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Ask an accountantWorked example: December year-end company
A company with a 31 December 2026 year-end, revenue of S$3 million and estimated chargeable income of S$250,000.
| ECI filing due | 31 March 2027 |
| Estimated tax (YA2027, no rebate announced) | S$25,075 |
| Instalments if filed in the first month | 10 |
File earlier to spread the tax over more monthly GIRO instalments.
Common questions
When is ECI due?
Within 3 months of the end of the financial year, for example by 31 March for a 31 December year end.
Who does not need to file ECI?
A company whose revenue for the year is S$5 million or less and whose estimated chargeable income is nil.
Why file early?
Companies paying by GIRO get more interest-free instalments the earlier they file: up to 10 if filed within a month of the year end.
Read the guide
For education only. Instalment counts depend on GIRO and filing date; check your IRAS notice. Not tax advice.