By Lucas Seah, Founder of Excellence Singapore Group | Last Updated: October 2026

With the November 30, 2026

e-Filing deadline approaching, many Singapore business owners are finalising their Corporate Income Tax Returns (Form C-S/C).
The good news for YA 2026 is the Corporate Income Tax (CIT) Rebate. For YA 2026, the Government has confirmed a 50% Corporate Income Tax Rebate, capped at S$40,000 (including a S$2,000 CIT Rebate Cash Grant for companies that made CPF contributions for at least one local employee in 2025).

However, if you miss the Nov 30 deadline or file incorrectly, you risk fines that could outweigh these savings. Here is your emergency checklist to filing on time and maximizing your rebate.

1. What is the YA 2026 Tax Rebate?

For YA 2026, the Ministry of Finance has announced a 50% Corporate Income Tax Rebate, capped at S$40,000.

How it works:

  • Profitable Companies: If you have tax to pay, you get a 50% discount on the bill (up to $40k).

  • Loss-Making Companies: If you made no profit (and thus pay no tax), you can still receive the S$2,000 CIT Rebate Cash Grant, provided your company is active and made CPF contributions for at least one local employee (Singapore Citizen/PR, excluding shareholder-directors) in 2025.

Important: You do not need to apply separately for this. IRAS computes the rebate automatically when it assesses your Corporate Tax Return. Eligible companies received the cash grant automatically by the second quarter of 2026. If yours qualified but did not receive it, you can appeal to IRAS via myTaxMail by 30 November 2026.

2. Which Form Must I File by Nov 30?

All companies must e-File by November 30 2026 (paper filing has been discontinued). This return is separate from the Estimated Chargeable Income (ECI), which is due within 3 months of the financial year end. The form you use depends on your revenue:

Form C-S (Lite)

  • Revenue: Annual revenue is S$200,000 or below.

  • Ease: The simplest form. You only need to declare 6 essential figures (Revenue, Net Profit/Loss, etc.).

Form C-S

  • Revenue: Annual revenue is S$5 million or below.

  • Condition: Your income must be derived at a standard 17% rate (no special incentives).

Form C

  • Revenue: Annual revenue is above S$5 million.

  • Requirement: You must submit detailed financial statements and tax computations.

Expert Warning: Even if your company is dormant (inactive), you MUST still file a “Dormant Company Return” unless you have been granted a waiver by IRAS. Failure to file usually results in a court summons.

3. Common Mistakes to Avoid this Week

In the rush to meet the deadline, we see business owners make costly errors:

  • Mistake 1: Confusing “Financial Year” with “Year of Assessment”

    • YA 2026 refers to the financial year that ended in 2025. Use your FY2025 accounts, not your FY2026 ones!

  • Mistake 2: Forgetting Tax Exemptions for New Startups

    • If your company is in its first three Years of Assessment, it may be eligible for the Tax Exemption Scheme for New Start-Up Companies (75% exemption on the first S$100k of chargeable income and 50% on the next S$100k), subject to shareholding and tax residency conditions.

  • Mistake 3: Underestimating “Non-Deductible Expenses”

    • Private car expenses and “S” plated vehicle costs are never tax-deductible, even if used for business.

4. Missed the Deadline? Here is What Happens.

If you fail to file by November 30:

  1. Estimated Notice of Assessment (NOA): IRAS may issue an estimation of your tax based on past years (often much higher than actual).

  2. Penalties: Composition amounts can be up to S$5,000 per offence, depending on your company’s past compliance record.

  3. Court Summons: Persistent non-filing leads to court action.

Need Help Filing Last Minute?

If you are struggling to prepare your tax computation or unsure if you qualify for the $2,000 Cash Grant, do not guess.

At Excellence Singapore, our Accounting & Taxation Team can help you review your computation and ensure you file correctly before the portal closes.

Contact Us Immediately for Urgent Filing Assistance

Lucas Seah, CEO & Founder, Excellence Singapore Group

CA (Singapore) · ASEAN CPA · Accredited Tax Practitioner (Income Tax & GST) · EMBA · CEI-Certified MOM-Registered Employment Agency Key Appointment Holder

Lucas founded Excellence Singapore in 2013 and has guided 4,000+ SMEs through incorporation, accounting, tax, corporate secretarial, work passes, trademark and intellectual property, and corporate finance matters. A Chartered Accountant (Singapore) and Accredited Tax Practitioner, he is also the MOM-registered, CEI-certified Key Appointment Holder for the group’s employment agency, which holds a Comprehensive Licence (All) under EA Licence 16C7944. He writes on Singapore business compliance, tax, immigration and corporate strategy.