classified under the same heading as crust?
For bovine and equine hides, yes — both sit in heading 4104. The split is at subheading level: 4104.11 and 4104.19 cover the wet state including wet blue, while 4104.41 and 4104.49 cover the dry state, which is crust. Same heading, different lines, different duty treatment.
Does dyed leather automatically classify as finished leather under 4107?
No. The Chapter 41 definition of crust explicitly includes hides retanned, coloured or fat-liquored before drying. Drum-dyed crust with no applied surface finish stays in 4104. What moves it to 4107 is further preparation after tanning or crusting — pigment or aniline coats, lacquer, embossing, glazing, milling.
When does coated leather stop being leather for customs purposes?
When a preformed plastic sheet is thicker than 0.15 mm and accounts for more than half the total thickness of the material, it classifies in Chapter 39 as plastics. Under 0.15 mm with a mirror finish it is patent leather in 4114; over 0.15 mm but under half the thickness, it is patent laminated leather, also 4114.
Who should decide the HS code, our tannery or our freight forwarder?
The importer of record is legally responsible for the declaration, and the forwarder files it. But the facts that determine the heading — animal, tanning agent, state of finish, coating thickness — originate in the tannery's technical data sheet. Ask for them in writing at quotation stage, and give them to your broker before the shipment moves.
TL San Martín tans and finishes leather in Elda, Alicante, since 1995: LWG Gold under the Leather Manufacturer standard — the only standard under which a Gold medal exists at all; a Trader tops out at “Approved”. Request samples before you specify anything.