Estimated Chargeable Income (ECI) filing — Complete 2026 guide

Estimated Chargeable Income (ECI) is a company’s estimate of its taxable income for a financial year, filed with IRAS shortly after the year-end. This 2026 guide explains what Estimated Chargeable Income is, who must file it, the deadlines, the waiver thresholds, and how ECI interacts with the final Corporate Income Tax Return.

Raffles Corporate Services works with a panel of corporate and employment law firms; this article is general information, not legal advice.

What Estimated Chargeable Income is

ECI is an estimate of a company’s chargeable income for a given financial year, before deducting any exempt amounts. It is filed with IRAS ahead of the final return so that the company’s tax liability can be assessed early and instalment payment arrangements can begin. ECI is reported net of capital allowances and tax-deductible expenses but is an estimate, not the final figure.

Who must file ECI and the waiver

Most companies must file ECI within 3 months of their financial year-end. A company is exempt from filing ECI if it meets both conditions of the IRAS administrative waiver:

  • annual revenue is not more than S$5,000,000 for the financial year; and
  • the ECI is nil.

Both conditions must be satisfied. A company with revenue above S$5,000,000 must file ECI even if its estimated income is nil.

Cost, timeline and instalments

The numerical framework for ECI in 2026:

  • Filing deadline: within 3 months after the financial year-end.
  • Waiver threshold: revenue of S$5,000,000 or below and nil ECI.
  • Instalment incentive: companies that e-File ECI early can pay the resulting tax by GIRO in up to 10 monthly instalments, with fewer instalments offered the later the filing.
  • Tax rate: 17% applied to chargeable income.

Filing ECI early therefore has a genuine cash-flow benefit through a longer instalment plan. Capital expenditure such as qualifying renovation can reduce the estimate; see our guide to the section 14Q renovation and refurbishment deduction.

Step-by-step: filing ECI

  1. Determine the financial year-end and the 3-month deadline.
  2. Estimate revenue and chargeable income from the management accounts.
  3. Check whether the company qualifies for the filing waiver.
  4. If filing is required, e-File the ECI through the IRAS myTax Portal.
  5. Elect GIRO instalments if cash-flow smoothing is wanted.
  6. Reconcile the estimate to the final figure when the Corporate Income Tax Return is prepared.

Accurate management accounts make the estimate reliable; our guide to bookkeeping for Singapore SMEs sets out the records to keep.

Statutory basis

ECI rests on the Income Tax Act 1947. Section 63 of the Income Tax Act 1947 empowers the Comptroller to require a return of estimated income, and the consequences of underestimation or non-filing flow from the assessment and penalty provisions of the same Act. The ECI regime is therefore a statutory mechanism for early assessment, supported by administrative concessions such as the filing waiver.

Common mistakes and gotchas

Common errors include assuming the waiver applies when revenue exceeds S$5,000,000, filing late and losing the longer instalment plan, and confusing revenue with profit when testing the waiver. A materially low estimate that is later corrected upward can also trigger a revised assessment, so the estimate should be prepared with care rather than as a placeholder.

Authoritative sources

See IRAS ECI guidance at iras.gov.sg, financial reporting standards set by the Accounting Standards Committee, and company filing requirements from ACRA.

Frequently asked questions

When is ECI due?
ECI is filed within 3 months after the company’s financial year-end.

Do I still file ECI if my income is nil?
Only companies meeting the waiver (revenue S$5,000,000 or below and nil ECI) are exempt. Companies above the revenue threshold must file even with nil estimated income.

Is ECI the same as the final tax return?
No. ECI is an early estimate. The final chargeable income is reported in the Corporate Income Tax Return (Form C, C-S or C-S Lite) by 30 November.

What is the benefit of filing ECI early?
Earlier e-Filing unlocks a longer GIRO instalment plan, easing cash flow on the eventual tax payment.

Related guides

For wider context, see our the section 14Q renovation and refurbishment deduction, our Employment Pass and S Pass salary thresholds, and bookkeeping for Singapore SMEs.

Need help with this? Call, SMS or WhatsApp +65 8501 7133, or email [email protected]. Raffles Corporate Services works with a panel of corporate and employment law firms; this article is general information, not legal advice.