CORPORATE TAX GUIDE · SINGAPORE
Tax computation in Singapore: 10 adjustments SMEs commonly miss
Your accounting profit is the starting point—not automatically the figure taxed. Use this guide to understand the adjustments that commonly sit between the accounts and your company's tax return.
THE SHORT ANSWER
A tax computation explains why accounting profit and chargeable income differ.
It starts with the profit or loss in the financial statements, then records the tax adjustments needed to arrive at chargeable income. The right adjustments depend on the company's actual transactions, records and tax position.
REVIEW THESE FIRST
Ten adjustments worth checking before you file.
These are common review points, not a universal checklist. A transaction can require a different treatment depending on its facts, so retain the supporting documents and ask for advice where the answer is not clear.
Depreciation in the accounts
Depreciation is normally added back in a tax computation because it is not tax-deductible. The company may instead claim capital allowances for qualifying fixed assets used in its trade or business.
Private or personal expenses
An expense that is partly private or not incurred for the company’s income-producing activity may need to be added back. Keep a clear explanation for costs that could look personal, mixed-use or shareholder-related.
Fines and penalties
Fines and penalties are common add-backs. Do not assume that an amount recorded as an expense in the accounts is automatically deductible for corporate income tax.
Capital costs recorded as expenses
The purchase cost of a fixed asset and other capital expenditure do not follow the same treatment as day-to-day revenue expenses. Identify capital items early so their tax treatment and supporting schedules can be reviewed.
Income that is not taxable
Some amounts recognised in the accounts may not be taxable. A tax computation removes qualifying non-taxable income instead of treating every accounting receipt as part of chargeable income.
Investment income assessed separately
Interest, dividends and rental income can have a different tax treatment from trading income. The computation may need to separate the income and its direct expenses rather than leave both inside operating profit.
Direct costs tied to investment income
When investment income is assessed separately, the related direct expenses need attention too. A broad accounting category is rarely enough: retain the schedules that explain which costs relate to which income.
Current-year capital allowances
Capital allowances are not simply the depreciation figure with a new label. The claim needs a schedule of asset additions, disposals and the basis of calculation, and the method chosen can affect the claim timing.
Brought-forward capital allowances and trade losses
Amounts from earlier Years of Assessment may be available, but their use is subject to conditions. Check the prior-year tax computation, shareholding position and business continuity before assuming a balance can be used.
Approved donations and unutilised donations
Only qualifying approved donations receive the relevant tax treatment. If a deduction is not fully used, it may be carried forward subject to the applicable conditions and time limit—so the supporting records matter.
THE THREE DOCUMENTS THAT MATTER
Good tax workings are traceable back to the records.
Financial statements
The starting profit or loss and the accounting treatment that the computation needs to explain.
Supporting schedules
The detail behind adjustments, capital allowances, income categories, claims and brought-forward amounts.
Source documents
Invoices, contracts, bank records and fixed-asset information that substantiate the position taken.
DO NOT LOSE THE THREAD
Brought-forward items need more than a number copied from last year.
Before claiming prior-year capital allowances, trade losses or donations, reconcile the opening balance to the previous tax computation and check the conditions that apply. The ability to carry items forward is not automatic simply because they appeared in last year's accounts.
Review IRAS guidance on unutilised itemsHOW THIS FITS INTO FILING
The form does not replace the work behind it.
Form C-S and Form C-S (Lite)
Prepare the tax computation and supporting schedules before filing, then retain them in case IRAS asks for them. A simplified return does not mean the underlying tax work disappears.
Form C
File the tax computation and supporting schedules with the return, together with the other documents that apply to the company's filing position.
Common questions.
What is a tax computation?
A tax computation is the statement that adjusts accounting profit or loss to arrive at income chargeable to tax. It records items such as non-deductible expenses, non-taxable income, capital allowances and unutilised amounts from prior years.
Does a company filing Form C-S need a tax computation?
Yes. A company should prepare its tax computation and supporting schedules before completing Form C-S or Form C-S (Lite), then retain them for submission if IRAS requests them. Form C filers submit the required documents with the return.
Is accounting depreciation deductible for tax?
Generally, no. Depreciation shown in the financial statements is not tax-deductible. A company may instead claim capital allowances for qualifying fixed assets used in its trade or business.
Can every loss brought forward reduce this year’s tax?
No. The availability of brought-forward items depends on the type of item and the relevant qualifying conditions. Review the prior-year computation and the company’s circumstances before making a claim.
What should we give our accountant?
Start with the financial statements, general ledger, expense schedules, fixed-asset register, bank reconciliations, relevant invoices and prior-year tax computations. Extra documents may be needed depending on the company’s income, claims and transactions.
This guide provides general information, not tax or legal advice. The tax treatment of a transaction depends on its facts and supporting records. Confirm the company's position before filing or making a claim.