Form C-S

New! The e-Service File Form C-S and softcopy of Form C-S in PDF format for Year of Assessment (YA) 2018 is now available.

Form C-S is a simplified 3-page income tax return for companies to report their income to IRAS. Qualifying companies may use Form C-S, instead of Form C, to report their income.

e-File Form C-S via and enjoy these benefits!

  • Auto-computation of certain fields that minimise filing errors
  • An instantaneous estimate of tax payable
  • iHelp for step-by-step guidance
  • Extra 15 days to e-File

Find out more about the Benefits of e-Filing Form C-S, the e-Service and Tips on e-Filing Form C-S.

If your company cannot e-File Form C-S, please download the softcopy of Form C-S by clicking on the relevant YA below:

Please complete, print and submit the signed Form C-S by the filing due date to avoid enforcement actions such as composition or summons issued to the company. 

If your company was dormant and had previously been granted a waiver of filing the Income Tax Return, but has now re-commenced business or is now receiving income, please complete and submit the Request for Income Tax Return (Form C-S/ C) and Notification of New Financial Year End (909KB) form by post or send us an email at myTax Mail.

Document Identification Number (DIN)

DIN is a unique number code that is generated by IRAS to identify each Income Tax Return (Form C-S/ C) issued.

DIN is to be entered in the DIN worksheet of the Form C-S which you have downloaded. When you enter the DIN, it will be automatically populated on page 1 of the Form C-S.

You can obtain DIN from the View DIN e-Service.

If DIN is not available, please send us an email via myTax Mail.

* If the company does not meet the conditions for filing Form C-S, you can e-File or download Form C (Upload) (PDF format). If you are downloading the Form C for paper filing, the DIN must be entered in the DIN worksheet of the Form C. The DIN is the same whether you use Form C-S or Form C. 

Basic Corporate Tax Calculator

The Basic Corporate Tax Calculator is designed for trading companies and it comes with commonly used schedules such as the capital allowance schedule. You can use it to prepare your company’s tax computation and work out the tax payable before completing Form C-S.

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