HS codes and classification for Singapore imports
The HS code assigned to your goods determines more than a statistic. It drives whether the goods are controlled, whether duty applies, and which agency has an interest. Getting it wrong is the root cause of a large share of held shipments.
At a glance
| System used | ASEAN Harmonised Tariff Nomenclature (AHTN), based on the international HS |
|---|---|
| Digits | Eight, in Singapore |
| First six digits | Internationally standardised |
| Determines | Control status, duty treatment, agency involvement, and statistics |
How the structure works
The Harmonised System is an international classification with six digits that are the same worldwide. ASEAN members extend it to eight digits for regional consistency, and that eight-digit AHTN code is what appears on a Singapore declaration. The first six digits mean the same thing in Rotterdam as in Singapore; the last two are regional. This is why a supplier's six-digit code is a useful starting point but not a complete answer.
Why it matters more than people expect
Classification is the hinge that the whole declaration turns on. The code determines whether the goods are in a controlled category and therefore need Competent Authority approval, whether they are in one of the four dutiable categories, whether preferential origin treatment could apply, and what documentation is expected. A wrong code does not simply produce a wrong statistic — it can mean an approval was never sought that should have been.
How classification is actually determined
Classification follows structured rules rather than intuition:
- What the product objectively is — its material, function, and state — governs, not its brand or marketing description.
- Where a product could fit two headings, the General Interpretative Rules resolve it, generally favouring the more specific description.
- Composite goods and sets have specific rules based on the component giving the article its essential character.
- Parts are often classified differently from the machines they belong to, and "parts of general use" have their own treatment.
When you are not sure
Guessing is the wrong response, and so is accepting a supplier's code without examining it — suppliers classify for export from their own country and sometimes for convenience. Singapore Customs operates a classification ruling process for importers who need certainty in advance, which is worth using for a product you will import repeatedly. For a one-off, working through it carefully with someone who has seen similar goods is usually sufficient.
Who carries the responsibility
The importer does. A Declaring Agent enters the code, and may advise on it, but the declaration is made on the importer's behalf and the responsibility for its accuracy sits there. This is one of several reasons it is worth understanding your own product classification rather than treating it as someone else's administrative detail.
Official sources
Requirements, rates, and thresholds change. These are the authorities that set them — check the current position with them before acting on anything here.
Last reviewed August 2026. This page explains how the process generally works; it is not advice on your specific shipment, and it does not replace guidance from Singapore Customs, the relevant Competent Authority, or a licensed Declaring Agent.
Questions we get asked about this
Can I just use the HS code my supplier gave me?
Use it as a starting point and check it. Suppliers classify for their own export requirements, sometimes casually, and the last two digits of a Singapore code are regional in any case. A code that is wrong in a way that misses a control requirement is an expensive inheritance.
What happens if the code is wrong?
It depends what the error causes. A classification error that changes the control status can mean goods held pending an approval that should have been obtained earlier. Errors affecting duty in the dutiable categories mean an underpayment to be corrected. Neither is a small administrative matter.
Can I get an official ruling on classification?
Singapore Customs provides a classification ruling process, which gives advance certainty. For a product you will import repeatedly, or where the classification is genuinely ambiguous and consequential, it is worth the effort.
Are parts classified with the machine?
Not automatically. Parts often have their own classification, and certain categories — fasteners, springs, general-use components — are classified by what they are rather than by what they go into. This trips up machinery importers regularly.
More in Singapore import guides
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Documentation checklist
Every document a Singapore import may need, and the point at which each has to exist.
Certificates of origin
What certificates of origin do, the two types, and when you actually need one.
Free trade agreements
The agreement network, and an honest account of what it does and does not do for importers.
Wood packaging (ISPM 15)
The treatment standard for wooden packing, and why it holds so many shipments.
Incoterms
What each term means for cost, risk, and your customs value.
Related pages
Controlled goods
Which agency regulates what, and how to find out whether your goods are affected.
Commercial invoice
What the invoice has to show, and the descriptions that get shipments held.
Customs duty
Why most imports are duty-free, and what happens with the four categories that are not.
Customs and import coordination
Help understanding what a shipment needs before it clears — permits, declarations, and the information a Declaring Agent will ask for.
TradeNet permit guidance
Plain-language guidance on the TradeNet permit process — what a UEN and Customs Account are for, and how a Declaring Agent fits in.
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