CORPORATE TAX GUIDE · SINGAPORE
Singapore corporate tax filing for SMEs
Your company usually has two tax filings each year—not one. Here is how ECI, the annual return and the underlying tax computation fit together.
The short version: two filings, two different jobs.
FIRST
Estimated Chargeable Income
ECI estimates taxable profit and is generally due within three months after your financial year end. Filing early may provide more GIRO instalments.
THEN
Annual corporate tax return
Form C-S, Form C-S (Lite) or Form C reports actual income for the Year of Assessment. The filing deadline is 30 November each year.
THE WORKFLOW
A clean filing process starts before the tax form.
Close the financial year
Complete the bookkeeping, reconcile bank and control accounts, record year-end adjustments and prepare the financial statements.
Estimate chargeable income
Adjust accounting profit for tax purposes and file ECI within three months after the financial year end, unless the company qualifies for a waiver.
Prepare the tax computation
Support deductible expenses, add back non-deductible items, calculate capital allowances and account for losses, donations or applicable exemptions.
File the annual tax return
Submit Form C-S, Form C-S (Lite) or Form C by 30 November, then review the Notice of Assessment when IRAS issues it.
ECI WAIVER
“No tax to pay” does not automatically mean “no ECI to file.”
The common ECI waiver applies only when both conditions are met: annual revenue is S$5 million or below, and ECI is nil before deducting the exempt amount under the partial or start-up tax exemption scheme.
Check the waiver and deadlineTAX COMPUTATION
Why accounting profit is not the final taxable amount.
Singapore’s headline corporate income tax rate is 17%, but it applies to chargeable income. A tax computation bridges the profit in the accounts to the amount assessed for tax.
Accounting profit
Start with the profit or loss in the company’s financial statements.
Add back non-deductible items
Examples may include private expenses, fines, income tax and depreciation in the accounts.
Claim allowable deductions
Deduct qualifying business expenses and other tax deductions that are properly supported.
Calculate capital allowances
Capital allowances may replace accounting depreciation for qualifying fixed assets used in the business.
Apply relevant reliefs
Consider qualifying losses, donations, partial exemption or the start-up tax exemption before arriving at tax payable.
WHICH FORM?
Form C-S, Form C-S (Lite), or Form C?
| Return | Revenue test | Who it may suit |
|---|---|---|
| Form C-S (Lite) | S$200,000 or below | Qualifying Singapore-incorporated companies with straightforward tax matters. |
| Form C-S | S$5 million or below | Qualifying Singapore-incorporated companies that meet all other C-S conditions. |
| Form C | No revenue cap | Companies that do not meet the simplified-return conditions. |
Revenue alone does not determine eligibility. Review all conditions in the IRAS return overview.
Compare the three returns in detailPREPARATION CHECKLIST
Records to have ready.
- Final trial balance and financial statements
- General ledger and detailed expense schedules
- Bank statements and reconciliations
- Invoices, receipts and contracts supporting material transactions
- Fixed-asset register and purchase or disposal documents
- Payroll, director remuneration and CPF records
- Details of related-party and overseas transactions
- Prior-year tax computation, assessment and unutilised tax items
Companies should retain relevant source documents and accounting records for at least five years from the relevant Year of Assessment.
Common questions.
Does every Singapore company need to file corporate income tax?
Companies generally report their income to IRAS each year, including dormant companies unless IRAS has granted a waiver from filing. The return required depends on the company’s circumstances.
What is the difference between ECI and Form C-S?
ECI is an early estimate of taxable profit, generally due within three months after the financial year end. Form C-S, Form C-S (Lite) or Form C is the annual return declaring the company’s actual income and is due by 30 November.
When can a company skip ECI filing?
A company qualifies for the common ECI waiver when annual revenue is S$5 million or below and ECI is nil for that Year of Assessment. Both conditions must be met, and the company should retain its workings.
Which corporate tax form should an SME use?
Form C-S may be available to a Singapore-incorporated company with annual revenue of S$5 million or below that meets IRAS’s other conditions. Form C-S (Lite) is an option for qualifying companies with revenue of S$200,000 or below. Other companies file Form C.
Is Singapore corporate tax simply 17% of accounting profit?
No. The 17% headline rate applies to chargeable income, not automatically to accounting profit. Tax adjustments, capital allowances, losses and any applicable exemption can change the final tax payable.
How long should company tax records be kept?
IRAS requires companies to retain source documents, accounting records, schedules, bank statements and connected transaction records for at least five years from the relevant Year of Assessment.