Singapore Company Tax ID Lookup Guide Easy Ways and Steps

The Ultimate Guide to Checking a Singapore Company Tax Number From Basics to Procedures, Surprisingly Simple!

Businesses or individuals operating in Singapore often need to check company tax information, especially the Corporate Tax Number CTN, which is essential for financial reporting, tax compliance, and communication with authorities. This article will provide a detailed explanation of what a Singapore company tax number is, its purpose, and how to efficiently and accurately query it, helping you easily access this critical information.

1. What is a Singapore Company Tax Number?

The Singapore company tax number, officially known as the Company Tax Number CTN, is a unique identification code assigned by the Inland Revenue Authority of Singapore IRAS to each registered company. This number usually consists of 10 digits in the format S123456789A, where S represents the company type, 123456789 is the company number, and A is the check digit.

This tax number is used to identify and track a company's tax records and is one of the essential pieces of information required during tax filings, invoice issuance, and contract signing.

2. The Role of the Company Tax Number

1. Tax Filing All businesses operating in Singapore must submit tax reports regularly to IRAS, such as the Form C-S/PC for corporate income tax.

2. Invoices and Contracts In business transactions, companies are required to provide their CTN to ensure the legality and compliance of the transaction.

3. Bank Account Opening and Loans Banks often require a company's CTN as part of identity verification when opening an account or providing a loan.

4. Procurement and Bidding Companies participating in projects often need to provide their CTN to prove their legitimacy.

3. Recent News Singapore Enhances Corporate Tax Transparency

According to a report from The Straits Times in May 2025, Singapore is implementing a new tax transparency initiative aimed at improving corporate tax compliance and reducing tax evasion. The new policy requires all registered companies to include complete CTN information when submitting annual financial reports, and IRAS will also strengthen its review of corporate tax data.

In June 2025, IRAS launched a new online service allowing companies to quickly query and update their CTN information electronically, greatly improving the efficiency of tax procedures.

4. How to Check a Singapore Company Tax Number?

Method One Check via the IRAS Website

The IRAS official website, https//www.iras.gov.sg, offers multiple ways to check. Here are the specific steps

1. Visit the IRAS website and click on Company Information under the Businesses menu.

2. Enter the company name or registration number in the search box.

3. The system will display relevant company information, including the CTN.

4. If the information is not directly visible, click on Request for Company Information and fill out the application form.

It should be noted that non-company representatives or authorized personnel may not be able to access the full information directly and may need to provide relevant documents.

Method Two Check through a Company Registration Agent or Lawyer

If a company does not have direct access to the IRAS system, it can seek assistance from a company registration agent or lawyer. These professional institutions usually have access to the IRAS database and can provide detailed company information.

Method Three Use Third-Party Tax Services

In recent years, some third-party tax service platforms have also introduced CTN lookup features, such as TaxLink and MyAccountingOffice. These platforms typically require users to register and verify their identity before using the services.

5. Notes and Common Questions

1. Difference Between Company Tax Number and Company Registration Number

The Company Registration Number is the unique number obtained by a company when registering with the Accounting and Corporate Regulatory Authority ACRA in Singapore, while the Company Tax Number is the tax identification code issued by IRAS. These two should not be confused.

2. Can the Company Tax Number Be Changed?

Generally, the CTN does not change unless there is a major company change, such as restructuring, merger, or liquidation. In such cases, IRAS will issue a new tax number.

3. How to Update Company Tax Number Information?

If the company address, shareholder information, or business scope changes, the company should promptly submit an update application to IRAS to ensure the accuracy of the CTN information.

6. Conclusion

As Singapore places increasing emphasis on tax compliance, it is crucial for businesses to understand how to check their company tax numbers. Whether for daily operations or compliance management, knowing and correctly using the CTN can bring convenience to businesses. Querying through official channels or professional institutions is not only safe and reliable but also helps avoid risks of information leakage.

For businesses starting or investing in Singapore, timely access and updating of CTN information is a fundamental guarantee for smooth business operations. We hope this article provides you with practical information and helps you easily handle various tax inquiries.