What Is a Singapore UEN?
A Unique Entity Number (UEN) is the standard identification number assigned to entities registered in Singapore. Introduced in 2009 to replace multiple identification systems, the UEN serves as a single identifier used across all government agencies.
Every Singapore company, sole proprietorship, limited liability partnership, and other business entities must have a UEN. It appears on your ACRA BizFile profile, tax filings, and official documents.
UEN Format Explained
Different entity types have different UEN formats:
| Entity Type | Format | Example |
|---|---|---|
| Local Company (Pte Ltd) | YYYYNNNNNX | 202600032K |
| Sole Proprietorship | 5NNNNNNNNX | 53123456A |
| Limited Liability Partnership | TYYXXNNNNX | T08LL1234A |
YYYY = Year of registration (e.g., 2026)
NNNNN = 5-digit sequence number
X = Check letter (calculated by ACRA)
The Check Letter
The final character in a UEN is a check letter calculated using an algorithm defined by ACRA. This check digit helps detect typos and ensures the UEN you enter is structurally valid. Our validator automatically verifies this check letter.
Our validator checks both the format and the check letter. A UEN that passes validation is structurally correct, but may not be registered. Always verify important UENs on the official ACRA BizFile portal.
When to Validate a UEN
Validating a UEN is useful in several scenarios:
Before entering contracts, verify your counterparty's UEN is valid and matches their claimed company name
Check that UENs on invoices are correctly formatted before processing payments
Catch typos when entering UENs into your systems
Find a company's SSIC code, registration date, and status from their UEN