- ECI is your company's estimate of its taxable income for the financial year, filed with IRAS.
- Most companies must file within three months of their financial year end (IRAS, as at August 2026).
- You can skip filing only if your annual revenue is not more than $5 million and your ECI is nil. Both must be true.
- Filing ECI isn't a tax bill. IRAS uses it to raise your assessment, and you pay when the Notice of Assessment arrives.
- Miss the filing when it's required, and IRAS estimates your income for you and issues an assessment anyway.
If you’ve just spotted “ECI” in an email from your corporate secretary and wondered what ECI is and whether it’s urgent, you’re in good company. ECI stands for Estimated Chargeable Income: your company’s own estimate of its taxable income for the financial year. Most Singapore companies must file it with IRAS within three months of their financial year end. The relief is that some companies don’t have to file at all, and the test for who’s exempt is refreshingly clear once you see it laid out.
Not sure whether this deadline is yours to worry about, or whether your company is off the hook?
What is ECI, exactly?
ECI is your company’s estimate of its taxable income (its chargeable income) for a financial year, after deducting tax-allowable expenses. You file it with IRAS, which uses the figure to raise an early assessment of the tax you’ll owe. It isn’t your final tax bill, and it isn’t the same as your Form C-S or Form C corporate tax return, which comes later.
This article stays on two questions: what ECI is, and whether you have to file it. If you’d rather hand the job over, an ECI filing service can prepare and submit it for you. For the step-by-step process of doing it yourself, how to file your ECI with IRAS walks you through the portal.
Does your company have to file ECI?
Most Singapore companies do, but not all. IRAS grants an ECI filing waiver to companies that meet two conditions together, and the small word that decides it is “and”.
| ECI filing waiver | You can skip filing only if BOTH are true |
|---|---|
| Condition 1: revenue | Your annual revenue is not more than $5 million for the financial year |
| Condition 2: ECI | Your ECI for the Year of Assessment is nil (that is, $0) |
Both conditions have to hold at the same time. Revenue of $4 million with an ECI of $50,000 means you still file. A nil ECI on revenue of $8 million means you still file. It’s revenue at or below $5 million and a nil ECI, never one or the other (IRAS, as at August 2026). You can check the current rules on IRAS’s ECI filing page directly: iras.gov.sg.
One more thing worth knowing: the waiver is assessed every year, not granted once. A company that stays small this year but crosses either line next year has to file again.
What counts as “annual revenue”?
For this test, revenue means what your business earns from its main activities for the financial year, measured before you take off expenses. It’s your top line, not your profit, which is why a loss-making company can still fall outside the waiver if its revenue sits above $5 million. The precise treatment of one-off items can get technical, so if your revenue is anywhere near the $5 million mark, confirm the details on IRAS’s page before you decide not to file.
When is your ECI due?
Your ECI is due within three months of your financial year end (IRAS, as at August 2026). The deadline moves with your year end, not the calendar, which is exactly why it catches directors out.
Here’s a worked example. Say your financial year ends on 31 December 2026. Count three months forward, and your ECI is due by 31 March 2027. If your year end is 30 June 2026 instead, your ECI is due by 30 September 2026. Same rule, different date. If you’re still setting things up, choosing your financial year end shapes every deadline that follows, ECI included.
TIPWhat if your company is dormant or made a loss?
A loss or a quiet year doesn’t make the filing duty vanish, but it usually shapes the numbers. If your company traded at a loss, your ECI may well be nil, and a nil ECI is one of the two waiver conditions. Whether you can skip filing still depends on the revenue side too.
Dormant companies are treated differently again and may not need to file ECI at all. Dormant status has its own IRAS criteria, though, and it isn’t automatic, so confirm your company’s standing before you assume you can skip the filing. A company that starts earning again can lose the treatment the moment revenue returns.
What happens if you don’t file your ECI?
Skipping ECI when you’re required to file doesn’t make the obligation disappear. IRAS will estimate your company’s income and issue a Notice of Assessment (NOA) based on that estimate (IRAS, as at August 2026). You then have to pay the tax stated in the NOA within one month, even if you believe the estimate is too high.
You can object to an estimated NOA if you disagree, but you’re now working backwards, disputing a figure IRAS chose rather than one you filed. Filing on time keeps the estimate in your own hands.
How does ECI fit with your corporate tax return?
ECI is the early estimate. Your Form C-S or Form C is the full corporate tax return, and it’s filed later, by 30 November each year (IRAS, as at August 2026). Picture ECI as the heads-up and the return as the full accounting.
Both estimate tax against Singapore’s headline corporate tax rate of 17% (IRAS, as at August 2026). For a rough sense of the number before you file, a corporate tax calculator gets you close, and IRAS tax brackets show how the rate and rebates apply. For the wider picture, accounting and taxes in Singapore pull the deadlines together.
In your first year, how does your financial year end affect ECI?
New companies get one decision that quietly sets every future deadline: your first financial year end. Pick it when you incorporate, and your first ECI falls due three months after it. Singapore also allows a longer-than-usual first financial period, which can push your first ECI date further out than a straight twelve months.
Newly incorporated companies tend to have modest revenue and may qualify for the waiver in year one. If you do file, the start-up tax exemption can cut the tax on your first slice of chargeable income, so filing ECI and claiming the exemption often go hand in hand.
How Sleek helps you stay on top of ECI
ECI is a small filing with an easy-to-miss deadline, and the cost of missing it is an estimate you didn’t choose. Sleek’s accountants track your ECI and corporate tax dates, prepare the estimate, and file it with IRAS as part of your accounting plan, so the deadline stops being yours to remember.
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FAQs: What Is ECI? Estimated Chargeable Income Explained for Singapore Directors
What does ECI stand for?
ECI stands for Estimated Chargeable Income. It’s your company’s own estimate of its chargeable (taxable) income for a financial year, filed with IRAS ahead of your full corporate tax return. The word “estimated” matters, because it isn’t your final tax figure.
Do I need to file ECI if my company has no income?
Possibly not. If your annual revenue is not more than $5 million and your ECI is nil, you fall under the ECI filing waiver and don’t need to file. A company IRAS treats as dormant may be excused too, but dormant status has its own criteria, so confirm yours before assuming you can skip it.
Is the ECI waiver automatic, or do I have to claim it?
It’s self-assessed. If you meet both conditions, revenue at or below $5 million and a nil ECI, you simply don’t file. There’s no separate application to submit. Keep your own record of why you qualified in case IRAS asks later.
What's my ECI deadline if my financial year ends on 31 December?
Three months later, so 31 March of the following year. A 31 December 2026 year end gives you a 31 March 2027 ECI deadline. The three-month rule applies whatever your year-end date happens to be (IRAS, as at August 2026).
Does filing ECI mean I have to pay tax straight away?
No. ECI is an estimate IRAS uses to raise an early assessment, not a demand for immediate payment. You pay after IRAS issues your Notice of Assessment, and payment is due within one month of that notice unless you’ve arranged an instalment plan.
Who files ECI, me or my accountant?
Either. A director can file it through IRAS’s myTax Portal, or you can appoint a tax agent or accountant to file on the company’s behalf. Plenty of small companies leave it to whoever handles their books, so nothing slips between “your side” and the accountant’s.
What counts as revenue for the $5 million test?
Revenue here means income from your main business activities for the financial year, measured before expenses. It’s your top line, not your profit, so a company can post a loss and still sit above the $5 million line. If you’re close to the threshold, confirm the details with IRAS.
