Estimated Chargeable Income, or ECI, is the company’s estimate of its taxable income for a Year of Assessment. It can be considered an estimated tax filing, in advance, before the actual Corporate Income Tax Return (Form C-S, Form C-S (Lite), or Form C) is filed.
Most Singapore companies must file ECI within 3 months after their financial year end. A company may skip the filing only if its annual revenue is S$5 million or less and its ECI is nil, or if it falls within a category that IRAS has specifically exempted.
ECI is not the company’s final tax return and filing it does not complete the tax payment process. If tax is payable, IRAS issues a Notice of Assessment after processing the ECI.
What is Estimated Chargeable Income?
ECI is an estimate of the company’s taxable profits for a financial year.
It starts from the company’s accounting results, with the relevant tax adjustments made for items such as non-taxable income, non-deductible expenses and capital allowances.
The ECI figure should be stated before deducting the exempt amount under the partial tax exemption or start-up tax exemption scheme. IRAS applies the relevant exemption when it calculates the estimated tax.
ECI is filed early in the tax cycle. The company later files Form C-S, Form C-S (Lite) or Form C to report its actual taxable income.
ECI is an estimate, not the final tax return. It allows IRAS to assess the company’s estimated tax earlier, while the full Corporate Income Tax Return is filed later.
Who must file ECI?
Most companies must file ECI within 3 months after their FYE.
This still applies if:
- The company did not receive an ECI filing notification from IRAS
- The company expects little or no tax after exemptions
- The company is newly incorporated but has reached its first ECI filing deadline
- The company intends to file Form C-S, Form C-S (Lite) or Form C later
There are two main exceptions:
- The company qualifies for the ECI filing waiver; or
- The company belongs to a category that IRAS specifically does not require to file ECI.
When does a company qualify for the ECI filing waiver?
The company does not need to file ECI for a YA only when both conditions are met:
- Annual revenue is S$5 million or less for the financial year; and
- ECI is nil for that YA.
| Annual revenue | ECI | Must file? |
|---|---|---|
| S$5 million or less | Nil | No, the waiver applies |
| S$5 million or less | More than nil | Yes |
| More than S$5 million | Nil | Yes, file zero as the ECI amount |
| More than S$5 million | More than nil | Yes |
The company must assess the waiver itself. It does not need to apply to IRAS or ask for approval.
Even if myTax Portal shows the status as “Ready to File”, no filing is required where both waiver conditions are met.
What does “annual revenue” mean for the waiver?
Revenue generally means income from the company’s main business activity.
Separate-source income, such as interest, dividends or rental income that does not arise from the main activity, is generally excluded. For an investment holding company, its investment income is treated as revenue.
Which entities are specifically not required to file?
IRAS also excludes certain specialised entities, including:
- Foreign ship owners or charterers whose local shipping agent submits the Shipping Return
- Foreign universities
- Certain designated or approved unit trusts
- Qualifying real estate investment trusts
- Cases where IRAS has specifically granted an ECI filing waiver
These exclusions do not normally apply to an ordinary Singapore private limited company.
When is the ECI filing deadline?
ECI is due within 3 months after the company’s FYE.
| Financial year end | ECI deadline |
|---|---|
| 31 December | 31 March |
| 31 March | 30 June |
| 30 June | 30 September |
| 30 September | 31 December |
The deadline is based on the FYE, not the annual Form C-S or Form C filing date.
For example, a company with a 31 December 2026 FYE generally files its ECI by 31 March 2027.
Do not wait for an IRAS reminder. If the company does not qualify for the waiver, it must file within 3 months after FYE even if no notification was received.
How is ECI calculated?
ECI is not simply the accounting profit shown in the financial statements.
A basic calculation usually looks like this:
- Start with the accounting profit or loss before tax.
- Remove income that is not taxable or is taxed separately.
- Add back expenses that are not deductible for tax purposes.
- Deduct capital allowances and other allowable tax items.
- Take into account eligible group relief or loss carry-back claims, where applicable.
The result is the estimated taxable income to report as ECI.
Do not deduct the partial tax exemption or start-up tax exemption from the ECI figure. IRAS calculates those exemptions when it processes the filing.
If the accounts are not finalised yet, the company should make a reasonable estimate using the available accounting records. The estimate can be revised later if needed.
How do you file ECI?
ECI is filed through myTax Portal.
Before filing, prepare:
- The company’s UEN
- The financial year end
- Annual revenue
- The estimated taxable income
- Details of any relevant relief claims
The person submitting the filing must be authorised as a Corporate Tax “Approver” in Corppass. A “Preparer” may enter the information but cannot submit it to IRAS.
After filing, save the acknowledgement and check the filing status in myTax Portal.
IRAS provides the current filing steps in its ECI filing guide.
How do the 10, 8 and 6-month GIRO instalments work?
A Singapore-registered company may receive more GIRO instalments when it files its first ECI early.
| First ECI filed within | Maximum GIRO instalments |
|---|---|
| 1 month after FYE | 10 instalments |
| 2 months after FYE | 8 instalments |
| 3 months after FYE | 6 instalments |
| After 3 months | No ECI instalment plan |
To receive the full 10, 8 or 6-month plan, file by the 26th day of the relevant month after FYE.
For a company with a 31 December FYE:
- File by 26 January for up to 10 instalments
- File by 26 February for up to 8 instalments
- File by 26 March for up to 6 instalments
The company must also have an approved Corporate Income Tax GIRO arrangement. The minimum monthly deduction is S$50, and the first few instalments may be combined depending on when the ECI is filed.
Filing ECI early does not automatically create an instalment plan. The company must be Singapore-registered and have an approved GIRO arrangement.
See IRAS’s Corporate Income Tax GIRO guide for the current deduction rules.
What happens after ECI is filed?
If the company files a positive ECI, IRAS processes the filing and issues a Notice of Assessment showing the estimated tax payable.
The tax is generally due within 1 month from the NOA date, unless the company has an approved GIRO instalment plan.
If the company files a nil ECI, IRAS does not issue an ECI NOA because there is no estimated tax to pay at that stage.
The company must still file its annual Corporate Income Tax Return later, unless a separate filing waiver applies. That return is filed using Form C-S, Form C-S (Lite) or Form C.
If the final taxable income differs from the ECI:
- IRAS refunds excess tax paid where the final amount is lower.
- The company pays the additional tax where the final amount is higher.
- IRAS may ask for an explanation where the difference is significant.
Our guide on how to pay Corporate Income Tax explains the NOA, payment methods and payment deadlines.
What is the difference between ECI and Form C-S or Form C?
| ECI | Form C-S, Form C-S (Lite) or Form C |
|---|---|
| An estimate of taxable income | The final Corporate Income Tax Return |
| Due within 3 months after FYE | Generally due by 30 November for the relevant YA |
| May lead to an estimated NOA and early tax payment | Leads to IRAS finalising or revising the tax assessment |
| May be waived if revenue is S$5 million or less and ECI is nil | Has separate filing waiver and eligibility rules |
For the wider tax filing cycle, read our Singapore corporate tax preparation guide.
Can the company revise its ECI?
Yes. If the estimate changes after filing, the company can submit a revised ECI through the “Revise/Object to Assessment” service in myTax Portal.
IRAS may adjust the GIRO plan after a revised ECI is filed. If the revised amount is lower, any excess tax paid is credited or refunded. If it is higher, the company may need to pay the additional amount.
What happens if ECI is filed late or not filed?
If the company is required to file ECI but misses the deadline, IRAS may issue an estimated NOA based on past income or other information available.
The company must then pay the full estimated tax within 1 month from the NOA date. It will not receive the ECI instalment plan.
Payment is still required even if the company objects to the estimated assessment. If IRAS later reduces the assessment, the excess payment is refunded.
The company may still file ECI after the 3-month deadline if IRAS has not yet issued an NOA for that YA, but no instalment plan will be available.
Do not ignore an estimated NOA. Late payment penalties and enforcement action may follow if the amount is not paid by the stated deadline.
ECI filing checklist
- Confirm the company’s FYE.
- Calculate the ECI deadline, which is 3 months after FYE.
- Check whether annual revenue is S$5 million or less.
- Calculate whether ECI is genuinely nil before relying on the waiver.
- Prepare a reasonable tax estimate using the latest accounting records.
- Do not deduct the partial or start-up tax exemption from the ECI figure.
- Check the Corppass Approver access before filing.
- File by the 26th of the relevant month to maximise GIRO instalments.
- Confirm that the GIRO arrangement has been approved.
- Save the filing acknowledgement and review the NOA when issued.
- Revise the ECI if the estimate changes materially.
- File the annual Corporate Income Tax Return later.
Frequently asked questions
What is ECI in Singapore?
ECI is the company’s estimate of its taxable income for a Year of Assessment. It is filed before the final Corporate Income Tax Return.
When is ECI due?
ECI is generally due within 3 months after the company’s financial year end.
Does every company need to file ECI?
Most companies do. A company may skip the filing if its annual revenue is S$5 million or less and its ECI is nil, or if it falls within a category that IRAS specifically does not require to file.
Does a company need to apply for the ECI waiver?
No. The company self-assesses whether both waiver conditions are met. It does not need to apply to IRAS or request confirmation.
If ECI is nil, must the company still file?
It depends on revenue. A company with nil ECI and annual revenue of S$5 million or less does not need to file. If revenue exceeds S$5 million, it must file and report zero as the ECI amount.
Is ECI the same as Form C-S or Form C?
No. ECI is an estimate filed within 3 months after FYE. Form C-S, Form C-S (Lite) or Form C is the final annual Corporate Income Tax Return.
Does filing ECI mean the tax has been paid?
No. If tax is payable, IRAS issues a Notice of Assessment after processing the ECI. Payment generally follows the NOA.
How many GIRO instalments can a company receive?
A Singapore-registered company with approved GIRO may receive up to 10, 8 or 6 instalments if it files its first ECI within 1, 2 or 3 months after FYE respectively.
Can ECI be revised after filing?
Yes. The company can submit a revised ECI through the “Revise/Object to Assessment” service in myTax Portal.
What happens if ECI is filed late?
IRAS may issue an estimated NOA. The full estimated tax is then due within 1 month, and the company will not receive an ECI instalment plan.
Need help preparing and filing ECI?
Leftright Corporate can prepare the company’s tax estimate, file ECI and complete the annual Corporate Income Tax Return based on the final accounts.
See our corporate tax computation and filing service for more information.
