Demystifying Form C-S, Form C-S (Lite), and Form C in Singapore.

Navigating Corporate Tax Compliance: Demystifying Form C-S, Form C-S (Lite), and Form C in Singapore.


In the complex landscape of corporate taxation in Singapore, accurate and timely filing of tax returns is crucial for businesses. Form C-S, Form C-S (Lite), and Form C are integral components of the Corporate Income Tax Return, enabling companies to declare their actual income. In this comprehensive guide, we break down the nuances of each form, helping businesses understand their eligibility criteria, filing requirements, and the benefits of choosing the right form.

Understanding Form C-S, Form C-S (Lite), and Form C:

What is Form C-S?

Form C-S is a simplified Corporate Income Tax Return designed for qualifying small companies to report their income to the Inland Revenue Authority of Singapore (IRAS). It has fewer fields compared to Form C, streamlining the filing process for smaller enterprises.

What is Form C-S (Lite)?

Form C-S (Lite) is a simplified version of Form C-S, specifically tailored for companies with straightforward tax matters. It requires completion of only 6 essential fields, offering a quick and efficient filing option for eligible businesses.

What is Form C?

Form C is the comprehensive Corporate Income Tax Return for companies with more complex financial structures. It involves providing detailed information on income, expenses, and tax computations.

Filing Requirements:

Form C-S:

  • Annual revenue of $5 million or below.
  • Only derives income taxable at the corporate tax rate of 17%.
  • Not claiming specific exemptions (e.g., Carry-back of Current Year Capital Allowances/Losses, Group Relief, Investment Allowance, Foreign Tax Credit).

Form C-S (Lite):

  • Annual revenue of $200,000 or below.
  • Simplified version with only 6 essential fields.
  • Similar exemptions criteria as Form C-S.

Form C:

  • Annual revenue exceeding $5 million.
  • Complex financial structures requiring detailed information.
  • Claims for exemptions as applicable.

Benefits of Using Form C-S or Form C-S (Lite):

  1. Time Efficiency: Streamlined filing process for small businesses with fewer fields to complete.
  2. Reduced Documentation: Simplified requirements mean less documentation for eligible companies.
  3. No Requirement for Financial Statements and Tax Computation: Companies filing Form C-S or Form C-S (Lite) are not required to submit financial statements and tax computation. These documents are only needed upon IRAS’ request.

Filing Process:

Form C-S and Form C-S (Lite):

  1. Complete the form online through the IRAS myTax Portal.
  2. No requirement to file financial statements and tax computation initially.

Form C:

  1. Comprehensive financial information required.
  2. File Form C within one month from the date of issuance.


Choosing the right form—Form C-S, Form C-S (Lite), or Form C—is crucial for efficient and compliant tax filing in Singapore. Understanding eligibility criteria and filing requirements empowers businesses to navigate the process seamlessly, ensuring timely submissions and compliance with IRAS regulations. Whether opting for simplicity with Form C-S or addressing complexities with Form C, companies can approach tax filing with confidence and accuracy. Learn more about how to file Form C and make informed decisions to meet your business’s unique needs. Laern more on our tax compliance services here.