Singapore has one of the more straightforward business registration systems in the world. ACRA (Accounting and Corporate Regulatory Authority) handles all entity registration through its BizFile+ portal, and every registered entity gets a UEN (Unique Entity Number). That nine or ten-digit number is your identity for every B2B transaction in Singapore: corporate supplier portals, government procurement, banking, GST filings, and contracts.
If you want to sell to a Singapore company of any size, you will need a UEN. This guide walks through the four entity types, which one fits different supplier situations, what registration costs, and exactly what documents the major procurement portals ask for when you show up as a Singapore entity.
The four entity types and what they mean for suppliers
Sole proprietorship. One owner, unlimited personal liability. Registration costs $115 SGD for one year or $175 SGD for three years. You can register in a single day online. The UEN format for sole proprietorships ends in a letter suffix (e.g., 53123456A). The downside for supplier work: many mid-size and large corporate buyers in Singapore require a Pte Ltd counterparty before signing supplier agreements above a certain value, typically $50,000 SGD or more annually. Check your target buyer's vendor policy before registering as a sole prop.
Private Limited Company (Pte Ltd). The default choice for any supplier planning to work with enterprise buyers. Shareholders have limited liability. Registration costs $315 SGD through BizFile+. You need at least one director who is ordinarily resident in Singapore (a Singapore citizen, PR, or valid Employment Pass holder), plus a registered address. Processing takes one to three business days if ACRA does not flag your application for review. UEN format: begins with the year of incorporation (e.g., 202412345K). Most corporate procurement portals accept a Pte Ltd without additional vetting questions about entity type.
Branch office. A foreign company operating in Singapore under its parent company's name and legal identity. The parent is liable for branch obligations. Registration requires submitting the parent company's certificate of incorporation, memorandum and articles of association, and a list of directors. Government fee: $300 SGD. The UEN format for branches includes a "T" prefix followed by year digits. Branch offices work for corporate supplier portals but some government procurement platforms treat them differently from locally incorporated entities.
Representative office. Cannot conduct revenue-generating activities. It exists for market research, liaison, and promotion. You cannot issue invoices, sign commercial contracts, or receive payment under a representative office. If your goal is to supply goods or services, a representative office is the wrong structure. Mention it here only because it causes confusion when foreign companies first explore Singapore entry.
Which entity type fits your situation
Most suppliers should register as a Pte Ltd. The $200 SGD premium over a sole proprietorship buys you limited liability, broader acceptance on corporate procurement platforms, and the ability to bring in investors or co-founders later without reregistering.
Sole proprietorship makes sense if you are a freelancer or independent consultant with a single, known client, your contracts are below $50,000 SGD annually, and you have confirmed the buyer accepts sole proprietors on their vendor panel.
A branch office makes sense if you are a foreign company that has already won a contract in Singapore and your parent wants operational continuity under the parent brand. It avoids creating a separate legal entity but keeps the parent exposed to Singapore liabilities.
The ACRA registration process
All registration happens at BizFile+ (bizfile.acra.gov.sg). You will need a Singpass or Singpass Foreign User Account (SFUA) to log in. Foreign nationals who are not Singapore residents need to apply for an SFUA first, which requires a valid Singapore contact address and takes two to five business days to process.
For a Pte Ltd, prepare:
- Company name (ACRA checks availability instantly; names too similar to existing entities are rejected)
- Registered local address (a registered address service provider works; costs roughly $200 to $500 SGD per year from commercial providers)
- At least one director ordinarily resident in Singapore with their NRIC or passport details
- Shareholder details and share allocation
- Paid-up capital amount (no minimum required by law; $1 SGD is legal but some corporate buyers ask for paid-up capital of at least $50,000 SGD)
- SSIC code (Singapore Standard Industrial Classification) for your primary business activity
After submission, ACRA reviews and typically approves within one to three business days. You receive an incorporation certificate and your UEN by email.
For a sole proprietorship, the process is faster: name, SSIC code, registered address, and owner NRIC. Most approvals happen the same day.
What a UEN unlocks
Once you have a UEN, you can:
Open a corporate bank account. DBS, OCBC, UOB, and all major Singapore banks require a UEN before opening a business account. Some fintechs (Aspire, Airwallex) have lighter documentation requirements but still require a UEN and ACRA certificate.
Register on GeBIZ. GeBIZ (Government Electronic Business) is Singapore's government procurement portal. It handles all public sector tenders and quotations above $6,000 SGD. Supplier registration on GeBIZ requires your UEN, company details, and a GeBIZ Trading Partner account. Without a UEN, you cannot bid on any Singapore government contract.
Register on corporate procurement portals. SAP Ariba, Coupa, Jaggaer, and Zycus all ask for a UEN as a primary identifier for Singapore-based suppliers. See the next section for portal-specific documents.
Apply for grants. Enterprise Development Grant (EDG), Productivity Solutions Grant (PSG), and other Enterprise Singapore schemes require a UEN and proof of local incorporation.
GST registration and the $1 million threshold
Singapore's Goods and Services Tax (GST) rate is 9% as of 2024. Registration is mandatory once your taxable turnover exceeds $1 million SGD in a 12-month period, or if you expect to exceed $1 million SGD in the next 12 months.
Voluntary registration is available below the threshold. Some enterprise buyers prefer or require GST-registered suppliers because they can claim input tax credits. If your primary customers are GST-registered businesses, voluntary registration often makes practical sense even before you hit $1 million.
GST registration happens through myTax Portal at IRAS (Inland Revenue Authority of Singapore). You will need your UEN, financial statements or projected revenue, and banking details for refund purposes. Approval typically takes two to four weeks.
Documents required by major corporate procurement portals
Each portal has slightly different requirements, but the core set for a Singapore Pte Ltd is consistent.
SAP Ariba. You will need: ACRA business profile (downloadable from BizFile+ as a PDF, costs $5.50 SGD), UEN, bank account details in the format the buying organization requires, GST registration number if applicable, and a W-8BEN-E or equivalent tax form if the buying organization is US-headquartered. Some Ariba networks also request a signed supplier code of conduct.
Coupa. Coupa Supplier Portal (CSP) registration asks for legal entity name matching your ACRA certificate exactly, UEN, registered address, primary contact, and banking details. If the buyer uses Coupa Pay, you will also need to verify your bank account through Coupa's micro-deposit or instant verification process. Upload your ACRA business profile as the supporting document for entity verification.
Jaggaer (formerly SciQuest / BravoSolution). Jaggaer's supplier portal asks for ACRA certificate of incorporation, UEN, business profile, list of directors, and sometimes a financial reference or audited accounts if the contract value is above a buyer-defined threshold (commonly $100,000 SGD or $500,000 SGD).
GeBIZ (government). GeBIZ registration requires UEN, company name matching ACRA records, SSIC code, contact details, and bank account details for payment. Government agencies pay through GIRO, so your bank account must support GIRO transactions (all major Singapore banks do).
A consistent mistake: the legal entity name on your ACRA certificate must match the name you enter on every portal exactly, including "Pte. Ltd." vs "Pte Ltd" variations. Mismatches trigger manual review or rejection. Download your ACRA business profile and copy the name character for character.
Keeping your registration current
ACRA requires sole proprietorships and partnerships to renew annually or every three years. Pte Ltds do not renew registration but must file annual returns within seven months of their financial year-end. Filing the annual return costs $60 SGD for companies with share capital below $25,000 SGD and $160 SGD above that threshold.
If your registered address changes, update it with ACRA within 14 days. Procurement portals that store your ACRA business profile will flag a mismatch if your address on file differs from your ACRA record. Some buyers pull ACRA data automatically through the Myinfo Business API to verify supplier details.
The UEN itself never changes. It follows the entity for its entire existence. That is the one stable identifier across every procurement relationship in Singapore.
