Filing Form C in Singapore: Documents and Process

In this comprehensive guide, we will delve into the intricacies of Form C in Singapore, shedding light on its nuances, variations such as Form C-S and Form C-S (Lite), the filing procedures, required documents, and the repercussions of late submissions.


    Note:This form is not for job seekers

    or salary employees.

    Table of Contents

    As a business owner or investor in Singapore, staying on top of regulatory requirements is crucial for the smooth operation and growth of your enterprise. One such essential aspect is the filing of tax returns through various forms, with Form C in Singapore being a pivotal document in this process. 

    In this comprehensive guide, we will delve into the intricacies of Form C, shedding light on its nuances, variations such as Form C-S and Form C-S (Lite), the filing procedures, required documents, and the repercussions of late submissions.

    What is Form C in Singapore?

    Form C is a key component of the tax filing system in Singapore, mainly made to help businesses report to the Inland Revenue Authority of Singapore (IRAS) their income, gains, and tax computations. This annual filing is a mandatory requirement, ensuring transparency and accountability in the financial dealings of businesses operating in the country.

    What is Form C-S (Lite)?

    In recent years, the IRAS has introduced simplified versions of Form C, known as Form C-S and Form C-S (Lite), to streamline the filing process for qualifying small companies. Form C-S (Lite) is specifically tailored for small companies with straightforward financials, providing a more accessible and efficient way to fulfill their tax obligations.

    What is Form C-S?

    Form C-S, on the other hand, is an abbreviated version of the standard Form C, catering to companies with an annual revenue not exceeding SGD 5 million. This streamlined form is designed to simplify the tax filing process for eligible businesses, allowing them to navigate the regulatory landscape with ease.

    When to File Form C-S (Lite) or Form C?

    The choice between Form C-S (Lite) and Form C depends on the size and complexity of your business. Small corporations meeting specific criteria, such as having an annual revenue of SGD 200,000 or less, are eligible to file using Form C-S (Lite). Larger companies, exceeding this revenue threshold, must opt for the standard Form C.

    How to File Form C-S (Lite) or Form C?

    Filing Form C-S (Lite)

    • Log in to mytax.iras.gov.sg: Access the IRAS portal using your company’s SingPass or CorpPass.
    • Select Form C-S (Lite): Navigate to the “File Form C-S (Lite)” section on the portal.
    • Complete the Form: Fill in the required fields, ensuring accuracy and completeness.
    • Submit the Form: After reviewing the information, submit the form digitally via the platform.
    • Receive Acknowledgment: Once submitted, you will receive an acknowledgment of the successful filing.

    Filing Form C

    • Access the Form C: Log in to mytax.iras.gov.sg and select the “File Form C” option.
    • Provide Financial Information: Input the necessary financial details, including income, gains, and tax computations.
    • Verify and Submit: Review the information for accuracy before submitting the completed form.
    • Acknowledgment and Payment: Receive acknowledgment of submission and settle any tax payable.

    Documents Needed to Complete Form C

    For companies required to file Form C, the following documents are essential:

    • Detailed Financial Statements: These include a comprehensive income statement and balance sheet. They ought to present a clear image of the business’s fiscal year-over-year financial performance and status.
    • Schedules and Notes to Financial Statements: Detailed schedules of fixed assets, debtors, creditors, and other relevant financial notes are necessary. These schedules provide a breakdown of the figures in the financial statements and are crucial for accurate tax computation.
    • Director’s Report: This report is a mandatory submission for companies filing Form C. It typically includes the company’s principal activities, financial performance, and future outlook.
    • Tax Computation: A detailed computation of taxable income, including adjustments for non-deductible expenses and non-taxable income, is required. This document should reconcile the income in the financial statements with the income declared in Form C.
    • Supporting Schedules: Depending on the nature of the business, various supporting schedules may be required. These can include schedules for unabsorbed losses, capital allowances, donations, and foreign income.

    Documents Required for Filing Form C-S and Form C-S (Lite)

    For smaller companies eligible to file Form C-S or Form C-S (Lite), the documentation is less extensive:

    • Summary of Income and Expenses: A simplified profit and loss account that outlines the main sources of income and categories of expenses.
    • Tax Computation (if applicable): For some companies, especially those with more complex tax situations, a basic tax computation might be required. This includes adjustments to the accounting profit to arrive at the taxable income.
    • Information on Tax Exemptions and Reliefs: Information on applicable tax exemptions and reliefs that the company is claiming, such as the Partial Tax Exemption or the Start-Up Tax Exemption.
    • Records of Fixed Assets: If the company claims capital allowances, records of fixed assets purchases, disposals, and their usage are necessary.

    Penalty for Late Submissions

    Timeliness is of the essence when it comes to tax filings in Singapore. Failure to submit Form C or Form C-S (Lite) by the stipulated deadline can result in penalties. The IRAS imposes late filing fees, which increase gradually according to the length of the delay. It’s imperative to adhere to the deadlines to avoid unnecessary financial implications for your business.


    Navigating the tax landscape in Singapore demands a clear understanding of the various forms and their implications. Form C, Form C-S, and Form C-S (Lite) cater to the diverse needs of businesses, offering flexibility while ensuring compliance. By comprehending the distinctions between these forms, business owners and investors can make well-informed choices that suit the size and kind of their companies.


    The deadline for filing Form C and Form C-S (Lite) is typically November 30th of each year. It is imperative to visit the IRAS website to see if the deadline has changed or has been updated.

    No, only small companies meeting specific criteria, such as having an annual revenue of SGD 200,000 or less, are eligible to use Form C-S (Lite). Larger companies must use the standard Form C.

    Late submissions are subject to penalties imposed by the IRAS. The penalties increase with the duration of the delay, emphasizing the importance of adhering to the filing deadlines.

    Exemptions are not automatic, and businesses must fulfil certain requirements in order to be qualified. 

    Yes, amendments can be made within a certain period after submission. However, it’s crucial to rectify any errors promptly to avoid additional complications.