Singapore’s corporate tax is straightforward on paper — one flat rate, a preceding-year basis, and a handful of well-signposted deadlines. The complexity is in the reliefs: get the exemptions and the YA 2026 rebate right and a profitable small company can pay a fraction of the headline rate. This guide sets out the rate, how a Pte Ltd is assessed, the exemptions and rebate, the filing deadlines, and what happens if you miss them.

Singapore corporate tax at a glance: the flat 17% rate

Singapore taxes company profits at a flat 17% of chargeable income, and the same rate applies to local and foreign-owned companies alike. There are no separate small-company or higher-earner brackets — the rate is the same whether you make S$50,000 or S$50 million.

“Chargeable income” is your income after deducting allowable business expenses, capital allowances and reliefs, but before applying the tax exemption schemes and any rebate. Because those exemptions and the current rebate come off the top, the effective rate most small companies actually pay is well under 17%. The sections below show how.

How a Pte Ltd is assessed: basis period and Year of Assessment explained

A Singapore company is taxed on the preceding year’s profits: income earned in financial year 2025 is assessed in Year of Assessment (YA) 2026. IRAS assesses tax on a preceding-year basis, so there is always a lag between when you earn profit and when you are taxed on it.

The financial year that produced the income is called the basis period, and it is generally the 12 months ending in the year before the YA. If your financial year ends on 31 December 2025, that 12-month period is the basis period for YA 2026. Your financial year-end (FYE) is what drives every deadline in this guide, so it is worth fixing it deliberately when you incorporate a Singapore Pte Ltd as a foreigner or set up a local company.

Start-Up Tax Exemption (SUTE): 75% off your first S$100,000 of profit

A qualifying new company pays tax on only a quarter of its first S$100,000 of chargeable income for each of its first three YAs. Under the Start-Up Tax Exemption (SUTE), 75% of the first S$100,000 is exempt and a further 50% of the next S$100,000 is exempt — a maximum of S$125,000 of exempt income per YA (S$75,000 + S$50,000). The scheme sits under Section 43 of the Income Tax Act 1947 and runs for the company’s first three consecutive YAs.

SUTE is not automatic for every start-up. To qualify, the company must:

• be incorporated in Singapore and be a Singapore tax resident for that YA; and
• have total share capital beneficially held directly by no more than 20 shareholders throughout the basis period, where either all shareholders are individuals, or at least one individual shareholder holds at least 10% of the issued ordinary shares.

Two types of company are excluded: those whose principal activity is investment holding, and those that undertake property development for sale, investment, or both. From the fourth YA onwards, a former start-up moves to the Partial Tax Exemption below.

Partial Tax Exemption: the default relief from your fourth YA onwards

From its fourth Year of Assessment — or from day one if it does not qualify for SUTE — a company falls under Partial Tax Exemption (PTE), which shelters up to S$102,500 of chargeable income each year. PTE exempts 75% of the first S$10,000 of normal chargeable income and 50% of the next S$190,000, giving a maximum exempt amount of S$102,500 per YA (S$7,500 + S$95,000).

PTE is available to all companies, including companies limited by guarantee, unless they are claiming SUTE. The table below sets the two schemes side by side.

YA 2026 bonus: the 50% CIT rebate and S$2,000 cash grant (automatic)

For Year of Assessment 2026, IRAS automatically applies a 50% corporate income tax rebate, capped at S$40,000, and pays eligible active companies a S$2,000 cash grant. The rebate is calculated on the corporate tax payable, and the combined maximum benefit — rebate plus cash grant — is S$40,000 per company.

The S$2,000 CIT Rebate Cash Grant goes to any active company that made CPF contributions to at least one local (Singapore citizen or permanent resident) employee during calendar year 2025, excluding shareholder-directors. Both the rebate and the grant are worked out and applied by IRAS — you must not deduct them yourself in your ECI or Form C-S/C figures. The cash grant is not taxable, and it appears only in your final Notice of Assessment, not in the ECI acknowledgement.

For context, Budget 2026 originally set the rebate at 40% (with a combined cap of S$30,000 and a minimum S$1,500 cash grant). The Government has since enhanced the figures for YA 2026 to the 50% rebate, S$40,000 combined cap and S$2,000 grant described above, announced as further support to help companies manage cashflow amid higher energy costs. The enhanced figures are the ones that apply for YA 2026.

ECI filing: the 3-month deadline, the waiver, and why filing early pays

Estimated Chargeable Income (ECI) must be filed within three months of your financial year-end, unless your revenue is S$5 million or below for the financial year and your ECI is nil. Where both waiver conditions are met, you do not need to file, and you do not need to inform or seek confirmation from IRAS — even if myTax Portal shows a “Ready to File” status. For the waiver, ECI is measured before deducting the SUTE or PTE exempt amounts.

Filing ECI early also buys you a longer instalment plan. Companies on GIRO get more monthly instalments the sooner they file, as long as they file by the 26th of the qualifying month (minimum monthly deduction S$50).

Form C-S, C-S (Lite) or Form C: which annual return you file by 30 November

By 30 November every year, your company must file one corporate tax return — Form C-S, Form C-S (Lite) or Form C — even if it made a loss or had no income. The deadline gives companies at least 11 months from the close of accounts, and IRAS issues the filing notification by May each year. Which form you use depends on your revenue and the reliefs you are claiming.

Even if you file Form C-S or C-S (Lite) without attaching financial statements, you must prepare them and hand them over if IRAS asks.

Every corporate tax deadline in one table

Here are the corporate tax deadlines every Singapore company should diarise. Dates are driven by your financial year-end and the date on your Notice of Assessment.

Dormant companies are not exempt from filing: they must still e-file the Form for Dormant Company unless IRAS has granted a waiver of return submission. Tax deadlines run alongside your ACRA obligations, so it helps to map them together — see our note on ACRA annual return deadlines.

A new company’s first-year tax timeline (worked example)

A company incorporated part-way through a year files its first ECI in the year after incorporation, and may have to split its opening profits across two YAs. New companies receive their first ECI filing notification in the year after incorporation, and if the first set of accounts covers more than 12 months, profits are attributed across two YAs (time apportionment is allowed).

IRAS’s own example makes this concrete. A company incorporated on 15 July 2023 with a December financial year-end closes its first set of accounts on 31 December 2024 — a period of more than 12 months. Because the accounts span two YAs, the company files its YA 2024 and YA 2025 ECI together, by 31 March 2025. Choosing a first FYE within 12 months of incorporation avoids this two-YA split and keeps the first-year timeline simpler.

Single-tier dividends and what expenses you can deduct

Dividends paid by a Singapore tax-resident company are tax-free in your shareholders’ hands, because tax is settled once at company level under the one-tier system. The tax the company pays on its profits is final, so shareholders — in a private company or an SGX-listed one — receive dividends without a further tax charge. The main exception is dividends from co-operatives.

On the expense side, a deduction is allowed only where the cost is “wholly and exclusively incurred in the production of income”. In practice that means the expense must be incurred solely to produce income, must have actually been incurred (a legal liability has arisen), must be revenue rather than capital in nature, and must not be prohibited under the Income Tax Act 1947.

• Typically deductible: accounting fees, general administrative expenses, advertising, and bad trade debts.
• Not deductible: amortisation, company incorporation expenses, private or personal expenses, and the purchase of fixed assets — for capital assets you claim capital allowances instead.

Note that GST is a separate tax from corporate income tax; if your taxable turnover approaches S$1 million, read our GST registration guide.

Miss a deadline? Penalties, composition and how to put it right

Filing your return late, or not at all, is an offence that can lead to an estimated tax bill, a composition sum of up to S$5,000, and prosecution. Where a company fails to file by 30 November, IRAS may:

• issue an estimated Notice of Assessment — the estimated tax is payable within one month even if you intend to object (the objection window is two months);
• offer to compound the offence for up to S$5,000 per offence, depending on the company’s past compliance;
• issue a notice to the directors under Section 65B(3); and
• issue a Notice to Attend Court or a Summons to the company and/or its directors — on conviction, the court may impose a fine of up to S$5,000 per offence.

The composition sum and the fine on conviction are separate consequences that happen to share the same S$5,000 ceiling. IRAS will only consider an appeal to waive a composition amount if the company has filed its returns on time for the past two years.

Late payment carries its own penalties. Tax is due one month from the date of the Notice of Assessment, and it remains payable even while an objection is pending. Miss that date and a 5% late-payment penalty applies to the unpaid tax; if the tax is still unpaid 60 days after the 5% penalty, an additional 1% per completed month may be added, up to a maximum additional 12%. If you have fallen behind, filing the outstanding returns and settling the tax quickly is the fastest way to limit the penalties — a steady corporate secretarial retainer keeps these dates from slipping in the first place.

Sources and further reading

• IRAS — Corporate income tax rate, rebates and tax exemption schemes
• IRAS — Estimated Chargeable Income (ECI) filing
• IRAS — Overview of Form C-S / Form C-S (Lite) / Form C
• IRAS — Basic guide to corporate income tax for companies
• IRAS — Late filing or non-filing of corporate income tax returns
• IRAS — Late payment or non-payment of corporate income tax
• IRAS — Dividends and the one-tier system
• IRAS — Business expenses and deductions
• Asprin — Incorporate a Singapore Pte Ltd as a foreigner
• Asprin — Corporate secretarial retainers