The Inland Revenue Authority of Singapore (IRAS) has launched e-filing services for Form C, Form C‑S, and Form C‑S (Lite) for the Year of Assessment (YA) 2026 on mytax.iras.gov.sg. Companies must file by 30 November 2026. Businesses seeking an Enterprise Innovation Scheme (EIS) cash payout for YA 2026 must submit their applications electronically through the same portal after filing their corporate income tax return.
Key Impacts
Corporate tax compliance: All companies must complete their e-filing obligations for YA 2026 through the designated IRAS system by the deadline. Failure to do so may result in penalties or forfeited claims.
Integration with innovation incentives: The EIS cash payout process is now linked directly to corporate tax filings. Businesses must submit their income tax returns before accessing the EIS application function.
Streamlined digital processes: IRAS continues to enhance compliance infrastructure through full digitisation, reinforcing expectations of timely and accurate electronic submissions.
Practical Issues
System readiness: Tax departments and service providers should ensure access to mytax.iras.gov.sg and verify that authorised personnel have up‑to‑date logins and digital credentials.
Sequencing of actions: The EIS cash payout application can only be made after the corporate return submission, requiring careful scheduling to meet the 30 November 2026 deadline.
Documentation alignment: Supporting documentation for innovation-related expenditure should be prepared early to facilitate both tax filing and EIS application review.
Process controls: Internal workflows may need updating to align financial reporting and corporate tax compliance with electronic filing and innovation incentive claims.
Recommended Actions
Review corporate tax records and ensure completeness well before the filing deadline.
Identify any qualifying innovation expenditures intended for EIS claims and compile supporting evidence.
Coordinate with internal finance teams or tax advisers to submit both the corporate return and EIS application on time using the correct mytax.iras.gov.sg services.
IRAS’s 2026 filing cycle reinforces Singapore’s continued move toward integrated, digital-first tax compliance — a trend requiring proactive planning and system readiness from corporate taxpayers.
Source: IRAS website, 4 May 2026