Corporate Tax & GST in Singapore:

Accounting Services in Singapore:

Understanding corporate tax and GST in Singapore is essential for businesses operating in one of Asia’s leading commercial and financial hubs. Whether you are establishing a new company, expanding an existing business or managing a Singapore subsidiary, proper tax compliance helps reduce unnecessary risks, avoid filing issues and maintain accurate financial records.

Singapore’s corporate tax and GST systems are administered by the Inland Revenue Authority of Singapore (IRAS). The key requirements can vary depending on the company’s activities, financial year, taxable income and GST status.

This practical guide explains the fundamentals of Corporate Tax Singapore, corporate tax filing requirements and GST Singapore obligations for businesses.

1. What Is Corporate Tax in Singapore?

Singapore imposes Corporate Income Tax (CIT) on companies based on their chargeable income.

The current Singapore corporate tax rate is 17% of chargeable income, applicable to both local and foreign companies. Chargeable income generally refers to taxable income after deducting allowable expenses and applicable tax adjustments.

Singapore operates on a preceding-year basis for corporate income tax. This means income earned during a financial year is generally assessed in the following Year of Assessment (YA).

For example, income earned during a company’s 2025 financial year would generally be assessed in YA 2026.

However, the actual tax payable may differ from simply applying 17% to accounting profit because companies may need to consider tax adjustments, allowable expenses, capital allowances, exemptions and other applicable tax treatments.

2. Corporate Tax Filing Requirements in Singapore

Companies generally have two main corporate income tax filing obligations with IRAS:

Estimated Chargeable Income (ECI)

ECI is an estimate of a company’s taxable profits for a Year of Assessment.

Companies generally need to file their ECI within three months from the end of their financial year, unless they qualify for an applicable ECI filing waiver or are specifically not required to file.

Companies may qualify for an ECI filing waiver when both of the following conditions are met:

• Annual revenue is S$5 million or below; and
• ECI is nil for the YA.

The applicable conditions should be reviewed based on the company’s circumstances and the latest IRAS requirements.

Corporate Income Tax Return

Companies also need to file the appropriate Corporate Income Tax Return, such as Form C-S, Form C-S (Lite) or Form C, depending on their circumstances.

The general filing deadline is 30 November each year.

For YA 2026, IRAS states that all companies must file their Corporate Income Tax Return by 30 November 2026, unless an applicable waiver has been granted.

This makes maintaining accurate accounting records throughout the year particularly important.

3. What Is GST in Singapore?

Goods and Services Tax (GST) is a consumption tax imposed on goods and services supplied in Singapore, as well as certain imported goods and services under the relevant GST rules.

The current GST rate in Singapore is 9%. GST-registered businesses generally charge and account for GST at 9% on standard-rated supplies, unless the supply qualifies for zero-rating or exemption under the GST rules.

For businesses, GST is therefore not simply another operating expense. A GST-registered business generally collects GST from customers and accounts for the tax to IRAS, subject to the applicable rules.

4. When Does a Business Need to Register for GST?

GST registration may be compulsory when a business’s taxable turnover exceeds the applicable registration threshold.

Under the current rules, compulsory GST registration applies when taxable turnover is:

• More than S$1 million at the end of a calendar year under the retrospective view; or
• Expected to be more than S$1 million in the next 12 months under the prospective view.

Taxable turnover generally includes taxable supplies made in Singapore, including standard-rated and zero-rated supplies, subject to the applicable rules.

Businesses should monitor their turnover regularly rather than waiting until the end of the financial year to consider their GST obligations.

5. What Are the Responsibilities of a GST-Registered Business?

Once a business becomes GST-registered, it has ongoing compliance responsibilities.

According to IRAS, these include:

• Charging and accounting for GST on standard-rated supplies
• Filing GST returns and paying GST due on time
• Maintaining proper business and accounting records
• Displaying prices inclusive of GST where required
• Issuing tax invoices containing the required information
• Notifying IRAS of relevant changes
• Meeting applicable obligations when deregistering from GST.

For standard-rated supplies made in Singapore, a GST-registered business generally needs to charge and account for 9% GST.

Proper bookkeeping is therefore closely connected to GST compliance.

6. Corporate Tax vs GST: What Is the Difference?

Corporate Income Tax and GST serve different purposes.

The two systems can also interact operationally because accurate accounting records are needed to support both corporate tax reporting and GST compliance.

7. Why Accurate Accounting Matters for Tax Compliance

Tax compliance starts with reliable financial information.

Accurate bookkeeping allows businesses to:

Track income and expenses

Proper records help businesses identify revenue, expenses and transactions that may be relevant for tax reporting.

Prepare tax computations

Accounting information provides the foundation for preparing corporate tax computations and determining the company’s taxable position.

Monitor GST

Businesses can better track output GST, input GST and taxable supplies when their accounting records are properly maintained.

Prepare financial statements

Accurate financial statements provide management with a clearer picture of business performance and can support tax, audit and regulatory requirements.

Reduce compliance risks

Incomplete or inaccurate records can make tax filing more difficult and increase the risk of errors or missed obligations.

For growing businesses, professional accounting and tax services in Singapore can help establish a more structured compliance process.

8. Common Tax Challenges for Businesses in Singapore

Businesses may face several challenges when managing corporate tax and GST obligations, including:

• Understanding which expenses are tax-deductible
• Preparing accurate tax computations
• Meeting ECI and corporate tax filing deadlines
• Determining whether GST registration is required
• Maintaining appropriate GST records
• Reconciling accounting records with tax filings
• Managing compliance across multiple entities
• Keeping track of changing tax requirements

These challenges can become more complex as a business grows or begins operating across multiple jurisdictions.

9. When Should You Consider Professional Tax Services?

Professional support may be useful when a company:

• Is newly incorporated in Singapore
• Has limited internal accounting resources
• Needs assistance with corporate tax filing
• Is approaching the GST registration threshold
• Has international shareholders or group companies
• Requires ongoing bookkeeping and financial reporting
• Wants to coordinate accounting, tax and corporate compliance

The objective is not simply to complete a tax return. A well-managed process should help ensure that financial information, tax filings and corporate compliance are properly coordinated.

10. How Coretrust Supports Businesses in Singapore

Coretrust Global Advisory Pte. Ltd. provides integrated professional support for businesses operating in Singapore.

Under its File & Advise services, Coretrust supports areas including:

• Corporate income tax
• ECI and corporate tax filing
• GST-related requirements
• Withholding tax
• Tax residency matters
• Payroll and CPF
• IR8A
• Business advisory and finance support

These services can be coordinated with Coretrust’s broader Account & Report and Set Up & Maintain services, providing businesses with a more connected approach to accounting, tax and corporate compliance.

For businesses that require audit support, Coretrust also provides Audit & Assurance services through appropriately registered audit professionals, subject to the applicable engagement requirements.

Conclusion

Understanding Corporate Tax Singapore and GST Singapore is an important part of operating a compliant business.

With a 17% corporate income tax rate, a 9% GST rate, ECI filing requirements and annual corporate tax filing obligations, businesses need accurate records and a clear compliance process.

Tax obligations can become increasingly complex as a company grows, expands internationally or manages multiple compliance requirements.

Having the right accounting, tax and corporate support can help businesses stay organised, meet important deadlines and make better-informed decisions. 

Need support with corporate tax, GST or accounting in Singapore?

Discuss Your Tax & GST Needs with Coretrust.

Sources & References

1. Inland Revenue Authority of Singapore (IRAS) — Corporate Income Tax Rates.

2. IRAS — Basic Guide to Corporate Income Tax for Companies.

3. IRAS — Estimated Chargeable Income (ECI) Filing.

4. IRAS — Corporate Income Tax Filing Season 2026.

5. IRAS — Goods and Services Tax (GST) Rates.

6. IRAS — Do I Need to Register for GST?

7. IRAS — Responsibilities of GST-registered Businesses.

8. IRAS — Current GST Rates.