Corporate Tax
Corporate Tax Filing for Singapore Companies
All Singapore-registered companies must file their Corporate Income Tax Return (Form C-S, Form C-S (Lite), or Form C) with IRAS by 30 November each year . Alpha Business Solutions prepares your corporate tax computation, ECI filing, and Form C-S submission, so you meet the deadline and avoid penalties of up to $5,000 .
We’ve helped Singapore-based businesses claim available tax exemptions and file accurately with IRAS since 2009.
Our Corporate Tax Services
ECI Filing (Estimated Chargeable Income)
IRAS requires all companies to file their ECI within three months after their financial year-end. We prepare and submit your return in strict alignment with IRAS ECI filing guidelines, so you qualify for instalment payment options and avoid late filing penalties.
Form C-S / Form C-S (Lite) Preparation
For Singapore-incorporated companies with annual revenue of $5 million or below, Form C-S is the simplified filing option. We evaluate your financials against the IRAS Form C-S qualifying conditions, prepare your tax computation, and submit Form C-S by the 30 November deadline.
Form C Filing (Full Return)
If your company doesn’t qualify for Form C-S or is claiming tax incentives, carrying forward losses, or has complex income. We prepare the full Form C with supporting financial statements and tax computation .
Tax Exemption Claims
We ensure your company claims the Partial Tax Exemption (up to $102,500 exempt) or start-up Tax Exemption (up to $125,000 exempt for first 3 YAs) where eligible . These corporate tax exemptions must be claimed through your ECI and Form C-S filing.
Tax Planning & Advisory
Tax optimisation strategies for Singapore SMEs, including timing of capital allowances, deduction optimisation, and ensuring compliance with IRAS requirements.
Singapore Corporate Tax Calculator YA 2026
Calculations provide an estimated tax payable and effective tax rate based on the FY's latest tax rates and policies, and are not a substitute for advice from IRAS. Speak with our certified corporate accounting specialists to maximise your tax incentives.
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Singapore Corporate Tax: What You Need to Know
ECI (Estimated Chargeable Income)
All companies must file ECI within 3 months after their financial year-end, unless they qualify for the ECI filing waiver . Filing early may qualify you for more instalment payments — the earlier you file, the more instalments you’re allowed.
Form C-S / Form C-S (Lite) / Form C
Your company’s annual Corporate Income Tax Return must be filed by 30 November each year . The form you file depends on your revenue:
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- Form C-S (Lite): Revenue ≤ $200,000. Only 6 essential fields required.
- Form C-S: Revenue ≤ $5 million, simplified return.
- Form C: For companies not qualifying for Form C-S or claiming tax incentives
Corporate Tax Rate
Singapore’s corporate income tax rate is a flat 17% . However, Partial Tax Exemption significantly reduces effective rates for SMEs:
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- 75% exemption on first $10,000 chargeable income
- 50% exemption on next $190,000 chargeable income
- Maximum exemption: $102,500 per year
GST (Goods and Services Tax)
GST is charged on the supply of goods and services in Singapore. The current rate is 9%. Your business must register for GST if your annual turnover exceeds or is likely to exceed $1 million from the sale of taxable goods and services.
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