Singapore corporate tax filing: an overview for company owners

Short answer: Singapore companies generally file Estimated Chargeable Income (ECI) within three months after the financial year end, unless they qualify for the ECI filing waiver, and file an annual corporate income tax return (Form C-S, Form C-S (Lite) or Form C) by 30 November each year.

Key filings

Filing	What it is	General timing
Estimated Chargeable Income (ECI)	An estimate of the company's taxable income for the year of assessment	Within 3 months after financial year end, unless the waiver applies (annual revenue of S$5 million or below and ECI of nil)
Form C-S / Form C-S (Lite)	Simplified return for smaller companies that meet IRAS qualifying conditions	By 30 November
Form C	Full corporate income tax return for companies that do not qualify for Form C-S	By 30 November

What to prepare

Financial statements for the financial year
A tax computation that adjusts accounting profit for tax purposes
Schedules for capital allowances, donations and other claims
Details of any grants, incentives and exempt income
Records supporting related-party and overseas transactions

Good practice

Close the accounts early so that there is time to prepare the computation carefully
Keep supporting documents for the period required by IRAS
Check that the person filing has the right CorpPass authorisation
Reply to IRAS queries by the stated deadline, and ask for more time if needed

What IRAS decides

Companies self-report. IRAS reviews returns, may raise queries and issues the assessment. An adviser can help prepare accurate returns, but cannot guarantee a particular tax outcome.

Official sources

This article is general information based on requirements as understood at the date of review. Rules change, and individual circumstances differ. It is not legal, tax or accounting advice. Please check the official sources or contact us about your situation.