Singapore’s corporate income tax regime is one of the cleanest, most predictable systems in Asia. The headline rate is a flat 17% under the Income Tax Act 1947, but the effective tax rate (ETR) for most Singapore SMEs is materially lower once the partial exemption, start-up exemption, and various sector incentives are applied. For larger groups, Singapore’s tax certainty, treaty network and absence of capital gains tax remain enduring advantages — although the 2026 introduction of BEPS Pillar Two changes the picture for in-scope MNEs.
This 2026 guide walks through the headline rate, the partial and start-up exemptions, the major tax incentives, the Form C / C-S filing process, ECI, and the OECD Pillar Two regime that now sits on top of the Singapore corporate tax system.
The headline rate
Under Section 43 of the Income Tax Act 1947, the corporate tax rate in Singapore is a flat 17% applied to chargeable income for the Year of Assessment (YA). YA 2026 covers income earned in financial year (FY) 2025 (the basis period). Singapore taxes companies on a preceding-year basis — i.e. the income of FY 2025 is assessed in YA 2026.
17% is the headline rate. The effective rate depends on the partial exemption, start-up exemption, available rebates and any sector incentives in play.
Partial Tax Exemption (PTE)
The standard PTE applies to all Singapore tax-resident and non-resident companies. From YA 2020 onwards:
- 75% exempt on the first S$10,000 of normal chargeable income;
- 50% exempt on the next S$190,000 of normal chargeable income.
That means up to S$200,000 of normal chargeable income enjoys reduced effective rates. The maximum exemption under PTE is therefore S$102,500 (75% × S$10,000 + 50% × S$190,000), translating to a tax saving of S$17,425 at the 17% rate.
Start-Up Tax Exemption (SUTE)
New Singapore-incorporated companies enjoy a more generous exemption for their first three YAs, provided they:
- Are incorporated in Singapore;
- Are tax-resident in Singapore for that YA;
- Have no more than 20 shareholders, none of which is a corporation (or one individual holds at least 10% of ordinary shares).
Investment holding companies and property development companies are excluded from SUTE. Where eligible, the SUTE provides:
- 75% exempt on the first S$100,000 of normal chargeable income;
- 50% exempt on the next S$100,000 of normal chargeable income.
Maximum exemption is S$125,000 (saving S$21,250 in tax) — meaningful for a young company.
Corporate Income Tax (CIT) Rebate
From time to time, the Singapore government introduces a CIT rebate in the Budget. For YA 2024 a 50% CIT rebate (capped at S$40,000) was introduced; YA 2025 continued the support with smaller amounts. For YA 2026, check IRAS for the current applicable rebate — Budget 2026 announcements determine the figure. The rebate is applied after PTE/SUTE but before any foreign tax credits.
What income is taxable?
Singapore taxes companies on a territorial-plus-remittance basis. Section 10 of the Income Tax Act brings into charge:
- Income accruing in or derived from Singapore (i.e. Singapore-source income), and
- Income received in Singapore from outside Singapore.
The remittance basis is qualified by the foreign-sourced income exemption under Section 13(8), which exempts foreign-sourced dividends, branch profits and service income remitted to Singapore where:
- The income was subject to tax in the foreign jurisdiction;
- The foreign jurisdiction’s headline tax rate at the time of remittance is at least 15%; and
- The Comptroller is satisfied that the exemption would be beneficial to the resident.
See our deep-dive on Foreign-Sourced Income Exemption (FSIE) Singapore 2026.
Note: Singapore does not tax capital gains. Section 13Z provides a safe-harbour for gains on disposal of equity investments under specified conditions — see our Section 13Z guide.
Common deductions and capital allowances
Section 14 sets out the general rule: expenses wholly and exclusively incurred in producing income are deductible. The standard categories include:
- Staff costs (salaries, CPF, bonuses);
- Rent and utilities;
- Marketing and selling expenses;
- Bank charges and interest (subject to anti-abuse rules);
- Professional fees;
- Repairs and maintenance.
For capital expenditure on plant and machinery, capital allowances are claimed under Section 19 or Section 19A — see Section 19A Capital Allowances Singapore 2026. For renovations and refurbishments, Section 14Q allows a 3-year straight-line deduction — see Section 14Q guide.
Donations to approved IPCs get an enhanced 250% deduction under Section 37(3) — see our Approved Donations Singapore guide.
Major tax incentives
Singapore offers an extensive array of tax incentives, most administered jointly by IRAS and the Economic Development Board (EDB) or Enterprise Singapore. Headline incentives include:
| Incentive | Rate | Target |
|---|---|---|
| Pioneer Certificate Incentive (PCI) | 0% on qualifying income, 5–15 years | Strategic new industries |
| Development & Expansion Incentive (DEI) | 5% or 10% concessionary | Established companies expanding |
| Section 13O / 13U | 0% on specified income | VCCs and family office funds |
| Section 13H | 0% on certain VC fund income | VC fund managers |
| Section 13A / 13E | Tonnage tax / shipping exemption | Shipping companies |
| Section 19B | Writing down allowance | IP acquisitions |
| Enterprise Innovation Scheme (EIS) | 400% deduction (capped) | R&D and innovation |
| Global Trader Programme (GTP) | 5% / 10% concessionary | Commodity traders |
| Regional HQ (RHQ) / IHQ | 5% / 10% concessionary | Regional headquarters |
Most incentives require pre-approval (with conditions on local headcount, business spend, intellectual property domiciled in Singapore, etc.). Many are time-limited and reviewed at renewal.
The Form C / C-S filing process
Estimated Chargeable Income (ECI)
Within 3 months of the company’s financial year-end, the company must file the ECI — its best estimate of taxable profit. Where revenue is below S$5 million and ECI is nil, ECI filing is waived. Otherwise, ECI is filed online via the IRAS myTax Portal. IRAS uses ECI to set instalment payments (up to 12 monthly instalments via GIRO).
Form C-S (Lite) and Form C-S
For YA 2026 onwards:
- Form C-S (Lite): simplified return for companies with revenue ≤ S$200,000 and otherwise eligible for Form C-S — minimal disclosure;
- Form C-S: simplified return for companies with revenue ≤ S$5m, derives only Singapore-source income at standard rates;
- Form C: full corporate tax return for everyone else.
The filing deadline is 30 November of the YA. Late filing attracts composition fees (typically S$200–S$1,000) and, if persistent, can lead to estimated assessments.
Required attachments
Form C requires the company to attach financial statements, tax computation and supporting schedules. Form C-S only requires the tax computation, though IRAS may request the underlying FS. All filings are electronic via myTax Portal; CorpPass authentication is required — see CorpPass Singapore 2026 guide.
Withholding tax
Payments to non-residents for services performed in Singapore, royalties, interest, rental of moveable property and certain other categories attract Singapore withholding tax under Section 45 of the ITA. Treaty relief is available where Singapore has a DTA with the recipient’s country. See our Singapore Withholding Tax 2026 guide.
Transfer pricing
Companies that transact with related parties cross-border are subject to Section 34D of the ITA. Where the company’s gross revenue exceeds S$10 million, transfer pricing documentation is mandatory — see our Singapore Transfer Pricing Documentation (TPD) 2026 guide.
Group relief and loss carry-back
Singapore allows current-year losses to be transferred between Singapore group companies under Section 37B (group relief) — see our Group Relief Singapore guide. Companies can also carry losses forward indefinitely (subject to the shareholding test) and carry back up to S$100,000 of losses by one YA.
BEPS Pillar Two (in-scope MNEs only)
From financial years beginning on or after 1 January 2025, Singapore implements the OECD’s Income Inclusion Rule (IIR) and a Domestic Top-up Tax (DTT) as part of its BEPS Pillar Two regime. The DTT applies to in-scope MNE groups — those with consolidated annual revenue of at least €750 million in two of the four preceding financial years. The DTT operates to bring the effective tax rate of every constituent entity in the group up to 15% in each jurisdiction. The result is that MNEs benefiting from low-rate incentives in Singapore (e.g. 5% under DEI) may have those rates effectively topped up to 15% on the Singapore side via the DTT, rather than being topped up in the parent jurisdiction.
For most SMEs and family businesses, Pillar Two does not apply. For MNEs in scope, the entire incentive landscape needs rethinking — the historic benefit of low concessionary rates is, for in-scope groups, largely neutralised. See IRAS’s published guidance at iras.gov.sg for the latest implementation details.
Tax administration timeline
| When | What |
|---|---|
| FY end (e.g. 31 Dec) | Books close |
| FY end + 3 months | ECI filed via myTax Portal (if not waived) |
| FY end + 4–11 months | Instalment payments via GIRO |
| 30 November of YA | Form C / C-S / C-S Lite deadline |
| 30 days after NOA | Final tax payment |
| 5 years from YA | IRAS retention period |
The annual tax compliance file
A clean Singapore corporate tax file at the end of each YA should contain:
- Audited (or unaudited where exempt) financial statements;
- Tax computation;
- Schedules supporting key adjustments (capital allowances, deductible expenses, foreign tax credit claims);
- ECI submission acknowledgement;
- Form C / C-S submission acknowledgement;
- Notice of Assessment from IRAS;
- Payment evidence (GIRO statements);
- Any correspondence with IRAS during the YA.
Common mistakes
- Missing the ECI deadline (3 months from FY end) where it is not waived;
- Claiming Section 13(8) exemption without checking the foreign-jurisdiction headline rate test;
- Forgetting to apply for the start-up exemption in the first 3 YAs;
- Claiming non-deductible expenses (entertainment without business nexus, fines, etc.);
- Forgetting transfer pricing documentation when revenue crosses S$10m;
- Misclassifying capital expenditure as revenue expense;
- Late payment of tax instalments — interest accrues at 5% per month.
Conclusion
Singapore corporate tax is straightforward in headline terms — 17% flat — but the effective rate that actually applies depends on the partial exemption, start-up exemption, sector incentives, and (for MNEs) the Pillar Two top-up. Getting the basics right (timely ECI, accurate tax computation, complete deductions, on-time Form C / C-S) is the foundation. Layering on incentives where eligible is where the real tax planning lives.
Raffles Corporate Services handles corporate tax compliance for clients across sectors — from dormant holding companies to operating SMEs and multi-jurisdictional groups. We coordinate with IRAS, manage ECI and Form C / C-S filings, defend audits, and apply for incentives where eligible.
— The Editorial Team, Raffles Corporate Services