IRAS has issued guidance for Corporate Income Tax Filing Season 2026, setting the filing deadline at 30 November 2026 via myTax Portal. Filing opens on 5 May 2026.
The Inland Revenue Authority of Singapore (IRAS) has released updated guidance for the Corporate Income Tax Filing Season 2026, setting the filing deadline for the Year of Assessment (YA) 2024 Corporate Income Tax Return (Form C-S/ Form C-S (Lite)/ Form C) at 30 November 2026. Filing became available from 5 May 2026.
For YA 2026, IRAS confirmed that all companies must file their Corporate Income Tax Return by 30 November 2026, including companies that did not carry on business or incurred losses in the 2025 financial year, unless a specific waiver has been granted.
Filing forms and eligibility
Companies are required to file using different forms depending on eligibility:
- Form C-S: For Singapore-incorporated companies with annual revenue of SGD 5 million or below, deriving income taxed at the 17% corporate tax rate and not claiming complex reliefs such as group relief or foreign tax credits.
- Form C-S (Lite): For companies eligible for Form C-S with annual revenue of SGD 200,000 or below.
- Form C: For companies not meeting simplified criteria; requires submission of financial statements and tax computations.
- Dormant company form: For companies with no business activity and no income during the financial year.
Filing requirements and procedures
IRAS stated that companies must ensure proper Corppass authorisation, with an “Approver” assigned for the Corporate Tax (Filing and Application) digital service before submission.
Companies filing Form C-S may use #SeamlessFilingFromSoftware (#SFFS) to automate preparation and filing directly from accounting systems.
Directors remain legally responsible for accurate and timely filing, even if a tax agent is appointed. Late or non-filing may result in penalties of up to SGD 5,000.
Tax computation and compliance
Taxable income includes gains from trade or business, investment income such as dividends, interest, rental income, and royalties. Income is taxable if accrued in or derived from Singapore, or received in Singapore from abroad.
Deductible expenses must be incurred “wholly and exclusively” in the production of income. IRAS also cautioned against common errors, including claims for non-deductible expenses and underreporting income due to poor record-keeping.
Assessment, objections and payment
Filing and assessment status can be checked via the myTax Portal or the IRAS Bot within three working days after submission. Following review, IRAS will issue a Notice of Assessment (NOA).
Any objections or revisions must be submitted within two months of the NOA date. Tax payment is due within one month of the NOA date, regardless of whether an objection is filed. GIRO remains the preferred payment method, with refunds processed automatically within 30 days via GIRO or PayNow Corporate.
