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About Form C-S
  • Mandarin version (426KB)

Qualifying Conditions for Filing Form C-S

How to File Form C-S
   • e-File Form C-S
   • Submit Paper Form C-S

Benefits of e-Filing Form C-S

Due Date to File Form C-S

Brochures on Form C-S

Frequently Asked Questions (FAQs)

Corporate Tax Seminars and Form C-S e-Filing Workshops

Contact Us

About Form C-S

As part of IRAS’ efforts to simplify the filing procedure for small companies, a new Form C-S has been introduced from Year of Assessment (YA) 2012. Form C-S is a shortened 3-page Income Tax Return for small companies to report their income to IRAS.  Small companies that meet the conditions may use Form C-S, instead of Form C, to declare their income from YA 2012 onwards.

Compared with the Form C, Form C-S has half the line items comprising:

  • A statement declaring that the company is eligible for Form C-S filing;
  • Information on tax adjustments; and
  • Information from the financial accounts.

Essential tax and financial information applicable to most small companies are required in Form C-S.  Hence, small companies only need to provide these essential tax and financial information in Form C-S.

Qualifying Conditions for Filing Form C-S

Your company qualifies for Form C-S filing if it meets the following conditions for the YA:

 Company: Does not claim any of the following: 
  • Is incorporated in Singapore
  • Has an annual revenue* of $1 million or below
  • Derives only income taxable at 17%

* Revenue refers to the main income source of the company excluding separate source income such as interest.

Companies that do not meet the conditions have to submit to IRAS a full set of tax return comprising Form C, financial accounts, tax computation and supporting schedules.

You may use the Form C-S Eligibility Checklist (18KB) to find out whether your company should file Form C-S or Form C. If the company is eligible to file Form C-S, you may either:

Companies are required to prepare financial statements and tax computation:

Although small companies filing Form C-S are not required to submit their financial statements and tax computations together with Form C-S, they are still required to maintain proper records of their transactions and prepare their financial statements and tax computations. Such records are to be retained and submitted upon IRAS’ request.

How to File Form C-S

Your company may either:

Find out about the Benefits of e-Filing Form C-S, the e-Service “File Income Tax Return (Form C-S)” and Tips on e-Filing Form C-S.

If your company received Form C but meets the qualifying conditions for filing Form C-S, you may either e-File Form C-S or download a copy of Form C-S for completion.  You do not need to return the Form C to IRAS for cancellation.

View the Form C-S Interactive e-Filing Guides (prototypes):

Benefits of e-Filing Form C-S

Small companies eligible to file Form C-S are encouraged to e-File as you will:

  • Enjoy an extended filing due date till 15 Dec, instead of 30 Nov when you e-File. 
  • Enjoy filing convenience via myTax Portal with:
    • iHelp facility to guide you along as you e-File
    • In-built formulae to auto-compute certain fields
    • Auto-computation of estimated tax payable
    • Save draft function which allows you to save a draft copy of the tax return up to 15 Dec, until it is ready for submission to IRAS.
  • Receive instant acknowledgement when you have successfully e-Filed.

Due Date to File Form C-S

Form C-S must be submitted to IRAS by 30 Nov.  The due date for e-Filing of Form C-S is extended till 15 Dec and does not apply if you submit paper Form C-S.

Brochures on Form C-S

Frequently Asked Questions (FAQs)

For more details, please refer to our FAQs (208KB) and Essential information to note when filing Form C-S (174KB).

Corporate Tax Seminars and Form C-S e-Filing Workshops

IRAS has a series of seminars to help you understand your company’s tax filing obligations and Form C-S. Find out more about these seminars.

IRAS will also conduct half-day e-Filing workshops to guide companies and tax intermediaries on e-Filing of Form C-S from Aug this year. The workshop schedule and details will be released by Jul 2013.

Contact Us

Please contact us if you need assistance or clarification on Form C-S:

  • Email address:
  • Call us (8 am to 5 pm from Mondays to Fridays):
    1800-356 8622


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Last Updated on 17 April 2014

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