What are the three UEN formats?

Businesses registered before 2009 use 8 digits plus a check letter (e.g. 52912345A). Local companies use 9 digits plus a check letter (e.g. 201312345K). Other entities use a 'T' or 'S' or 'R' century prefix, a 2-digit year, a 2-letter entity type, a 5-digit sequence and a check letter (e.g. T08LL0001B).

Does this confirm the entity is registered?

No. This validator only checks that the UEN is well-formed against ACRA's published structure. To confirm a live registration, search the official ACRA BizFile directory. This tool performs no lookup.

How long is a Singapore UEN?

A UEN is 9 or 10 characters. Business UENs are 9 characters (8 digits + letter), local companies are 10 characters (9 digits + letter), and other entities are 10 characters (prefix + year + entity code + sequence + letter).

Why does my UEN fail validation?

The most common causes are a missing or wrong final check letter, an incorrect length, or using digits where letters are expected in the 'Other' entity-type segment. Re-check each character against the issued document.

Is my UEN sent anywhere?

No. All validation runs locally in your browser. The UEN never leaves your device, so it is safe to paste sensitive identifiers.

Singapore UEN Validator

A Unique Entity Number (UEN) is the standard identifier the Singapore government issues to every registered entity — businesses, local companies, and other organisations such as societies and statutory bodies. You need a correctly-formed UEN for ACRA filings, GST invoicing, and CorpPass access. This free validator checks the structure of all three UEN formats in your browser.

How it works

ACRA defines three UEN structures, and the validator first works out which one applies, then checks each segment:

Business (9 chars): nnnnnnnnC — 8 digits followed by a single check letter. Used by sole proprietors and partnerships registered before 2009.
Local Company (10 chars): yyyynnnnnC — a 4-digit year of issue, a running 5-digit number, and a check letter. The leading 4 digits are the registration year (1900–current).
Other entities (10 chars): Tyyptnnnnnc style — a century prefix (T = 2000s, S = 1900s, R = 1800s/pre), a 2-digit year, a 2-letter entity-type code (e.g. LL, PF, CC), a 5-digit sequence, and a final check letter.

The tool validates the length, the positions that must be digits, the positions that must be letters, and the allowed prefix set. The final character must always be an uppercase letter (A–Z).

Example

Validate T08LL0001B:

Prefix T → year 2000s, valid.
Year 08 → two digits, valid.
Entity code LL → two letters (limited liability partnership), valid.
Sequence 0001 then check letter B → the last char is a letter, the five before it are digits.

This is a well-formed Other entity UEN. Note that a structural pass does not prove the entity is currently active — use ACRA BizFile for that. All processing here is local; nothing leaves your device.