Singapore Unique Entity Number (UEN) Generator
Generate and format valid Singapore Unique Entity Number (UEN) for software testing and development.
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About Singapore Unique Entity Number (UEN)
The Unique Entity Number (UEN) is the official corporate identifier in Singapore (ACRA, ROS), adopted by IMDA and IRAS for the nationwide InvoiceNow e-invoicing network based on Peppol PINT SG specifications.
In the post-2009 modern entity format, UEN comprises 10 characters: 4-digit year, 2-letter entity type code (`LP`, `LL`, `FC`, `PF`), 3-digit sequence, and 1 Modulo 11 weighted check letter.
Anatomy & Structure of UEN — Singapore
The Singapore Unique Entity Number consists of 9 or 10 characters in 3 formats:
| Position | Field | Length | Meaning & Rule | Example |
|---|---|---|---|---|
| 1 to 4 | Incorporation Year | 4 digits | Year of incorporation for ACRA companies (Format A) | 2008 |
| 5 to 9 | Sequential / Entity Type | 5 digits/letters | Sequential corporate registration number | 12345 |
| 10 | Check Letter | 1 letter | Calculated via weighted Modulo 11 check algorithm by ACRA | M |
Official Algorithm (ACRA UEN Modulo 11)
Validation rules for Singapore UEN:
Structural validation (Formats A, B, C) + Weighted check letter calculation
- 1. Identify format: A (ACRA Companies), B (Sole Proprietors), or C (Other Entities).
- 2. Multiply characters by specific ACRA positional weights.
- 3. Map remainder to corresponding alphabetic check letter.