The deadline for filing your Corporate Income Tax Return (Form C-S/ Form C-S (Lite)/ Form C) for the Year of Assessment (YA) 2023 is 30 Nov 2023.

Filing of the Corporate Income Tax Return

How do I file via

In order to file via, you have to first be authorised by your company to act for its Corporate Income Tax matters via Corppass. View our step-by-step guides for assistance on Corppass setup.  

Which Corporate Income Tax Return should I file (Form C-S, Form C-S (Lite) or Form C)?

Form C-S is for companies that:

  • Are incorporated in Singapore;
  • Have an annual revenue of $5 million or below;
  • Derive income taxable at the prevailing Corporate Income Tax rate of 17%; and
  • Are not claiming the following:
    • Carry-back of Current Year Capital Allowances/ Losses
    • Group Relief
    • Investment Allowance
    • Foreign Tax Credit and Tax Deducted at Source

Form C-S (Lite) is for companies that qualify to file Form C-S and have an annual revenue of $200,000 or below.

Form C is for companies that do not qualify to file Form C-S or Form C-S (Lite). Financial statements, tax computations and supporting schedules must be filed together with Form C.

Preparing a Tax Computation

What income is taxable?

Taxable income refers to:

  • Gains or profits from any trade or business
  • Income from investment such as dividends, interest and rental
  • Royalties, premiums and any other profits from property
  • Other gains that are revenue in nature

Such income is taxed when it is:

  • Accrued in or derived from Singapore; or
  • Received in Singapore from outside Singapore

Learn more about taxable and non-taxable income or watch this video on the Taxability of Income (5m 44s).

What expenses are deductible and what are the common tax reliefs and deductions for companies?

You may claim tax deductions on expenses 'wholly and exclusively' incurred in the production of income.

Learn more about the deductibility of expenses and the tax reliefs available to lower your tax burden. You may also watch this video on the Tax Deductibility of Expenses (4m 59s).

How do I work out my company’s tax payable?

Use the IRAS Basic Corporate Income Tax Calculator to compute the amount of taxes your company has to pay. Explanatory notes to guide you through tax computation and validation checks against common errors are included in the calculator.

How do I prepare the tax computation for my investment holding company?

An investment holding company is a company that owns investments such as properties and shares for long term investment, and derives investment income (non-trade income) such as dividend, interest or rental income. 

Learn how to prepare the tax computation for your investment holding company.

Filing Status

How do I check the status of my Corporate Income Tax Return submission and assessment?

The status of your company's Corporate Income Tax Return and tax assessment can be found at or through the Corporate Income Tax Integrated Phone Service. Learn how to check your Form C-S/ Form C-S (Lite)/ Form C submission and assessment status.

Your company’s filing status may only be viewed at the View Corporate Tax Filing Status digital service at 3 working days after you have filed your company’s Form C-S/ Form C-S (Lite)/ Form C.

How do I make changes to my Corporate Income Tax Return submission?

Revise the amount declared and/or submit a revised tax computation via the Revise/ Object to Assessment digital service at Learn more about making changes to your company’s tax submission.

Tax Bill

When will I get my tax bill?

View the IRAS tax assessment process for an overview of the tax return review cycle and timeline that you can expect to get your tax bill, also known as the Notice of Assessment. After your Notice of Assessment is issued, you can access it via the View Corporate Tax Notices/ Letters digital service at

What should I do if I do not agree with my tax bill?

File your objection via the Revise/ Object to Assessment digital service at within 2 months from the date of the Notice of Assessment if you wish to have your tax assessment reviewed and revised. 

Learn more about the objection and appeal process.

How do I pay my tax?

Payment must be made within 1 month from the date of the Notice of Assessment, notwithstanding any objections. Payment modes include GIRO (preferred), PayNow QR, AXS, Internet Banking and other electronic payment modes. 

Learn more about the payment methods for Corporate Income Tax.