This track is for accountants and tax advisors who prepare or review R&D claims for Singapore clients. Singapore gives enhanced tax deductions for qualifying R&D, including under the Enterprise Innovation Scheme (EIS), with an option to convert part of the expenditure into a cash payout, administered by the Inland Revenue Authority of Singapore. There is no registration and no approval; the claim is made in the corporate income tax return by 30 November of the Year of Assessment. The practitioner's work is in classifying every item by tier and location, deciding the cash payout election, and keeping documentation IRAS can ask for on review.
How the Singapore rules change the program
| Module | What is different in Singapore | Country page |
|---|---|---|
| Legislation and guidance | Income Tax Act 1947 section 2 (definition of research and development) and sections 14C and 14D; the IRAS e-Tax Guides on Research and Development Tax Measures and on the Enterprise Innovation Scheme. | Enterprise Innovation Scheme |
| Eligibility analysis | IRAS applies three requirements: the objective, novelty or technical risk, and systematic study. Technical risk exists where the probability of achieving the technical objective cannot be known in advance by a competent professional; novelty is new in the field rather than new to the business. | Eligibility |
| Advanced calculations | 400% on the first S$400,000 of staff costs and consumables for R&D carried out in Singapore, YA 2024 to YA 2028; 250% above; 100% for other R&D expenditure and for overseas R&D related to the trade. Cash payout at 20% of up to S$100,000. | Enhanced deductions |
| Technical interviews | IRAS considers the state of knowledge in the field at the start of the project, the reasons the objective could not be achieved with that knowledge and the systematic work performed, and may consult technical experts. | Documentation |
| Reports and narratives | IRAS requires an R&D claim form for larger claims, giving project descriptions and a breakdown of expenditure; check IRAS guidance for the current threshold. The tax computation separates the base, additional and EIS enhanced amounts. | IRAS requirements |
| Disputes and audits | IRAS may request further information before finalising the assessment and selects companies for audit on a risk basis. Objection within 2 months of the notice of assessment; appeal to the Income Tax Board of Review within 30 days of the notice of refusal to amend. | Reviews and audits |
| Ethics, integrity and fee arrangements | An incorrect return without reasonable excuse carries a penalty of up to 200 percent of the tax undercharged. Whether contingent fees are permitted depends on the professional body the advisor belongs to; see knowyourfees.org. | Why claim integrity matters |
Forms and deadlines
| Form or step | Deadline or rule | Country page |
|---|---|---|
| Registration or approval | None. IRAS offers an advance ruling service, for a fee. | How to claim |
| Estimated chargeable income | Within 3 months after the financial year end, unless the company qualifies for the waiver. | Deadlines |
| Form C-S or Form C with the tax computation, and the R&D claim form where required | By 30 November of the Year of Assessment. | How to claim |
| EIS cash payout application | Submitted after filing the income tax return and by the filing due date, through the Apply for EIS Cash Payout service. An approved election is irrevocable. | Cash payout option |
| Objection | Within 2 months of the date of the notice of assessment. | Reviews and audits |
| Revision and additional assessment | Within 4 years from the end of the Year of Assessment, including to allow an omitted deduction; no time limit in cases of fraud or wilful default. | Deadlines |
| Records | 5 years from the relevant Year of Assessment. | Documentation |
Key rules to know
Location sets the tier. Whether R&D is carried out in Singapore is determined by where the R&D activities are physically performed. R&D undertaken outside Singapore is deductible only where it is related to the taxpayer's trade or business, and only at 100 percent. Only qualifying expenditure on R&D carried out in Singapore may be converted into the EIS cash payout. See R&D done in Singapore vs overseas.
Category sets the tier too. Staff costs for the enhanced deduction comprise salaries, bonuses, allowances and employer CPF contributions of employees directly engaged in the R&D, excluding directors' fees, apportioned where the employee is not wholly engaged. Consumables are materials and items used up or transformed in the R&D, excluding utilities and items of a capital nature.
No double counting. R&D expenditure met by a government grant or subsidy is not deductible to the extent of the grant. Expenditure converted into a cash payout is not also deductible, and an item of expenditure cannot qualify under more than one EIS activity.
The payout is small and conditional. The cash payout needs at least three full-time local employees, each earning a gross monthly salary of at least S$1,400, employed for six months or more in the basis period. Where there is no profit, the deductions become unabsorbed losses that may be carried forward indefinitely subject to the shareholding test under section 37.
Worked example
Illustrative example. Jurong Photonics Pte Ltd, a hypothetical profitable company taxed at 17% on the relevant income, has a financial year ending 31 December 2025, so the claim falls in YA 2026 and the return is due 30 November 2026. Singapore staff costs of directly engaged engineers are S$450,000 and consumables S$50,000; a government grant of S$50,000 met part of the staff costs; overheads and software are S$60,000; and S$40,000 of overseas R&D is related to the trade. The practitioner compares deducting everything with electing the cash payout on S$100,000 of Singapore staff costs.
| Step | Deduct everything | Convert S$100,000 to cash payout |
|---|---|---|
| Singapore staff costs and consumables borne by the company | S$500,000 less S$50,000 grant = S$450,000 | S$450,000 less S$100,000 converted = S$350,000 |
| 400% tier (first S$400,000) | S$400,000 x 400% = S$1,600,000 | S$350,000 x 400% = S$1,400,000 |
| 250% tier (above S$400,000) | S$50,000 x 250% = S$125,000 | Nil |
| 100% tier: overheads, software and overseas R&D | S$100,000 | S$100,000 |
| Total deduction and tax saved at 17% | S$1,825,000; S$310,250 | S$1,500,000; S$255,000 |
| Cash payout at 20% | Nil | S$20,000, not taxable |
| Total benefit | S$310,250 | S$275,000 |
For a profitable client the deduction wins by S$35,250, so the practitioner claims the full deductions in Form C, with the tax computation separating the tiers and the R&D claim form where required. Had Jurong been loss-making with no profits expected soon, the S$20,000 payout would be the only cash available.
Related country guide pages
Self-check questions
Answer each question, then open it to compare.
A client incurred S$500,000 of staff costs and consumables on R&D carried out in Singapore in its financial year ending 31 December 2025. In which Year of Assessment is it claimed, by when, and at what tiers?
Part of the development was done by the client's engineers at an overseas subsidiary. Which tier applies to those costs?
The client wants the EIS cash payout. What conditions and timing apply?
Your client's claim includes overheads and utilities within the staff costs and consumables figure. What is wrong?
After filing, the practitioner discovers an error that overstated the claim. What does IRAS's voluntary disclosure programme offer?
Official sources
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Educational content only, not tax advice. See the disclaimer.