Singapore · UEN
Singapore UEN Checker
Check a Singapore Unique Entity Number (UEN) for correct format and check letter — and see whether it is also a GST registration number.
What is a Singapore UEN?
A Unique Entity Number (UEN) is the 9- or 10-character identifier that companies, businesses, LLPs, societies and other registered entities in Singapore use with government agencies, ending in a check letter — for example 200817984R for Google Asia Pacific Pte. Ltd. Many GST-registered businesses also use their UEN as their GST registration number.
Singapore UEN format (local company)
Year of registration, five digits and a check letter.
registration
Example: 200817984R (Google Asia Pacific Pte. Ltd.). Sometimes printed with hyphens, e.g. 20-0404750-D.
- Businesses: 8 digits + check letter, for businesses registered with ACRA (e.g. 12345678M).
- Other entities: T or S + 2-digit year + 2-character entity type + 4 digits + check letter, for LLPs, societies and others.
- Hyphens: Hyphens are not part of the UEN; the checker removes them.
- GST lookup: The number is looked up in the GST register. A UEN that is not GST-registered under the same number shows as not found, even if the company exists.
How to check a Singapore UEN
- 1 Find the UEN on the company’s invoice, contract or website footer.
- 2 Enter it above, with or without hyphens. The checker validates the format and check letter.
- 3 If a name comes back, the UEN is also a GST registration number. If not found, confirm the company in ACRA’s Bizfile.
- 4 Need the background on Singapore IDs? Read our Singapore tax ID guide.
Frequently Asked Questions
What is a UEN?
The Unique Entity Number is the standard identifier for entities registered in Singapore — companies, businesses, limited liability partnerships, societies and others — used in dealings with government agencies.
What are the UEN formats?
Businesses registered with ACRA use 8 digits and a check letter (e.g. 12345678M). Local companies use the year of registration, 5 digits and a check letter (e.g. 200817984R). Other entities use a T or S prefix with a year, an entity-type code, 4 digits and a check letter.
Is the UEN the same as the GST registration number?
Often. Most GST-registered businesses use their UEN as their GST registration number — Google Asia Pacific’s is 200817984R for both. Some, such as GST group members, use a separate number issued by IRAS. Check a GST registration number.
How do I check a UEN?
The checker on this page validates the format and check letter. The number is then looked up in the GST register, so a real UEN that is not GST-registered under the same number will show as not found — the company may still exist. ACRA’s Bizfile search confirms registration for ACRA-registered entities.
Is the UEN check letter officially published?
No. ACRA has not published the algorithm; it was released only on request. Live UENs pass the commonly used reconstruction, and the often-used sample 201012345A fails it. A valid check letter only shows the number is well-formed, not that the entity exists.
Where do I find a company’s UEN?
On its invoices, contracts or website — Singapore companies often print it in the footer — or by searching the company name in ACRA’s Bizfile.
Last reviewed: , against official sources.
Singapore business IDs compared
Every Singapore identifier Lookuptax validates.
| ID | Who has one | Format | Example |
|---|---|---|---|
| UEN (this page) | Companies, businesses, LLPs, societies and other entities | 9 or 10 characters ending in a check letter | 200817984R |
| GST registration number | GST-registered businesses (IRAS) | Usually the UEN; otherwise an IRAS number such as M2-1234567-K | 200817984R |
Validate tax IDs at scale
Check Singapore UENs and tax IDs from 100+ countries in one API call.