Ireland's 6.25% Knowledge Development Box

International Tax Review is part of Legal Benchmarking Limited, 1-2 Paris Garden, London, SE1 8ND

Copyright © Legal Benchmarking Limited and its affiliated companies 2026

Accessibility | Terms of Use | Privacy Policy | Modern Slavery Statement

Ireland's 6.25% Knowledge Development Box

The Irish Finance Bill was published on October 22 2015. Besides country-by-country reporting, it provides draft legislation of the first OECD modified nexus intellectual property box – the Knowledge Development Box (KDB). As expected, the tax rate applying to eligible income under the new regime will be 6.25%. Gains from the disposal of IP remain taxable at 33%.

Despite speculation that the Irish KDB would be limited to income from patents linked to research and development (R&D) conducted in Ireland, the box is slightly more generous and, indeed, driven by the pharmaceutical and technology focus of the Irish economy. It applies to arm’s-length income derived from qualifying expenditure in the EU by a company liable to Irish corporation tax from:

  • computer programs under the Irish Copyright and Related Rights Act 2000;

  • qualifying patent and supplementary protections. Supplementary protection certificates are extensions of patent protection where the invention in question is a product for humans or animals or a plant protection product that requires a marketing authorisation before the product can be sold – for example, [drug] authorisation. The extension compensates the patentee for the delay in launching the product while awaiting the marketing authorisation, which may take several years to be granted; and

  • plant breeders' rights.

Software programs are protected in Irish law under the Copyright and Related Rights Acts 2000 and there is no registration requirement. Software programs in Ireland, in line with European law, include all computer programs which are original in that they are the company's own intellectual creation and include any design materials used for the preparation of the software program. Also included are derivative works or adaptations of computer programs. An adaptation of a computer program would include arrangements, other alterations and translations (which in turn includes making a version of a computer program in which it is converted into or out of a computer language or code or into a different computer language or code).

"Qualifying patents" include granted patents (wherever granted) but such patents must follow substantive examination for novelty and inventive steps. Therefore, not all patent systems may be covered and in Ireland, the Irish short term patent system is excluded. However, a special system for reliefs for smaller companies will apply to Irish short term patents.

Determination of income eligible for 6.25% rate

Income eligible for the 6.25% reduced rate is determined by reference to the proportion of qualified expenditure in relation to the total expenditure on qualifying intellectual property. In determining the proportion of income eligible for the reduced 6.25% rate, bought-in intellectual property and research and development by related parties is largely denied the benefit of the low rate box.  There is, however, provision for such expenditure to be included in a deemed uplift of a combined maximum of 30% of qualifying expenditure. Unlike Irish R&D credits, expenses from unrelated third parties is regarded as qualifying expenditure.

Statutory definition of KDB specified trade

Ireland's 12.5% tax regime applies to income from a trade carried on in Ireland. Irish legislation contains no detailed definition of ‘a trade’. Helpfully, the KDB legislation defines a KDB specified trade as including one or more of the following categories of activities:

(i)    the managing, developing, maintaining, protecting, enhancing or exploiting of intellectual property;

(ii)   the researching, planning, processing, experimenting, testing, devising, developing or other similar activity leading to an invention or creation of intellectual property; or

(iii)  the sale of goods or the supply of services that derive part of their value from activities described in subparagraphs (i) and (ii), where those activities were carried on by the relevant company.

Where such activities are carried on, they are effectively deemed to be a trade.

OECD BEPS compliance

Bearing in mind the UK Patent Box and the OECD report on Action 3 on ‘Countering Harmful Tax Practices’, the KDB is drafted deliberately to satisfy OECD BEPS objectives. Having regard to the dates of expiration of other IP preferential regimes and the various OECD initiatives, it is noticeable that the regime is initially stated to apply to income of companies for accounting periods beginning on or after January 1 2016 and before December 31 2020. Further, OECD BEPS compliance is reflected in the inability to claim interest relief on loan finance against profits eligible for the 6.25% rate.

Reasons to choose Ireland

The latest Irish Government initiative to attract part of the world knowledge economy to Ireland is a welcome fiscal initiative for multinationals to be based in Ireland. Being BEPS compliant should mean the Irish KDB cannot be challenged by other countries' controlled foreign companies (CFC) regimes (under OECD Action 3). Where groups have income that is not eligible for the 6.25% rate, they may wish to consider using the benefits of Ireland's 12.5% corporation tax rate and the ability to use tax amortisation for bought-in intellectual property. Ireland's 25% R&D tax credit regime also continues to be available and interacts with the KDB.

Finally, it should be noted that the KDB legislation contains an ability for the Revenue to police the regime using external experts. While the draft legislation, in conjunction with existing law, attempts to preserve confidentiality, it is not clear that the proposed procedure gives sufficient comfort to companies claiming relief regarding the identity of the expert and the confidentiality of the information provided to the expert. A statutory confidentiality obligation applicable to the expert would appear to be in order.



John Gulliver (+353 1 614 5007; jgulliver@mhc.ie), Robert Henson (+353 1 614 2314; rhenson@mhc.ie) and Maura Dineen (+353 1 614 2444; mdineen@mhc.ie) are tax partners at Mason Hayes & Curran, a principal International Tax Review correspondent in Ireland.

more across site & shared bottom lb ros

More from across our site

With a stark divergence between MNEs that prepared early and those rushing to catch up, advisers must remain agile with all manner of compliance risks
The EU agreed new cooperative and investigative measures to tackle VAT fraud, while Hungary faced legal action and Lavez Coutinho expanded its indirect tax team
The arrival of a team from Brazilian rival Costa Tavares Paes Advogados brings SiqueiraCastro’s tax headcount to seven partners and 30 associates
CSR initiatives can sometimes venture into virtue signalling, but Ryan’s tax literacy event for schoolchildren was a genuine and necessary endeavour
Grant Thornton advanced plans to integrate its Australian firm into its US arm, as tax developments spanned law firm hires, aviation levies and digital services taxes
A new focus on early intervention and increased AI use is transforming how tax authorities are approaching TP audits, though capacity-constrained jurisdictions risk falling behind
The French administration has used AI to detect undeclared swimming pools and verandas but always includes a human in the loop, the AI in Tax Forum heard
The UK tax authority’s deputy director of large business also reassured taxpayers that HMRC will not ‘nitpick’ returns
Sucafina’s tax chief was speaking at the ITR Pillar 2 Forum in London alongside experts from HMRC and other organisations
India’s Supreme Court rattled cross‑border structuring with its Tiger Global ruling. Subsequent rule changes narrowed the impact, but significant risks around GAAR, substance and treaty access persist
Gift this article