Small Business Tax in Singapore

Singapore offers one of the most competitive small-business tax environments in Asia-Pacific. The Inland Revenue Authority of Singapore (IRAS) administers a flat 17% corporate income tax rate under the Income Tax Act 1947, while layered exemption schemes sharply reduce effective rates for smaller companies during their early years. Sole proprietors and partnerships are taxed differently, flowing through to the owner's personal income tax return. Understanding which regime applies to your structure is the starting point for any Singapore business owner.

What is the Singapore corporate income tax rate?

Singapore applies a flat 17% corporate income tax (CIT) rate to a company's net chargeable income -- the rate has not changed since 2010. [1] The rate applies uniformly to Singapore-sourced trading income and qualifying foreign-sourced income received in Singapore. There is no separate small-company rate; the flat structure means the exemption schemes below do all the work of reducing effective rates for SMEs. For the Singapore country overview, this competitive headline rate, combined with an extensive tax-treaty network (over 90 treaties), makes Singapore a widely used regional holding and operating hub.

How does the Start-Up Tax Exemption work?

For qualifying new companies, IRAS grants the Start-Up Tax Exemption (SUTE) for each of the first three consecutive Years of Assessment (YAs). [1] The exemption applies to normal chargeable income: 75% of the first SGD 100,000 is exempt, and 50% of the next SGD 100,000 is exempt -- a maximum exemption of SGD 125,000 per YA. Tax is then charged at 17% only on the remaining (taxable) portion and on all income above SGD 200,000. To qualify, a company must be: (a) incorporated in Singapore; (b) Singapore tax-resident for that YA (control and management exercised in Singapore); (c) held by no more than 20 shareholders throughout the basis period; and (d) have at least one individual shareholder holding a minimum 10% of issued ordinary shares. [2] Companies whose principal activity is investment holding, or that undertake property development for sale or investment, are excluded.

How does the Partial Tax Exemption work?

Once a company's SUTE window closes -- or for any company that does not qualify for SUTE -- the Partial Tax Exemption (PTE) applies. [1] The PTE provides: 75% exemption on the first SGD 10,000 of normal chargeable income, and 50% exemption on the next SGD 190,000. The maximum exemption under PTE is SGD 102,500 per YA. Income above SGD 200,000 is taxed at the full 17%. On the first SGD 200,000, the blended effective rate under PTE works out to approximately 8.3%, significantly below the headline rate. Both SUTE and PTE apply to normal chargeable income; neither applies to income taxed at concessionary rates under special incentive schemes.

How are sole proprietors and partnerships taxed?

Sole proprietors and partnerships are not subject to corporate income tax. Instead, the net trade income flows through to each owner's personal income tax return and is taxed at the individual's marginal rate. [3] Singapore's resident individual income tax rates are progressive, ranging from 0% on the first SGD 20,000 of chargeable income to 24% on income exceeding SGD 1,000,000. Mid-range brackets include 7% on income between SGD 40,000 and SGD 80,000, and 11.5% on income between SGD 80,000 and SGD 120,000. Owners may deduct allowable business expenses, personal reliefs, and approved donations before computing taxable income. There is no equivalent of the SUTE or PTE for unincorporated structures; owners in profitable sole proprietorships often consider incorporation once net trade income consistently exceeds the PTE-shielded SGD 200,000 band.

When does GST registration become compulsory?

Goods and Services Tax (GST) at 9% applies to standard-rated supplies of goods and services in Singapore. The rate increased from 8% to 9% with effect from 1 January 2024. [4] A business must register for GST when its taxable turnover for the calendar year (1 January to 31 December) exceeds SGD 1 million -- this is the retrospective-view threshold. Under the prospective view, registration is also required when a business reasonably expects taxable turnover to exceed SGD 1 million in the next 12 months. Once registered, businesses charge 9% GST on taxable supplies, claim input tax credits on qualifying business purchases, and file GST returns (typically quarterly) via the IRAS myTax Portal. Voluntary registration is available for businesses below the threshold, which can be advantageous when input credits would otherwise be irrecoverable.

What is Estimated Chargeable Income (ECI) and when is it due?

All Singapore companies must file Estimated Chargeable Income (ECI) -- a preliminary estimate of the company's taxable income -- within three months of the end of their financial year. [5] For example, a company with a 31 December financial year end must file ECI by 31 March of the following year. ECI triggers instalment payment arrangements for the estimated tax; companies that file late lose the right to pay by instalments. A company is exempt from ECI filing if it meets both of the following: annual revenue is no more than SGD 5 million for the financial year, and ECI is nil for that YA. After ECI, companies file their full corporate income tax return -- Form C-S (for companies with annual revenue of SGD 5 million or below, meeting simplified criteria) or Form C (for all other companies) -- by 30 November following the YA. Consulting a qualified tax professional before the ECI deadline helps ensure the estimate is accurate and avoids instalment loss.

What is the YA 2026 corporate income tax rebate?

As announced in Singapore Budget 2026 and subsequently enhanced in April 2026, all taxpaying companies receive a CIT Rebate of 50% of their corporate income tax payable for YA 2026, capped at a total benefit of SGD 40,000. [1] Active companies that employed at least one local employee in 2025 also receive a minimum CIT Rebate Cash Grant of SGD 2,000 -- payable even if the company's tax payable is nil. IRAS computes and applies the CIT Rebate automatically based on the ECI or tax return filed; no separate application is required. The rebate provides meaningful cash-flow relief for profitable SMEs: a company with SGD 50,000 of net CIT payable (after PTE exemption) would receive a SGD 25,000 rebate, reducing the actual payment to SGD 25,000. For a Singapore country overview of all major taxes, including stamp duty, property tax, and withholding tax, see the jurisdiction index.

For complex questions -- such as SUTE eligibility analysis, ECI computation, GST registration timing, or assessing whether incorporation makes sense relative to sole-proprietor personal rates -- the right next step is to consult a qualified tax professional who practises in Singapore corporate and business taxation.