# UK Patent Box: Reduce Your Company Corporation Tax Understand the UK Patent Box regime rules and R&D nexus calculation to unlock an effective 10% Corporation Tax rate on qualifying patent profits. **Published:** 2026-07-03 **Updated:** 2026-07-04 **Source:** https://aztajournal.com/gb/uk-patent-box-corporation-tax --- > The UK Patent Box regime allows innovative companies to pay a reduced Corporation Tax rate of 10% on qualifying patent profits. By understanding eligibility rules and the R&D nexus calculation, businesses can secure a tax saving of up to 15%. Can your company significantly reduce its UK Corporation Tax bill on patent profits? Yes, by electing into the UK Patent Box regime, you can reduce your Corporation Tax rate from the main 25% rate down to an effective rate of 10% on qualifying intellectual property profits. This relief is delivered as an additional deduction in your Corporation Tax computation, offering a tax saving of up to 15 percentage points on eligible profits. ## Key Takeaways Before exploring the detailed statutory conditions, the table below provides a quick reference summary of the UK Patent Box regime, highlighting key financial benefits and core eligibility rules. | Feature | Details | | --- | --- | | Main Benefit | Effective 10% Corporation Tax rate on qualifying profits. | | Maximum Saving | Up to 15 percentage points compared to the main 25% Corporation Tax rate. | | Key Criteria | Company must hold qualifying patents and meet the development condition. | | Delivery Mechanism | An additional corporate tax computation deduction, not a direct cash rebate. | ## Can my company reduce Corporation Tax with Patent Box? Yes, companies can reduce their Corporation Tax liabilities by electing into the UK Patent Box regime, which slashes the tax rate to 10% on qualifying IP profits. This optional tax incentive applies to highly profitable patented innovations developed by businesses of any size. The incentive is structured specifically as an additional deduction when calculating your net taxable profits, meaning you do not receive a physical cash rebate from HM Revenue and Customs. Instead, the deduction offsets your overall Corporation Tax liability, ensuring that the qualifying profit portion is taxed at the effective 10% rate, driving substantial cash tax savings for reinvestment. ## What is the UK Patent Box regime? The UK Patent Box regime is a statutory corporate tax incentive established under Part 8A of the Corporation Tax Act 2010 (specifically Section 357A) designed to encourage UK businesses to commercialise patented inventions. The regime works by applying a preferential 10% corporate tax rate to profits arising from these qualifying patented technologies. Under Section 357A of the Corporation Tax Act 2010, the benefit is calculated using a specific statutory formula. When the main UK Corporation Tax rate is 25%, the formula automatically adjusts to grant a deduction equal to 60% of the company's relevant intellectual property profits, achieving the targeted 10% tax rate on those specific profits. ## Who is eligible to claim Patent Box commercial relief? To qualify for Patent Box relief, your business must satisfy three strict statutory tests regarding company, intellectual property ownership, and development status. These criteria ensure that the tax relief is restricted to companies actively engaged in genuine technical innovations. 1. **Company Eligibility**: Your business must be subject to UK Corporation Tax, which includes UK resident companies or non-resident entities trading via a UK permanent establishment. 2. **Qualifying IP Rights**: Your company must own, or hold an exclusive licence to, a patent granted by the UK Intellectual Property Office, the European Patent Office, or specified EEA countries. 3. **Qualifying Development Condition**: Your company must have made a significant technical contribution to creating or developing either the patented invention or a product incorporating it. ## What counts as relevant IP income (RIPI)? Relevant IP income comprises the gross income streams derived directly from patented items, patented processes, or related statutory compensation. Crucially, if a complex product contains even one patented component, 100% of the worldwide sales revenue from that entire product can qualify for relief. For the purposes of the regime, the following primary income categories qualify as relevant IP income: - Worldwide sales of products that physically incorporate the patented component or item. - Licence fees, royalties, or exploitation income received from granting rights over the patented technology. - Direct proceeds generated from selling or permanently transferring patent rights to another business. - Damages, insurance payouts, or court compensation awarded due to patent infringement activities. - Income received from utilising a patented manufacturing tool or a patented corporate process. ## How does the R&D Fraction (Nexus Rule) affect claims? The R&D fraction scales your Patent Box benefit based on the proportion of development expenditure actually carried out by your own business. It is a mandatory compliance step designed to align the corporate tax savings with actual local research and development activities. Under the internationally agreed nexus rules, if a company undertakes all of its research and development in-house or outsources it entirely to unconnected third-party contractors, the resulting fraction is calculated as one. This perfect ratio allows the business to claim the full 10% effective tax rate on 100% of its qualifying intellectual property profits. Conversely, if the company acquires the patents from other entities or outsources its core research and development tasks to connected group companies, the resulting fraction drops below one. This lower fraction reduces the final proportion of commercial profits that can benefit from the preferential 10% corporate tax rate. ## How do you calculate and claim the Patent Box reduction? To claim the Patent Box reduction, you must calculate your relevant IP profits and apply the statutory Corporation Tax deduction formula. You must then submit this calculated tax adjustment within your annual company corporate tax return (Form CT600). The statutory deduction is calculated using the formula set out in Section 357A of the Corporation Tax Act 2010. You calculate the deduction by multiplying your relevant IP profits by the difference between the main tax rate and the 10% rate, then dividing that result by the main tax rate. > Deduction = Relevant IP Profits × ((Main Rate − 10%) ó Main Rate) With the current main corporate tax rate set at 25%, this formula yields a tax deduction equal to exactly 60% of your eligible patent profits. You must elect into the regime in writing within two years from the end of the accounting period in which those patent profits arose. ## How does Patent Box interact with R&D Tax Relief? The Patent Box works in tandem with UK Research and Development tax reliefs to support the entire lifecycle of corporate innovation. R&D tax incentives subsidise the high upfront costs of inventing new technologies, while the Patent Box rewards the eventual commercialisation phases. Crucially, a company can claim both corporate tax incentives simultaneously without any clawbacks or tax penalties. While the R&D claim reduces the historical cost of creating the patent, the Patent Box subsequently reduces the ongoing corporate tax liability on the profits generated from selling that intellectual property. ## Frequently Asked Questions ### Can I claim Patent Box while my patent application is still pending? Yes, you can elect into the Patent Box regime while your commercial patent application is still pending. However, the associated corporate tax relief is held in abeyance and will only be granted once the patent is officially approved by the relevant Registry. ### Do trademarks, copyright, or designs qualify for the Patent Box? No, trademarks, copyright, and design rights do not qualify for the Patent Box. The UK regime is strictly limited to patents granted by the UK Intellectual Property Office, the European Patent Office, or designated EEA patent offices. ### Can group companies share the benefit of the Patent Box? Yes, group companies can share the benefit if the qualifying development test is met by one group member, provided the patent-holding company also plays an active role in managing the intellectual property portfolio. ### What happens if a passive holding company owns the patents? If a passive holding company with no employees or active development operations owns the patents, it cannot claim. The regime requires active, significant technical contributions to prevent passive exploitation of tax reliefs.