Allowable business expenses under the Income Tax Act — Timeline and processing benchmarks

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

Understanding allowable business expenses under the income tax act is the difference between paying tax on gross revenue and paying it only on true profit. In Singapore, an expense is deductible when it is wholly and exclusively incurred in the production of income and is not specifically prohibited by statute.

What allowable business expenses under the income tax act means

The governing test for allowable business expenses under the income tax act is set out in section 14(1) of the Income Tax Act 1947, which permits a deduction for outgoings and expenses wholly and exclusively incurred in the production of income during the basis period. Section 15 then lists expenses that are specifically disallowed, such as private or domestic expenses and capital withdrawals.

In short, a cost is deductible only if it is revenue in nature, incurred to earn assessable income, and not caught by a specific prohibition. Capital expenditure is not deductible under section 14 but may attract capital allowances under separate provisions.

Who needs to get this right

Every Singapore company preparing its corporate tax computation must classify expenses correctly. Owner-managed SMEs are most exposed, because the line between business and private spending is easily blurred. Getting the classification right feeds directly into the tax computation covered in our Singapore corporate tax guide.

Businesses relocating staff should also note that many employment-related costs are deductible; the salary and levy rules in our work pass and relocation guide interact with what can be claimed.

What is deductible and what is not

Commonly deductible costs include employee salaries and CPF contributions, office rent, utilities, business insurance, professional fees, marketing, and the running costs of business assets. Interest on money borrowed to produce income is deductible, subject to the conditions in the Income Tax Act 1947.

Commonly disallowed items include private motor-car expenses, personal drawings, fines and penalties, general provisions, and expenses of a capital nature. Certain costs are deductible only under specific rules, such as renovation and refurbishment under section 14N; our overview of the allowable business expenses breakdown lists the practical categories.

Numbers, thresholds and timelines

The corporate tax filing cycle drives the discipline. Estimated Chargeable Income must generally be filed within three months of the financial year end, and the Form C-S or Form C is due by 30 November each year. Companies must keep proper records for at least five years under the Income Tax Act 1947.

Two reliefs reward good record-keeping: the partial tax exemption gives 75% exemption on the first S$10,000 of chargeable income and a further 50% on the next S$190,000, while qualifying new companies may claim the start-up tax exemption. Both apply only after allowable expenses have reduced chargeable income correctly.

Step-by-step: claiming expenses correctly

First, capture every business cost with a supporting invoice or receipt. Second, separate revenue expenses from capital expenditure. Third, remove disallowed items such as private and domestic costs. Fourth, add back non-deductible items in the tax computation. Fifth, claim capital allowances separately where assets qualify. Sixth, file the Estimated Chargeable Income and the Form C-S or Form C by the statutory deadlines.

Section 14(1) of the Income Tax Act 1947 anchors the deduction, while section 15 sets the prohibitions. Reading the two together is the practitioner’s daily task.

Common mistakes and gotchas

SMEs frequently claim private expenses run through the company, over-claim motor-car costs, or treat capital purchases as immediate deductions. Others miss legitimate claims, such as pre-commencement revenue expenses and renovation deductions. Poor documentation is the underlying cause of most adjustments during an IRAS review, so a clean records trail is the best protection.

Capital allowances: the companion to expense deductions

Because capital expenditure is not deductible under section 14 of the Income Tax Act 1947, businesses recover the cost of qualifying assets through capital allowances instead. Plant and machinery can be written down over their working life, or in many cases claimed fully in the year of purchase under the accelerated provisions. Getting the split between revenue expense and capital allowance right is central to an accurate tax computation.

Small assets can often be written off in full, and there is a cap on the total cost that can be claimed under the full write-off in one year. Because the rules change from time to time, the treatment should be checked against the current IRAS guidance for each year of assessment.

Documentation that survives an IRAS review

The deduction test is evidential as much as legal. For each material expense, IRAS expects to see a tax invoice or receipt, a clear business purpose, and, where private use is possible, a reasonable apportionment. Board minutes supporting directors’ fees, contracts supporting professional charges, and mileage logs supporting travel all strengthen a claim.

The weakest claims are those supported only by a bank statement line. Building the habit of filing the supporting document against every expense, month by month, is the single most effective way to protect deductions and to keep the year-end tax computation efficient.

Timing: matching expenses to the right basis period

An expense is generally deductible in the basis period in which it is incurred, not necessarily when it is paid. Accruals for costs relating to the year, such as unpaid utilities or professional fees, are deductible even if settled after year end, provided the liability genuinely relates to that period.

Conversely, prepayments that relate to a future period should be carried forward rather than deducted early. Owner managed businesses that work off cash movements alone often misstate the timing, which either overstates or understates profit for the year.

FAQs

What makes an expense deductible in Singapore?
Under section 14(1) of the Income Tax Act 1947 an expense is deductible if it is wholly and exclusively incurred in the production of income and is not specifically prohibited.

Are private expenses deductible?
No. Private and domestic expenses are disallowed under section 15 of the Income Tax Act 1947 and must be added back in the tax computation.

Is capital expenditure deductible?
Capital expenditure is not deductible under section 14, but it may attract capital allowances under separate provisions of the Act.

How long must records be kept?
Companies must retain proper records for at least five years under the Income Tax Act 1947.

Official resources and related guides

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.