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Guidance on Completing Form C-S/ C

Guides to complete the Corporate Income Tax Return (Form C-S/ C) online or via paper filing. All companies are encouraged to e-File your Form C-S/ C! Go paperless!

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Before Completing Form C-S/ C

All companies need to prepare the following before completing the Corporate Income Tax Return (Form C-S/ C):

  • the audited/ unaudited financial statements,
  • tax computation and supporting schedules, and
  • other claim forms

For more details, please refer to Documents to Prepare when Filing Form C-S/ C.

If your company’s functional currency is not in “Singapore Dollar”, you have to inform IRAS by logging in to mytax.iras.gov.sg and updating it via the "Update Corporate Profile/ Contact Details" e-Service. You may refer to the following user guides for more information:

• “Update Corporate Profile/ Contact Details” User Guide (company) (1.21MB)
• “Update Corporate Profile/ Contact Details” User Guide (tax agent) (1.29MB)

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Authorise Users for Corporate Tax Matters

The company must first authorise its staff or tax agent for "Corporate Tax (Filing and Applications)" in CorpPass before they can log in to e-File Form C-S/ C on behalf of the company. For assistance on CorpPass setup, please refer to Step-by-Step Guides.

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Filing Form C-S

e-Filing of Form C-S

Paper Filing of Form C-S

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Filing Form C

e-Filing of Form C


You can e-File Form C in two ways:

ModesHow to e-FileSuitable for 

Online Form C

 

Available now 

Complete and file Form C online. Attach tax computation, financial statements, detailed profit & loss statement, other supporting documents and submit them to IRAS. All companies/ tax agents 

Form C (Upload)

 

Available now

Download and complete Form C (PDF format) on your local machine. No signature is required in Part V Declaration. When the Form C is completed and the file is saved in your local drive, upload it to myTax Portal and submit it together with tax computation, financial statements, detailed profit & loss statement and other supporting documents. Please upload the original Form C (PDF Format). Do NOT upload a scanned or printed copy of Form C.Companies/ tax agents who need to present the completed Form C to relevant personnel/ clients prior to submitting the Form C to IRAS

 

Online Form C:

Form C (Upload):

Paper Filing of Form C

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