- File your ECI within 3 months of your financial year-end
- Submit your corporate income tax return (Form C, C-S, or C-S Lite) by 30 November 2026 via e-filing
- Singapore’s corporate tax rate remains a flat 17%, with strong exemptions for startups and SMEs
- Budget 2026 introduced a 40% CIT Rebate for YA 2026, capped at S$30,000 (automatic, no application needed)
- Active companies with at least one local employee in 2025 also receive a S$1,500 CIT Rebate Cash Grant
- Penalties for late filing start at S$200 and escalate from there
Singapore companies must meet two corporate tax filing deadlines each year. First, file your Estimated Chargeable Income (ECI) within 3 months of your financial year end. Second, submit your Corporate Income Tax Return (Form C, C-S, or C-S Lite) by 30 November 2026 via IRAS myTax Portal.
Singapore’s corporate tax rate is a flat 17%. Most companies pay significantly less after exemptions: new companies can qualify for the Start-Up Tax Exemption (SUTE), while all other qualifying companies benefit from the Partial Tax Exemption (PTE) scheme.
Missing the 30 November corporate tax filing deadline can result in composition fines starting at S$200, rising to S$1,000 for repeat offences, and potential court prosecution for continued non-compliance. All companies must file, including dormant companies with zero revenue.
What is corporate income tax in Singapore?
Corporate income tax (CIT) is levied on the chargeable income of companies incorporated or tax-resident in Singapore, and on foreign companies carrying on a trade or business here.
Singapore uses a territorial tax system. Companies are taxed on income accrued in or derived from Singapore. Foreign-sourced income (dividends, branch profits, service income) is generally exempt when remitted to Singapore, subject to conditions under Section 13(8) of the Income Tax Act.
Corporate tax rates and exemptions (YA 2026)
Singapore’s headline corporate tax rate is a flat 17%, unchanged since YA 2010. Partial exemptions significantly reduce the effective rate for most companies.
Partial Tax Exemption (PTE) for all qualifying companies:
|
Chargeable income |
Exemption |
Effective rate |
|
First S$10,000 |
75% exempt |
4.25% |
|
Next S$190,000 |
50% exempt |
8.5% |
|
Above S$200,000 |
No exemption |
17% |
Start-Up Tax Exemption (SUTE) for newly incorporated companies:
Qualifying new companies can claim SUTE for their first three consecutive YAs:
|
Chargeable income |
Exemption |
Effective rate |
|
First S$100,000 |
75% exempt |
4.25% |
|
Next S$100,000 |
50% exempt |
8.5% |
|
Above S$200,000 |
No exemption |
17% |
Source: IRAS, Tax Exemption Scheme for New Start-Up Companies
SUTE eligibility: “The company must be incorporated in Singapore, be a tax resident for the YA, and have no more than 20 shareholders, all of whom are individuals, or at least one individual holds 10% or more of the issued shares. Investment holding companies and property developers are excluded.”
GST vs corporate tax: A quick note
These are two separate obligations. GST applies if your taxable turnover exceeds S$1 million in 12 months (current GST rate: 9% as of 1 January 2024). GST returns are filed quarterly and governed by the GST Act, not the Income Tax Act. Corporate income tax is based on net profit. GST collected is a liability to IRAS, not income.
New for YA 2026: Budget 2026 CIT Rebate
This is the most important update from the prior version of this blog and affects every Singapore company filing for YA 2026.
40% Corporate Income Tax Rebate
All companies with tax payable for YA 2026 will receive a 40% CIT rebate, capped at S$30,000 per company (combined rebate and cash grant).
S$1,500 CIT Rebate Cash Grant
Active companies that employed at least one local employee (Singapore citizen or permanent resident, with CPF contributions, excluding shareholder-directors) in calendar year 2025 will automatically receive a S$1,500 cash grant, disbursed by Q2 2026.
How the cap works:
- Companies receiving the cash grant: rebate capped at S$28,500, total benefit S$30,000
- Companies without the cash grant: rebate capped at S$30,000
No application is needed. The CIT rebate is automatically applied by IRAS to your YA 2026 tax assessment, and the cash grant is disbursed directly. Do not include either in your ECI submission.
How it stacks with SUTE or PTE:
The CIT rebate is applied after SUTE or PTE exemptions have been calculated. For example, a new company in its first YA with S$200,000 in chargeable income would first benefit from SUTE, resulting in tax payable of S$12,750. The 40% CIT Rebate would then reduce this to S$7,650, an effective tax rate of just 3.8%.
The two filing obligations every company must know
1. Estimated Chargeable Income (ECI)
ECI is your company’s estimated taxable income for the financial year, before deducting capital allowances and losses. IRAS uses it to raise a provisional tax assessment.
Deadline: Within 3 months from the end of your financial year.
Examples:
- FYE 31 Dec 2025 = ECI due 31 Mar 2026
- FYE 31 Mar 2025 = ECI due 30 Jun 2025
- FYE 30 Jun 2025 = ECI due 30 Sep 2025
- FYE 30 Sep 2025 = ECI due 31 Dec 2025
ECI filing exemption: Companies with annual revenue of S$5 million or below whose ECI is nil are not required to file. Verify conditions at iras.gov.sg before assuming the exemption applies to you.
Important: If you miss the 3-month window and a Notice of Assessment has not yet been issued, you can still file ECI, but your company will not be granted instalments for payment of estimated taxes.
2. Corporate income tax return (Form C / C-S / C-S Lite)
|
Form |
Who files it |
Deadline |
|
Form C-S Lite |
Revenue S$200,000 or below, straightforward tax affairs |
30 Nov 2026 |
|
Form C-S |
Revenue S$5 million or below, meets qualifying conditions |
30 Nov 2026 |
|
Form C |
All other companies |
30 Nov 2026 |
Penalties for late or non-filing
|
Offence |
Penalty |
|
Late ECI |
Estimated NOA issued; demand letter; instalment arrangement forfeited |
|
Late tax return, first offence |
S$200 composition fine (typically) |
|
Late tax return, repeat offences |
Up to S$1,000 per offence |
|
Failure to file after demand |
Court summons; fines up to S$1,000; or prosecution under Section 94 of the Income Tax Act |
|
Understatement of income |
5% surcharge on tax undercharged; possible audit |
|
Late payment of tax |
5% penalty on outstanding amount; additional 1% per month up to 12% total |
- Dormant companies are not exempt. If your company had no revenue or activity, you still need to file a nil return unless IRAS has granted a specific waiver or the company has been struck off.
- Directors are personally accountable. Engaging an external accountant or corporate service provider does not transfer the legal obligation. IRAS issues enforcement notices directly to directors when company returns are overdue.
Filing your corporate tax: Steps to follow
- Confirm Corppass access for the director, tax agent, or authorised staff member with “Approver” role (not just Preparer, only an Approver can actually submit)
- Finalise financial statements (audited if required under the Companies Act)
- Complete your tax computation: adjusted income, allowable deductions, capital allowances, and losses.
- Log in to myTax Portal at mytax.iras.gov.sg
- File ECI within 3 months of FYE (if applicable); sign up for GIRO at least 3 weeks before filing if you want instalment payments
- File your tax return (Form C / C-S / C-S Lite) by 30 November 2026
- Pay tax within 30 days of receiving your NOA via GIRO, PayNow, or internet banking
Common deductions and allowances
Revenue deductions:
- Staff salaries and CPF contributions
- Rent and lease expenses
- Interest on business loans
- R&D expenditure (enhanced deductions under Sections 14C and 14D)
Capital allowances:
- Section 19: write-off in equal thirds over 3 years
- Section 19A: accelerated 1-year write-off for qualifying assets
- Section 19B: write-off over the approved working life of the asset
Enterprise Innovation Scheme (EIS):
Businesses can claim 400% tax deductions on up to qualifying thresholds for R&D, IP registration, IP acquisition, training, and innovation projects with partner institutions. From YA 2027 and 2028, AI-related expenditure will be added as a new qualifying activity, with 400% deductions on up to S$50,000 of qualifying AI spend per YA.
Consequences of missing the corporate tax filing deadline in Singapore
For 2026, Singapore companies must file their Corporate Income Tax Return. Form C-S, Form C-S (Lite) or Form C by 30 November 2026. Failure to file the return, together with the required financial statements and tax computation, is an offence.
If your company misses the deadline, IRAS may:
- Issue an estimated Notice of Assessment (NOA) based on previous years’ income or other available information. IRAS may assume an increase in income. The estimated tax must be paid within 1 month of the NOA, even if the company intends to object.
- Impose or offer a composition amount of up to S$5,000 per offence, depending on the company’s compliance record. To avoid prosecution, the company must pay the composition amount and file the overdue return and documents by the stated deadline.
- Issue a Section 65B(3) notice requiring a company director to provide the requested information by the stated due date. Non-compliance may lead to court action.
- Issue a Notice to Attend Court or Summons to the company and/or the persons responsible for running it, including directors, if the return/documents or composition amount are not submitted or paid on time.
- Seek court penalties. On conviction, the company may face a fine of up to S$5,000 per offence. If a director is convicted for failing to comply with a Section 65B(3) notice, the director may face a fine of up to S$10,000, imprisonment of up to 12 months, or both.
- For non-filing for 2 or more years, the company may, on conviction, be ordered to pay a penalty of twice the tax assessed plus a fine of up to S$5,000 per offence.
How Sleek helps you meet your corporate tax filing deadline
Running a business in Singapore means juggling a lot. Corporate tax filing is one obligation you cannot afford to get wrong or leave to the last minute, and for most founders and directors, it is not where they want to be spending their time.
Sleek handles the entire corporate tax compliance cycle for Singapore companies, so you can stay focused on your business.
What we take care of:
- ECI filing — We file your Estimated Chargeable Income with IRAS within 3 months of your financial year end, so you never miss the instalment window
- Form C / C-S / C-S Lite — We determine the correct form for your company, prepare your tax computation, and submit your return well ahead of the 30 November 2026 deadline
- Tax exemption and rebate optimisation — We ensure your company correctly claims the Partial Tax Exemption (PTE) or Start-Up Tax Exemption (SUTE) where eligible, and that the Budget 2026 40% CIT Rebate is applied correctly to your assessment
- Bookkeeping and accounts preparation — Accurate accounts are the foundation of a clean tax return. Our bookkeeping service keeps your records in order year-round, so there are no surprises at filing time
- Assigned accountant — You get a dedicated accountant who knows your company, not a different person every time you reach out
- Corppass and portal management — We handle the myTax Portal setup and filing process end to end, including liaising with IRAS if questions arise
Who we work with:
Whether you are a newly incorporated startup in your first YA, an SME filing Form C-S, or a more established company with complex tax positions requiring Form C, Sleek has a plan that fits.
With transparent pricing, a fully online process, and a Singapore-based team, you get compliance you can rely on without the admin burden.
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FAQs: Corporate Tax Filing Deadlines in Singapore 2026
What is the corporate tax filing deadline in Singapore for 2026?
The deadline to file your corporate income tax return (Form C, C-S, or C-S Lite) is 30 November 2026 via IRAS myTax Portal. Separately, your ECI must be filed within 3 months of your financial year-end, which varies by company. All filings are mandatory and must be done online.
Does my company need to file if it had zero revenue or is dormant?
Yes. Every Singapore-incorporated company must file a corporate income tax return, including dormant companies and those with no revenue. You still need to submit a nil return unless IRAS has granted a specific waiver or your company has been officially struck off via ACRA.
What is the difference between ECI and Form C-S?
ECI is a preliminary estimate of your company’s taxable income, filed within 3 months of your financial year-end. Form C-S is your full annual tax return, due 30 November. They are separate obligations. Filing ECI does not replace or substitute your corporate income tax return.
What is Singapore’s corporate tax rate for YA 2026?
Singapore’s corporate tax rate is a flat 17%. Most companies pay significantly less after applying the Partial Tax Exemption or Start-Up Tax Exemption. For YA 2026, Budget 2026 also provides a 40% CIT Rebate on tax payable, capped at S$30,000, applied automatically by IRAS.
Do I need to apply for the Budget 2026 CIT Rebate?
No. Both the 40% CIT Rebate and the S$1,500 CIT Rebate Cash Grant (for companies with at least one local employee in 2025) are applied automatically by IRAS. Do not include either in your ECI or tax return submission. The cash grant is disbursed by Q2 2026.
Which form should my company file: C, C-S, or C-S Lite?
File Form C-S Lite if your revenue is S$200,000 or below. File Form C-S if revenue is S$5 million or below and you meet the qualifying conditions. File Form C if your revenue exceeds S$5 million or your company has complex tax positions, such as foreign tax credits or loss carry-backs.
Can my company get an extension on the 30 November deadline?
IRAS does not routinely grant individual filing extensions. If you anticipate difficulty meeting the deadline, contact IRAS directly as early as possible. Engaging a tax agent does not automatically extend your deadline, but an experienced agent can help you file accurately and on time without needing one.
