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This YA 2027 short-basis-period tax computation example shows direct identification, ECI timing and the linked return waiver request.
A YA 2027 short-basis-period tax computation can arise when a company changes its financial year end from 31 December 2025 to 31 March 2026. IRAS’s current example assigns 1 January to 31 December 2025 to YA 2026 and the three months from 1 January to 31 March 2026 to YA 2027. The company prepares separate computations even though the accounts and filing process may connect the two years.
The worked example below shows the method. It uses hypothetical figures and does not replace the company’s ledger, tax facts or IRAS instructions.
Confirm the basis periods
Start with the old and new financial year ends and the effective ACRA filing. The IRAS tax computation page says a change across two Years of Assessment requires two separate computations.
For the published example, YA 2026 covers 1 January to 31 December 2025. YA 2027 covers 1 January to 31 March 2026. The normal 12-month cycle then resumes for YA 2028 from 1 April 2026 to 31 March 2027.
Check the company’s financial statements and management accounts against these dates. Do not use the return year as a substitute for the actual basis period.
Use direct identification first
IRAS states that the company should directly identify income and expenses to the corresponding basis period. Time apportionment may be used when direct identification is not possible.
Suppose the three-month YA 2027 period records S$600,000 of revenue, S$360,000 of direct costs, S$150,000 of operating expenses and S$10,000 of other income. The accounting profit before tax is S$100,000. These figures come from transactions dated to the short period, not one quarter of a 15-month total.
Prepare a bridge from the statutory accounts to each basis period. Reconcile opening and closing accruals, deferred income, payroll, related-party charges and foreign currency entries.
Calculate the hypothetical adjustments
Assume the S$150,000 of operating expenses includes S$8,000 of private or non-business costs, S$5,000 of accounting depreciation and a S$3,000 qualifying donation. Assume the company also has S$7,000 of current-year capital allowances and no brought-forward losses.
Start with the S$100,000 accounting profit. Add back S$8,000 of non-deductible costs and S$5,000 of depreciation. Deduct S$7,000 of capital allowances. This produces S$106,000 before the donation and any applicable exemption.
The donation and exemption treatment must follow the company’s actual facts and current return rules. Keep them as separate lines so the reviewer can trace every amount.
Present the short-period computation
| YA 2027 item | Hypothetical amount | Evidence |
|---|---|---|
| Revenue and other income | S$610,000 | Short-period ledger |
| Accounting profit before tax | S$100,000 | Management accounts |
| Add non-deductible costs | S$8,000 | Expense review |
| Add depreciation | S$5,000 | Fixed-asset schedule |
| Deduct capital allowances | S$7,000 | Capital allowance schedule |
| Adjusted amount before donation | S$106,000 | Computation total |
Label the figures clearly as a three-month computation. A short period does not justify quartering annual tax adjustments automatically. Insurance, subscriptions, bonuses and service charges may follow contract, accrual or tax rules that differ from straight-line time.
Handle shared costs carefully
Directly identify invoices and accruals where the records allow. For a 15-month audit fee or annual software licence, document whether the service relates to the short period, the full accounts period or another period.
Use time apportionment only when the company cannot apply direct identification. State the reason, formula and population. Apply the method consistently to comparable items.
Review capital allowances, renovation expenditure, donations, foreign income and related-party charges separately. Their tax timing may not follow the accounting split.
File both ECI amounts on time
The IRAS ECI guide gives separate deadlines for a cross-YA change. In the current example, YA 2026 ECI was due by 31 March 2026 and YA 2027 ECI by 30 June 2026, unless the company qualified for the ECI waiver.
Keep the short-period ECI file with revenue, estimated adjustments and the submission acknowledgement. The later computation may change the estimate, but it should explain the difference.
Do not wait for the combined corporate income tax return process before checking ECI. They are separate obligations.
Connect the return waiver request
IRAS instructs the company to request a waiver of the YA 2026 Corporate Income Tax Return through myTax Mail before 30 November 2026. The request should state the previous and current financial year ends and the YA for which the waiver is sought.
The company then completes the relevant fields for both YA 2026 and YA 2027 together in the YA 2027 return by 30 November 2027. A Form C filer also submits the computations, financial statements, detailed profit and loss statement and supporting documents for both YAs.
Retain the waiver request and IRAS response. Sending a request does not prove approval.
Review the worked file
Reconcile the two computations to the complete financial statements. Check that no income or expense disappears between periods or appears twice. Tie capital allowances and balances forward from YA 2026 into YA 2027.
Ask the reviewer to trace a sample of revenue, payroll, accruals and fixed assets to the dated ledger entries in each basis period. Separately check that the waiver request, both ECI acknowledgements and the later return use the same financial year-end history. A reconciliation signed before filing is more useful than trying to reconstruct the split after an IRAS query.
The changed-FYE tax computation guide explains the overall process. The ECI deadline calendar covers the filing sequence. The Singapore transfer pricing compliance workflow is the tax pillar cornerstone.
A sound YA 2027 short-basis-period tax computation uses real transaction dates, transparent allocation and a complete filing trail. The Tax Consulting hub connects the wider corporate tax library.