The 17% rate applies to chargeable income, not revenue
Singapore taxes companies at a flat rate of 17% on chargeable income, which is assessable income minus allowable deductions. That distinction matters. Revenue, turnover, and gross profit are not what IRAS taxes. The starting point is your net profit for the period, adjusted for items that are not deductible (entertainment, certain capital expenditure) and items that are exempt or separately treated. Both resident and non-resident companies pay the same 17% rate on income sourced in Singapore, and foreign-sourced income is taxable when it is remitted to Singapore. The Inland Revenue Authority of Singapore (IRAS) administers all corporate tax assessments and collections.
Start-up tax exemption cuts the effective rate significantly
For qualifying new companies, Singapore's Start-up Tax Exemption (SUTE) scheme reduces the effective tax rate well below 17% in the first three years of assessment. A fixed percentage of the first tier of chargeable income is fully exempt, and a further percentage of the next tier is partially exempt. The scheme is available to companies incorporated in Singapore that are tax resident here and have no more than 20 shareholders, of whom at least one is an individual holding at least 10% of the shares. Investment holding companies and property development companies are excluded. After the qualifying period, companies move to the Partial Tax Exemption (PTE) scheme, which applies a similar tiered structure to all companies regardless of age.
Partial tax exemption applies once the start-up period ends
The Partial Tax Exemption scheme is the default for established companies that no longer qualify for SUTE. Like SUTE, it exempts a portion of the first tier of chargeable income fully and a further portion partially, with the remainder taxed at 17%. The practical effect is that companies with modest chargeable income pay an effective rate noticeably lower than the headline rate. As chargeable income grows, the exempted tiers become a smaller proportion of the total, and the effective rate converges toward 17%. Understanding which tier your projected income falls into helps with cash flow planning and deciding how much to set aside for tax. Duellix prepares management accounts throughout the year so you are not estimating blind when the ECI deadline arrives.
ECI and Form C filings are the two annual obligations
Every company must file an Estimated Chargeable Income (ECI) with IRAS within three months of its financial year end. This is a projection, not a final assessment, but IRAS uses it to issue a preliminary tax bill. The full tax return follows: companies with revenue above the threshold file Form C, while smaller companies file the simplified Form C-S (or Form C-S Lite for the smallest). The annual deadline for both Form C and Form C-S is 30 November of the year of assessment. Missing the ECI deadline can result in IRAS issuing an estimated assessment, which is typically higher than your actual liability and must be objected to formally. See our dedicated ECI filing guide for the step-by-step process.
Tax residency and foreign income rules affect what is taxable
A company is tax resident in Singapore if its control and management is exercised here, which generally means the board of directors meets and makes decisions in Singapore. Tax residency matters because it determines access to Singapore's tax treaties and the treatment of foreign-sourced income. Foreign dividends, branch profits, and service income remitted to Singapore are taxable unless they qualify for exemption under section 13(8) of the Income Tax Act, which requires the income to have been subject to tax in the source country at a rate of at least 15%. Non-resident companies pay the same 17% on Singapore-sourced income but do not access treaty benefits. If you are incorporating remotely and need a registered director in Singapore to satisfy ACRA requirements, that arrangement also has implications for where control and management is deemed to sit.
The 17% headline rate is only the ceiling; exemptions, deductions, and filing choices determine what a company actually pays.
At a glance
Start-up exemption vs partial tax exemption
Which scheme applies to your company depends on its age and shareholder structure.
| Start-up Tax Exemption (SUTE) | Suits newly incorporated Singapore-resident companies in their first three years of assessment with no more than 20 shareholders, at least one of whom is an individual holding 10% or more.Excludes investment holding and property development companies. |
| Partial Tax Exemption (PTE) | Applies to all other Singapore companies as the default scheme, including those that have graduated from SUTE or that do not qualify for it.No shareholder conditions; available indefinitely. |
Most early-stage Singapore companies start on SUTE and move to PTE automatically after the qualifying period.
How corporate tax filing works, step by step
Close your financial year and prepare accounts
Your corporate tax obligations start with your financial year end. Singapore companies choose their own financial year end at incorporation, and it does not have to be 31 December. Once the year closes, your accounts need to be prepared and reviewed before you can calculate chargeable income. Accurate bookkeeping throughout the year is what makes this step fast rather than painful. Duellix uses Xero for all client bookkeeping, so the numbers are current when the deadline approaches.
Calculate chargeable income and file ECI
Within three months of your financial year end, you must submit your Estimated Chargeable Income to IRAS via myTax Portal. This requires you to estimate your assessable income, apply allowable deductions, and account for any exempt amounts under SUTE or PTE. The ECI does not need to be exact, but a significant underestimate can attract scrutiny. IRAS will issue a Notice of Assessment based on your ECI, and payment is due within one month of that notice unless you opt for GIRO instalments. See the full ECI filing process for details on what to include.
Determine which tax return form applies
The form you file depends on your company's revenue and structure. Form C-S is the simplified return for companies with annual revenue at or below the threshold set by IRAS and that meet certain conditions (no capital allowances carried forward, no losses carried back, no foreign income, among others). Form C-S Lite is available for the smallest qualifying companies. Companies that do not meet Form C-S conditions file the full Form C, which requires more detailed disclosure. Choosing the wrong form is a common error that can delay assessment.
Submit the annual tax return by 30 November
The deadline for both Form C and Form C-S is 30 November of the year of assessment. The year of assessment is the calendar year following your financial year end, so a company with a December financial year end has its year of assessment in the following calendar year. Filing is done through IRAS's myTax Portal. Late filing attracts penalties, and IRAS can issue a summons for persistent non-compliance. Duellix handles the full corporate tax filing process, from preparing the return to submitting it on your behalf.
Respond to IRAS assessments and keep records
After filing, IRAS may issue a revised Notice of Assessment or raise queries on specific items. You have 30 days from the date of the notice to object if you disagree with the assessment. Singapore's tax law requires companies to retain records for at least five years, including invoices, receipts, contracts, and bank statements. Good record-keeping is not just a compliance requirement; it is your defence if IRAS audits a prior year. Duellix maintains organised digital records for all clients through Xero, making retrieval straightforward.
Benefits
Flat rate with no surcharges
Singapore's corporate tax is a single flat rate of 17% with no additional surcharges, surtaxes, or local taxes layered on top. What you calculate is what you owe, which makes planning straightforward compared to jurisdictions with multiple overlapping levies.
Start-up exemption reduces early-year tax
Qualifying new companies benefit from the Start-up Tax Exemption scheme for their first three years of assessment, with a significant portion of chargeable income either fully or partially exempt. The effective rate in early years can be well below the headline 17%, giving startups meaningful breathing room while they grow.
Partial exemption applies to all companies
Even after the start-up period, the Partial Tax Exemption scheme ensures that the first portions of chargeable income are taxed at a reduced effective rate. No company pays 17% on every dollar of profit unless its chargeable income is very large.
Foreign income exemption available
Singapore-resident companies can receive foreign dividends, branch profits, and service income without paying Singapore tax on them, provided the income was taxed in the source country at a rate of at least 15%. This makes Singapore an efficient holding and regional headquarters location for companies with cross-border income streams.
Single-tier tax system eliminates double taxation
Singapore operates a one-tier corporate tax system, meaning that dividends paid to shareholders are not taxed again at the shareholder level. Corporate tax is paid once at the company level, and distributions flow to shareholders tax-free.
How the rules play out in practice
A newly incorporated startup in year one
A company incorporated in Singapore with two individual founders, each holding 50% of the shares, qualifies for the Start-up Tax Exemption scheme from its first year of assessment. In the first three years, a significant portion of chargeable income is either fully or partially exempt, meaning the effective tax rate on modest profits is well below 17%. The founders need to ensure the company files its ECI within three months of the financial year end and submits Form C-S by 30 November. Missing the ECI deadline in year one is a common mistake for first-time founders who underestimate how quickly the three-month window closes.
An established SME beyond the start-up exemption period
Once a company has passed its third year of assessment, it moves to the Partial Tax Exemption scheme. The tiered exemption still reduces the effective rate on the first portions of chargeable income, but the benefit is smaller than under SUTE. For an SME with steady revenue, the practical task is ensuring that all allowable deductions are claimed correctly, including staff costs, office expenses, and capital allowances on equipment. Unclaimed deductions are money left on the table. A company using Duellix for bookkeeping and tax filing has its deductions identified as part of the year-end accounts preparation rather than as an afterthought.
An overseas company remitting foreign income to Singapore
A Singapore-resident company that earns income from a foreign subsidiary may remit dividends to Singapore. Those dividends are taxable in Singapore unless the foreign jurisdiction taxed them at a rate of at least 15% and the income was subject to tax there. If the conditions are met, the remitted income qualifies for exemption under section 13(8). Getting this wrong means paying tax on income that should have been exempt, or claiming an exemption that does not apply. The analysis requires checking the source country's tax rate and the nature of the income, which is why this is a common area for professional advice.
A foreign founder incorporating remotely without relocating
A founder based outside Singapore who incorporates a Singapore private limited company needs at least one locally resident director to satisfy ACRA's requirements. That nominee director arrangement has a knock-on effect on tax residency: if the nominee director is the only director and all real decisions are made abroad, IRAS may not treat the company as Singapore tax resident. Control and management must genuinely be exercised in Singapore for the company to access tax treaties and the foreign income exemption. Founders in this situation should understand the distinction between satisfying ACRA's residency rule and meeting IRAS's tax residency test. You can read more about ACRA's requirements and how they interact with tax residency.
Common questions about corporate tax rates in Singapore
What is the corporate tax rate in Singapore?
Singapore's corporate income tax rate is a flat 17% on chargeable income, which is assessable income minus allowable deductions. Both resident and non-resident companies pay this rate on income sourced in Singapore. The effective rate for many companies is lower because of the Start-up Tax Exemption and Partial Tax Exemption schemes.
What is the difference between Form C and Form C-S?
Form C-S is a simplified tax return available to smaller companies that meet IRAS's qualifying conditions, including an annual revenue at or below the prescribed threshold and no complex tax items such as carried-forward losses or foreign income. Companies that do not qualify file the full Form C, which requires more detailed financial disclosure. Both are due by 30 November of the year of assessment.
When is the ECI filing deadline?
The Estimated Chargeable Income must be filed with IRAS within three months of the company's financial year end. For example, a company with a 31 December financial year end must file its ECI by 31 March of the following year. Missing this deadline can result in IRAS issuing an estimated assessment, which is typically set higher than the actual liability.
Does Singapore tax foreign income received by a Singapore company?
Foreign-sourced income remitted to Singapore is generally taxable, but Singapore-resident companies can claim an exemption under section 13(8) of the Income Tax Act if the income was subject to tax in the source country at a rate of at least 15%. Dividends, branch profits, and service income are the three categories that can qualify. The exemption is not automatic; the company must satisfy the conditions and make the claim in its tax return.
Who qualifies for the Start-up Tax Exemption scheme?
The scheme is available to companies incorporated in Singapore that are tax resident here and have no more than 20 shareholders, at least one of whom is an individual holding at least 10% of the shares. Investment holding companies and property development companies are excluded. The exemption applies for the first three years of assessment.