What is the Unique Entity Number (UEN) in Singapore: Complete Guide for Businesses

Key Takeaways

• A UEN is an entity’s Singapore registration identifier. A standard number is issued on registration without a separate UEN fee.
• Search Bizfile by legal name or UEN, then check the entity’s status and details.
• Local companies must display their registration number on specified business documents and keep their registered particulars up to date. Relevant company-detail changes generally need to be filed within 14 days.
• A UEN normally stays with the same entity through name changes, but creating or restructuring a business needs a separate check. Registration exemptions and foreign-company branches also require attention to the relevant rules.

If you need to find a UEN, search the business name on Bizfile. If you already have a number, search that number to check which entity it belongs to.

This guide explains UEN registration, search, formats, and everyday uses, including the rules for displaying your number and keeping business records up to date.

What is a Unique Entity Number in Singapore?

A UEN identifies a registered entity across government services. It is also commonly called a business registration number. The number helps distinguish organisations with similar names and gives customers and suppliers a consistent reference for their records.

Who Needs a UEN in Singapore?

Registered companies, sole proprietorships, partnerships, limited partnerships and LLPs use UENs. The system also covers registered societies, trade unions and other organisations registered through the relevant issuance agency.

Which Agencies Issue UENs?

A corporate service provider like InCorp can assist with the application but does not issue the number itself. Examples from the official Corppass agency directory are below.

Common UEN Formats and Examples

A UEN contains letters and numbers. Describing it as “9 or 10 digits” can mislead readers; “9 or 10 characters” is more accurate for the common formats below.

How to Read the Letters and Numbers

In the LLP example T18LL7777F, T18 is the year-related prefix, LL identifies the entity category, 7777 is the numeric component and F is the check letter. The prefix and suffix of a Special UEN are system-generated. You cannot customise the whole identifier.

Other categories use different codes. For example, ACRA’s public dataset includes society identifiers containing SS and trade-union identifiers containing TU. Historical prefixes vary, so do not use one example as a universal validation rule.

How to Apply for a UEN in Singapore

A standard UEN comes with successful entity registration. You do not apply for the number first and then use it to create the business. For local businesses and companies, complete the relevant ACRA registration through Bizfile.

Choose Your Business Structure

Decide whether you need a sole proprietorship, partnership, LLP or company. The choice affects liability, administration and filing requirements. InCorp’s Singapore incorporation consultants can help assess the appropriate structure.

Reserve a Name and Submit the Bizfile Application

Prepare your proposed name, SSIC business activities, address, and required owner or position-holder details. Reserve the name and complete the registration transaction for your chosen structure. The exact requirements vary by entity type. For the full company setup process, see our guide to registering a company in Singapore.

Receive the UEN After Registration is Approved

Record the UEN from your registration confirmation and Business Profile. Keep it with the legal name and registered address so banks, accountants and service providers use consistent information. The standard number is included; choosing a SUN is optional and costs extra.

UENs for Foreign Companies and Partnerships

A foreign-owned Singapore subsidiary is registered as a local company. An overseas company establishing a Singapore branch follows ACRA’s foreign-company registration route. ACRA also lists foreign companies among the entities for which it issues UENs. Eligible representative offices follow a different route, with Enterprise Singapore or the relevant sector regulator.

Foreign founders registering a Singapore partnership or LLP should follow that structure’s ACRA requirements, including applicable local-resident roles.

ACRA directs foreigners to engage a corporate service provider for name reservation and registration. Foreign ownership does not automatically make every entity eligible for Enterprise Singapore registration.

Can You Choose a Special UEN?

A Special UEN (SUN) is an optional memorable number chosen from ACRA’s available list. It makes for easier recall; it does not change the entity’s regulatory obligations.

How to Select a SUN

The option appears at the payment stage when registering a new entity. Choose from the available numbers and pay the additional fee. The prefix and check-letter suffix remain system-generated. An existing registered business cannot simply swap its number for a SUN.

Special UEN Pricing Tiers

These charges are additional to registration fees. SUN purchases are non-refundable and non-exchangeable. Check the options available in Bizfile rather than assuming a preferred sequence is reserved for you.

How to Find and Check a UEN in Singapore

Use the current Bizfile entity search rather than relying on an old directory screenshot or a number copied from an invoice.

Step 1: Open Bizfile Entity Search

Go to Bizfile and find “Search for business information”. Select the Entity tab and enter the legal business name or UEN.

Step 2: Choose the Matching Search Filters

For a number search, select “UEN (including previous UEN)” under Keyword match type. For a name search, use an exact, starting-with, or containing-name match. Check the Issuance agency filter, especially for a non-ACRA entity, then select Search.

Step 3: Check the Matching Entity Record

Open “More information” for the matching result. Compare its legal name, UEN, status, and registered address with the details supplied to you.

If several names look similar, ask the supplier for its full legal name and UEN rather than guessing. If a number returns no match, check transcription errors first, then confirm the issuing agency. An unsuccessful search is a reason to investigate, not automatic proof of fraud.

How to Verify the Entity Status

Read the status shown in the official search result and match the entity type, address, and legal name to the documents you received. A correctly formatted number can still refer to a different entity or an entity whose status has changed. Where a record suggests closure or a pending process, investigate before contracting or paying.

Where to Find Your Own UEN

Check your registration confirmation or Business Profile, or search your legal business name on Bizfile. An old invoice can help you locate a number, but use the official record to check its current details.

A Practical Supplier Verification Checklist

Before adding a supplier to your accounting system, reconcile three records: its official entity details, the invoice, and the intended payment recipient. If GST appears on the invoice, verify that claim separately with IRAS. A UEN search does not establish GST registration.

For example, a trading name on a quotation may differ from the legal company name. Ask the supplier to explain the relationship and issue the invoice under the correct entity.

Keep a dated record of the checks with your supplier onboarding documents. This easily identifies changes to names, tax details, or payment instructions later.

How to Use Your UEN and Why it Helps

A common identifier reduces confusion when different services refer to the same entity. It also makes it easier for a customer to match your invoice to an official record. Having a UEN does not automatically activate every service or guarantee eligibility for a grant or licence.

Government Transactions and Business Services

Use your UEN when identifying the entity for government services, tax administration and relevant licence or permit applications. Corppass manages access for people authorised to act for the organisation; simply knowing its UEN does not grant access.

Import and Export Permits

A business that needs customs services must activate its Customs Account using its UEN before undertaking the relevant Customs activities. UEN issuance and Customs activation are separate steps. Check Singapore Customs’ guidance before arranging your first shipment.

UEN and Other Business Identifiers

Use the field requested by the form or system. Do not substitute a UEN for an SSIC code, or assume that having a UEN completes InvoiceNow onboarding. ACRA uses SSIC codes in name applications; IRAS separately instructs businesses to obtain a Peppol ID through their solution or access-point provider.

Is a UEN the Same as a GST Number?

The two serve different purposes, but their characters can be identical. IRAS explicitly provides invoice examples for businesses whose UEN and GST registration number are the same, and for those whose numbers differ. It is therefore inaccurate to say they must always be different.

Having a UEN does not automatically register a business for GST. Our Singapore GST guide explains compulsory and voluntary registration. Use the GST registration number confirmed by IRAS on the relevant tax documents. For a supplier check, verify GST status separately instead of assuming that an ACRA record authorises the business to charge GST.

UEN and InvoiceNow in 2026

InvoiceNow carries structured electronic invoices over the Peppol network. Your UEN is used when your provider registers your business in the Singapore Peppol Directory and obtains a Peppol ID. Sending a PDF by email alone is not the same onboarding process.

From 1 April 2026, businesses applying for voluntary GST registration fall within the GST InvoiceNow requirement regardless of incorporation date or structure, subject to the exclusions published by IRAS.

These include overseas entities and businesses registered because of the reverse-charge regime. Other groups follow later implementation phases. See our GST InvoiceNow requirements guide for more on the rollout and preparation.

If your business is in scope, confirm that your accounting solution supports InvoiceNow, arrange registration with your provider and activate the GST invoice-data submission feature. Keep the UEN consistent with your registration records. This is a practical setup task for your finance team, not a reason to apply for another UEN.

Where Must You Display the UEN?

For local companies, ACRA says that the registration number must appear clearly on business letters, statements of account, invoices, official notices and publications. These requirements sit under section 144 of the Companies Act.

Business Documents and Correspondence

Add the legal company name and UEN to the templates used for invoices, account statements and business correspondence. Check the rules for your actual structure: the statutory requirements for a company should not be presented as identical rules for every type of organisation.

Websites and Electronic Documents

As a practical consistency measure, display the legal entity name and UEN in your website footer and business email signature, and include them in electronic invoice templates. This helps customers verify the entity behind a trading name. The exact legal treatment of particular materials depends on the applicable provisions; avoid assuming a universal QR-code display requirement.

If you issue GST tax invoices, also follow IRAS’s invoice-content requirements. The GST registration number has a separate tax purpose even when its characters match the UEN.

How to Update the Information Linked to Your UEN

Keep the registered entity’s particulars current when its address, business activity, or officers change. For local companies, ACRA generally requires relevant changes to company details and position holders to be filed within 14 days. Particular transactions have their own requirements.

Updating Company Details in Bizfile

Use the relevant entity-information or position-holder transaction in Bizfile. A company-name change requires the appropriate resolution and filing steps. After the official record is updated, amend your bank, invoicing, and customer records to prevent mismatches. Other entity types should follow their own issuance agency’s procedures.

UEN Exemptions and Special Cases

UEN eligibility and business-registration exemptions are related but different questions. Start by checking whether the activity or entity needs registration, then confirm the identifier used by the relevant agency.

Individuals and Businesses Exempt From Registration

Individuals use personal identification for personal transactions. ACRA lists exemptions for businesses using only the owner’s full NRIC name or all partners’ full NRIC names. These exceptions mean that the absence of a business UEN should not automatically be described as unlawful trading. Other obligations can still apply.

Overseas Entities and Occasional Transactions

An overseas business should confirm the registration and identification requirements for its proposed Singapore activity. Do not treat an occasional sale as proof that it must register, or as a blanket exemption from doing so. ACRA sets out a specific registration route for foreign-company branches.

Branches and Sub-Entity Codes

For an outlet or division operating within the same registered entity, use that entity’s UEN. If a government service requires a separate branch or sub-entity code, follow its instructions, as that code does not by itself establish a separately registered business. A foreign company’s registered Singapore branch is a different case and follows ACRA’s foreign-company route.

Special UENs Are Optional Numbers

A SUN is a paid choice of available number, not an exemption or a separate legal status. It should also not be confused with an internal branch code or a service-specific account reference.

What to Do After Receiving Your UEN

Save one master record containing your legal name, UEN, and registered address. Then complete the services and compliance tasks relevant to your structure.

Open a Business Bank Account

Prepare the registration documents and the bank’s requested identity and ownership records. Use the exact registered entity name and UEN. Opening a bank account and activating PayNow are separate onboarding steps.

Set Up Corppass Access

For a newly registered entity, Corppass says to wait at least one day before applying for an Admin account. The application uses the UEN and involves the organisation’s Registered Officer approval process. Assign access to the people who need to transact on its behalf.

Arrange Company Secretarial Support

A local company must appoint a company secretary within six months of registration. The sole director cannot also be its company secretary. This obligation relates to the company structure; it should not be applied indiscriminately to every UEN holder.

Check Tax Obligations and Operational Permissions

Assess GST registration obligations separately and arrange InvoiceNow onboarding if your business is in scope. Confirm any licences and Customs setup before starting the relevant activity. Receiving a UEN does not establish that all these steps are complete.

How Can InCorp Help?

Your UEN is one part of a working business setup. The next task is making sure your registration details, payment arrangements, and compliance processes refer to the correct entity.

InCorp can support your company incorporation and corporate secretarial and compliance needs. Contact us to discuss your intended business structure and the steps required to get started.