Enterprise Innovation Scheme (EIS) Singapore 2026: 400% Tax Deduction Explained

Published on: 11 Jun, 2026

The Enterprise Innovation Scheme (EIS) is one of the most generous business tax incentives Singapore has ever offered — granting a 400% tax deduction on the first S$400,000 of qualifying innovation spend across five activity buckets. If your company invests in R&D, IP, training, software development or innovation projects, you should not file your Form C-S/C without first checking whether you qualify.

Introduced in Budget 2023 and extended through YA 2028, the EIS sits inside the Income Tax Act 1947 (sections 14U, 14UA, 19B, 14C, 14D and related provisions) and is administered jointly by IRAS, Enterprise Singapore and the Singapore Economic Development Board (EDB). Cash-flow-poor SMEs can convert up to S$100,000 of qualifying spend into a 20% cash payout in lieu of deductions.

This 2026 guide unpacks the five qualifying activities, how the 400% maths actually works, who can claim, what documentation IRAS will demand, and the common errors that get claims clawed back.

What the Enterprise Innovation Scheme covers

The EIS lifts the standard tax deduction or allowance to 400% on the first S$400,000 of qualifying expenditure per Year of Assessment (YA) across five qualifying activities:

R&D conducted in Singapore — qualifying expenditure under Section 14C and Section 14D of the Income Tax Act 1947.
Registration of intellectual property (IP) — patents, trade marks, designs and plant varieties filed under Section 14A.
Acquisition and licensing of IP rights — capital expenditure under Section 19B for IP acquisitions exceeding S$50,000.
Training conducted via approved providers — SkillsFuture Singapore (SSG) certifiable courses.
Innovation projects with five Singapore partner institutions (polytechnics, ITE, A*STAR research entities).

Each bucket has its own S$400,000 expenditure cap. So a company spending S$400,000 in each of the five categories could in principle claim 400% on S$2 million of spend — though most SMEs will only touch one or two buckets.

How the 400% deduction actually works

The 400% figure is not a tax credit — it is an enhanced deduction. Suppose a company spends S$100,000 on qualifying R&D in YA 2026:

Base 100% deduction under Section 14C: S$100,000
EIS enhanced deduction: additional 300% = S$300,000
Total deduction allowed: S$400,000

If the company’s chargeable income (before the EIS uplift) is S$500,000 and the corporate tax rate is 17%, the additional S$300,000 deduction saves S$51,000 in tax. The cap applies per category, per YA — so unused expenditure caps cannot be carried forward.

For an overview of how EIS compares to the older R&D incentives, see our Section 14C & 14D R&D Tax Deductions in Singapore guide, and our Section 19B Writing-Down Allowance for IP walkthrough.

The 20% cash payout option for SMEs

Loss-making SMEs and start-ups that do not have taxable income often cannot use enhanced deductions. The EIS therefore lets eligible companies convert up to S$100,000 of qualifying expenditure (aggregated across all five categories per YA) into a non-taxable 20% cash payout — a maximum of S$20,000 per YA — in lieu of the enhanced tax deduction.

To qualify for the cash payout, the company must:

Be carrying on a trade or business in Singapore
Have made CPF contributions for at least three local employees for at least three months in the basis period
Elect the cash conversion in its Form C-S or Form C tax return (it is irrevocable once made)

For employer CPF basics, see our Skills Development Levy & employer obligations guide.

Who is eligible

EIS applies to any Singapore-resident company carrying on a trade or business in Singapore. There is no headcount or revenue ceiling for the enhanced deduction portion — though only SMEs that meet the CPF-employee test get the cash payout. Sole proprietorships and partnerships (LLPs and LPs) can also claim the enhanced deduction, but not via Form C-S.

Trusts, charities and statutory bodies generally do not qualify. Companies enjoying concessionary tax rates under incentive schemes (PCI, DEI, Section 13H venture capital fund, GTP) must take particular care — EIS deductions interact with concessionary income pools.

If your company is structured as a holding entity, read our Singapore Investment Holding Company tax guide first — pure investment-holding entities generally do not qualify because they are not carrying on a trade.

Documentation IRAS expects

EIS claims are made through the Form C/C-S, but the supporting documentation must be retained for at least five years in accordance with Section 67 of the Income Tax Act 1947. IRAS routinely audits enhanced-deduction claims and clawback risk is real. Expect to keep:

Project descriptions and scientific or technological objectives (for R&D)
IPOS or foreign IP registry filing receipts (for IP registration)
IP valuation and arm’s-length transfer-pricing documentation (for IP acquisitions over S$50,000)
Training course certificates from SSG-approved providers
Innovation project agreements signed with partner institutions
Detailed spend ledgers tied to the GL

For tax-residency and certification matters tied to IRAS submissions, see our Certificate of Residence (COR) guide.

Common errors that trigger clawback

IRAS publishes audit findings on EIS claims regularly. The most common errors RCS sees are:

Routine work claimed as R&D. Software bug-fixes, minor product variants, and market research do not qualify — only work with genuine novelty and technical risk does.
Training spend on non-SSG-approved courses. Internal training and overseas conferences typically do not qualify.
Double-claiming. Spend reimbursed by EDG, PSG or other government grants is not “qualifying expenditure”. Track grant-funded portions in a separate ledger account.
IP acquisitions under S$50,000. These fall outside Section 19B and so cannot get the EIS uplift.
Late election of cash payout. Once the Form C is filed, the election is locked.

Stacking EIS with other incentives

EIS can be stacked with — but not double-counted against — most other Singapore tax measures. In practice this means:

Foreign-sourced income exemption (FSIE) under Section 13(8) is unaffected — see our FSIE 2026 guide.
Start-up Tax Exemption (SUTE) and partial tax exemption work alongside EIS — the EIS deduction reduces chargeable income before the SUTE/PTE thresholds apply.
Pioneer Certificate Incentive (PCI) and Development & Expansion Incentive (DEI) recipients should ring-fence EIS-eligible spend to non-concessionary trade lines — see our PCI & DEI guide.
Government grant funding (EDG, PSG, MRA, SFEC) reduces the qualifying-expenditure base — net only the unfunded portion.

How to make the claim

EIS claims are filed through your annual Form C-S or Form C corporate tax return at myTax Portal. The cash payout election must be made in the same return — there is no separate application form. For ECI filing implications, see our ECI filing guide.

RCS recommends:

Identify EIS-qualifying spend at the start of each financial year, not at tax-filing time.
Set up dedicated GL accounts for R&D, IP, training, and innovation spend.
Maintain a project log for each R&D or innovation activity with technical objectives and outcomes.
Run a mid-year review with your tax adviser to confirm eligibility before too many sunk costs accumulate.
Decide early whether to take the enhanced deduction or the cash payout — model both before filing.

Official references

For Singapore corporate tax fundamentals, sister-site Singapore Secretary Services publishes a regular compliance series; international founders may also find Little Big Red Dot useful for Singapore market context.

EIS is one of the few tax incentives in Singapore that genuinely moves the needle for SMEs — but only for companies that plan their innovation spend deliberately. The 400% headline is real, but so is IRAS’s audit trail. Build the documentation discipline first; claim second.

— The Editorial Team, Raffles Corporate Services