By Iain Russell, Patent Attorney and Director at Russell IP – a UK and European Patent Attorney with over 20 years’ experience in patents for technology innovations. Russell IP is regulated by IPReg.
What Is The UK Patent Box, And How Can It Save Your Company Tax?
Published: July 2026 | Last updated: July 2026
The UK Patent Box is a tax scheme that can reduce the Corporation Tax a company pays on profits from its patented inventions, in some cases to an effective rate of 10%. For a profitable, innovative business, that can be a significant saving – and it is a benefit of patents that many founders and inventors overlook.
Most people think of a patent as a way to stop competitors copying an invention. That is usually its core purpose. But a granted patent may also open the door to the Patent Box, making your patent a potential tax-saving asset.
We are patent attorneys, not tax advisers, so our focus here is on the patent side: how patent strategy and securing the right patents can support a Patent Box claim. We work alongside specialist Patent Box tax advisers on the tax side, and we would always recommend taking specialist tax advice before relying on the scheme.
In this post, we explain what the UK Patent Box is, who can benefit, which profits and patents qualify, how a single patented component can sometimes bring a whole product into the scheme, how patent strategy affects it, and how the benefit is calculated – including how it can sometimes reach back to before a patent is granted.
Key Takeaways
- The UK Patent Box can reduce Corporation Tax on profits from patented inventions to an effective rate of 10%, compared with the current main rate of 25%.
- It is not automatic: a company must elect in (normally within two years of the end of the relevant accounting period) and meet conditions, including having undertaken qualifying development.
- A single qualifying patent, even one covering only one component, can sometimes bring the sales of a whole product – including worldwide sales made through the UK company – into the scheme.
- The 10% rate applies only to “relevant IP profit”, which is usually less than total profit after HMRC’s deductions, so the real saving is smaller than a simple 25% versus 10% comparison suggests.
- The benefit can last for the life of the patent (typically up to 20 years) and may, in limited circumstances, reach back up to six years before grant.
This is general information, not legal or tax advice. This article is a general guide to the UK Patent Box. We are patent attorneys rather than tax advisers. Every invention, business, and patent strategy is different, and the tax position in particular depends on your circumstances. If you would like advice on your situation, please contact Russell IP to discuss it – we can also introduce you to specialist Patent Box tax advisers.
Contents
- What is the UK Patent Box?
- Who can benefit from the Patent Box?
- Which patents qualify?
- Does the Patent Box apply to worldwide sales?
- What if my company is part of a group?
- What profits and income can qualify?
- Can one patented component cover a whole product?
- Which innovations can the Patent Box apply to?
- What patent strategy works best for the Patent Box?
- How much can the Patent Box save?
- How long does the benefit last, and can it be backdated?
- Conclusion
- Frequently Asked Questions
What Is The UK Patent Box?
The UK Patent Box is a Government scheme that lets a company apply a reduced 10% rate of Corporation Tax to profits earned from patented inventions, instead of the main rate (currently 25%). It was introduced in phases from 2013 and is designed to reward companies that keep and commercialise intellectual property in the UK.
The relief is not automatic. A company has to elect into the Patent Box, normally within two years after the end of the accounting period in which the relevant profits arose.
It is also delivered as a deduction in the Corporation Tax computation rather than as a cash payment, so it tends to be of most use to companies that are profitable and paying Corporation Tax. R&D tax relief, by contrast, can produce a cash credit in some cases. The two are separate reliefs with their own rules, and a company may be able to benefit from both.
“The Patent Box is designed to encourage companies to keep and commercialise intellectual property in the UK. It allows companies to apply a lower rate of Corporation Tax to profits earned from its patented inventions.”
Source: HMRC guidance on the Patent Box. Crown copyright material, reproduced under the Open Government Licence v3.0.
Who Can Benefit From The Patent Box?
In general, a UK company that is liable to Corporation Tax and makes a profit from exploiting patented inventions may be able to benefit, provided it meets HMRC’s conditions. The main requirements are that the company:
- is liable to Corporation Tax;
- makes a profit from exploiting patented inventions;
- owns, or holds an exclusive licence in, a qualifying patent; and
- has undertaken qualifying development in relation to the patent.
Which Patents Qualify?
A patent granted by the UK Intellectual Property Office or the European Patent Office may be a qualifying patent. Patents granted by certain other countries in the European Economic Area may also qualify, namely Austria, Bulgaria, Czech Republic, Denmark, Estonia, Finland, Germany, Hungary, Poland, Portugal, Romania, Slovakia, and Sweden.
Note: This list is as set out on HMRC’s website at the date of this article. It can change, so it is worth checking the current position before relying on it.
Does The Patent Box Apply To Worldwide Sales?
In many cases, yes. Because the relief reduces the Corporation Tax of a UK company that is liable to UK Corporation Tax, a single qualifying patent (for example, a UK patent) may bring profits from worldwide sales of the patented product into the Patent Box. For Patent Box purposes, there is no need to hold a patent in every country where the product is sold. What matters is that the qualifying profits arise in the UK company that holds, or exclusively licenses, the patent and meets the other conditions.
What If My Company Is Part Of A Group?
Additional rules apply where a company is part of a group – for example, around actively owning the patented invention and taking a significant role in managing the patent portfolio. This is one of the areas where the scheme becomes more complex, and where we would work alongside a Patent Box tax specialist.
What Profits And Income Can Qualify?
Not all of a company’s profit qualifies – only profit from certain activities connected to the patented invention. HMRC sets out the qualifying activities, which include selling patented products (and products that incorporate the patented invention), licensing or selling patent rights, and certain damages or compensation. Manufacturing and service companies can also qualify through a notional royalty.
“Not all of your company profits may come from exploiting patented inventions. To class profits as intellectual property income, they must come from at least one of the following activities: selling patented products (including the patented product itself, products incorporating the patented invention, and bespoke spare parts), licensing out patent rights, selling patent rights, infringement income, or damages, insurance or other compensation related to patent rights. Companies in the manufacturing and service sectors can generate qualifying income for the Patent Box if they manufacture using a patented process or provide a service using a patented tool. In these circumstances a notional royalty can be treated as income from intellectual property.”
Source: HMRC guidance on the Patent Box. Crown copyright material, reproduced under the Open Government Licence v3.0.
Can One Patented Component Cover A Whole Product?
Often, yes. A patent covering only one part of a larger product can, in the right circumstances, bring the sales of the whole product into the Patent Box – so you may not need to patent every part. The key is that the patented part is genuinely incorporated into a single product. HMRC’s guidance gives several examples, which also show where the principle stops.
| Example (based on HMRC guidance) | The patented part | Can the whole product’s sales qualify? |
|---|---|---|
| Printer sold with its cartridge | The cartridge, which stays in the printer until empty | Yes – even if the printer itself is not patented |
| Razor sold as a single item for a single price | The blade, with a handle designed to hold it | Yes – treated as one item incorporating a patented part |
| Non-refillable medical inhaler | Any one of the sleeve, canister, or contents | Yes – the parts work together to deliver the dose |
| A “system” of items linked wirelessly, sold as one unit | The patented system | Yes – the whole system is treated as a single item |
| DVD player bundled with a patented DVD | The DVD, which is removed after use | No – the DVD is not incorporated into the player |
| Sandwich in patented long-life packaging | The packaging, which extends shelf life | No – only the income from the packaging itself qualifies |
These examples are based on HMRC’s guidance at CIRD220190.
Two important limits apply. First, where a product is really a bundle of separable items and only some are patented, the income usually has to be split on a just and reasonable basis. Second, qualifying as income is only the first step: the 10% rate applies to your “relevant IP profit” after deductions, not to all the profit from the product. We explain that in the How much can the Patent Box save? section below.
Which Innovations Can The Patent Box Apply To?
The Patent Box can apply both to brand-new products you patent and to patentable improvements you make to existing products. In each case, the profits may qualify if you can obtain a qualifying patent and meet the other conditions.
New Products
If you develop a new product and can obtain a qualifying patent for it, the profits from that product may be eligible for the Patent Box. This is often the most straightforward case.
Improvements To Existing Products
You may already have a commercially successful product, improve it, obtain a qualifying patent for the improvement, and potentially bring the profits from the improved product into the Patent Box. There is an important caveat: if the existing product has already been sold or made public, that may affect whether the improvement can be patented, because a patent generally requires novelty over anything that has been disclosed in a non-confidential manner. We can assess both the original and the improved version and give you a view on whether the improvement may be patentable.
What Patent Strategy Works Best For The Patent Box?
There is no single best strategy; it depends on your commercial goals. For Patent Box purposes, a patent only needs to cover the invention, or even just part of the product or service, that you want to bring into the scheme. A narrower patent might therefore be enough. A single qualifying patent may be sufficient, and holding several patents over the same product may not increase the size of the benefit.
This creates a genuine trade-off. A broad patent gives stronger protection against competitors but is usually harder, slower and more expensive to obtain. A narrow patent is often easier, quicker, and more certain to obtain, which can matter when your main aim is to support a Patent Box claim.
Three Common Approaches
- A single broad patent, intended to serve both purposes: strong protection against competitors and a Patent Box benefit.
- A narrower, more focused patent, which may be easier, quicker, or more certain to obtain where the main aim is to support a Patent Box claim.
- Both, with one patent aimed at protection and another, narrower, aimed at supporting the Patent Box claim. The second patent is about improving the chance of securing a qualifying right, not about multiplying the tax saving.
Being Proactive: Start From Your Most Profitable Products
Two more forward-looking approaches are worth considering:
- Start from your most profitable products. It can be worth reviewing your existing profit streams, identifying the products or processes that earn the most, and directing real innovation and patenting effort towards those areas with the Patent Box in mind. Where a profitable product is not yet protected, there may be a patentable improvement that could bring its profits into the scheme.
- Let patentability inform development. When developing new products, it helps to consider early on what may be patentable, so that genuine new developments can be shaped around protectable innovations.
It is also worth thinking about how the product or service may change in the future, so that the patent application can be drafted with that in mind.
How Much Can The Patent Box Save?
The Patent Box can reduce the Corporation Tax on qualifying profits from the 25% main rate to 10% – a difference of up to 15 pence for every £1 of qualifying profit. But it does not apply to all your profit. The 10% rate applies only to your “relevant IP profit”, which is what is left after HMRC’s calculation strips out a routine return, a return attributable to marketing and branding, and applies an “R&D fraction”. Working that figure out is a job for a Patent Box tax specialist, and it is usually well below total profit.
A company that does not pay the full main rate – for example a smaller company whose profits fall within the 19% small profits rate or the marginal relief band – would see a smaller saving for each £1 of relevant IP profit. The exact figure in that case is more involved, because of how the relief is calculated, and is a matter for the company’s tax adviser.
The examples below are illustrative only and assume the 25% main rate applies.
| Relevant IP profit (per year) | Tax at 25% | Tax at 10% (Patent Box) | Saving that year | Indicative maximum over 20 years |
|---|---|---|---|---|
| £100,000 | £25,000 | £10,000 | £15,000 | up to around £300,000 |
| £200,000 | £50,000 | £20,000 | £30,000 | up to around £600,000 |
These figures are illustrative only. They assume the 25% main rate applies, the same relevant IP profit every year for 20 years, the patent kept in force for the full term, the company continuing to qualify, and the scheme continuing to apply in broadly the same way. Real profits vary from year to year, so treat the 20-year figures as a theoretical maximum, not a forecast or a promise.
HMRC publishes a fuller worked example in its Patent Box calculation guidance. Patent and accountancy costs should also be weighed against the saving, and specialist tax advice should be taken before relying on any figures.
How Long Does The Benefit Last, And Can It Be Backdated?
The benefit can last for as long as the patent is in force, which is typically up to 20 years from the patent application’s filing date, assuming the scheme continues to apply in broadly the same way. The benefit can only be claimed once a qualifying patent has actually been granted, but it may, in limited circumstances, reach back to profits earned before grant.
Backdating Before Grant
The Patent Box may reach back to profits earned during the period from the patent application to grant, up to a limit of six years before grant. This is not automatic. It is only available if the company had already elected into the Patent Box for those earlier accounting periods (within the usual time limits) and makes a further election. The relief for those earlier profits is then given in the accounting period in which the patent is granted, rather than by amending earlier tax returns. The timing of these elections matters, so this is an area for specialist tax advice.
How Can You Get To Grant Sooner?
Because the benefit only starts if and when the patent is granted, it can be worth trying to reach grant sooner, so that the relief begins earlier. The UK patent application process can often be accelerated – for example through the Patent Prosecution Highway or by requesting accelerated search and examination. We explain several acceleration options in our guide to accelerating UK patent prosecution.
Conclusion
The UK Patent Box can be a valuable, and often overlooked, reason to protect your innovations. A granted patent is not only a way to keep competitors at bay; it may also reduce the Corporation Tax your company pays on the profits from that innovation.
The detail matters, though. The relief is not automatic, it applies only to your relevant IP profit rather than all your profit, and the tax calculations are genuinely complex. That is why we work alongside specialist Patent Box tax advisers: we focus on the patent strategy and on securing qualifying patents, and they handle the tax side.
One of our consultant patent attorneys, Ben Hoyle, has in previous roles – separately from his work at Russell IP – overseen Patent Box claims that resulted in multiple multi-million pound tax savings, so it is an area we understand well from the patent side. If you are exploring whether your inventions could support a Patent Box claim, or you would like help obtaining a qualifying patent, contact Russell IP today for a free, no-obligation discussion, and we can introduce you to specialist Patent Box tax advisers where helpful.
Disclaimer: This article is general information, not legal or tax advice. For tailored guidance, please contact Russell IP.
Frequently Asked Questions About The UK Patent Box
What is the UK Patent Box?
The UK Patent Box is a Government tax scheme that lets a company apply a reduced 10% rate of Corporation Tax to profits from patented inventions, instead of the main rate of 25%. It was introduced in phases from 2013 to encourage companies to keep and commercialise intellectual property in the UK. Russell IP can help on the patent side and introduce you to Patent Box tax specialists for the tax aspects.
Who can claim Patent Box tax relief?
A UK company that is liable to Corporation Tax, makes a profit from exploiting patented inventions, owns or exclusively licenses a qualifying patent, and has undertaken qualifying development may be able to claim Patent Box tax relief. The company must also elect into the scheme. Whether you qualify depends on your circumstances, so specialist advice is recommended.
Does the UK Patent Box apply to worldwide sales?
In many cases, yes. A single qualifying patent, such as a UK patent, may bring profits from worldwide sales of the patented product into the UK Patent Box, provided those profits arise in the UK company that holds or exclusively licenses the patent. There is generally no need to hold a patent in every country where you sell.
Do I need to patent my whole product to benefit from the Patent Box?
No. A patent covering only one component can sometimes bring the sales of a whole product into the Patent Box, provided the component is genuinely incorporated into a single product. HMRC’s examples include a patented printer cartridge qualifying the sale of the whole printer. There are limits, however, and the relief applies only to the relevant IP profit, not to all of the product’s profit.
How much Corporation Tax can the UK Patent Box save?
The UK Patent Box can reduce the rate on qualifying profits from 25% to 10% – a saving of up to 15 pence for every £1 of qualifying profit. The saving applies only to “relevant IP profit”, which is usually less than total profit after HMRC’s deductions, so the real saving is smaller than a simple 25% versus 10% comparison. The exact figure depends on your circumstances and is a matter for your tax adviser.
Can I claim the Patent Box before my patent is granted?
Not directly. The relief can only be claimed once a qualifying patent is granted. However, profits earned while the patent was pending may, in limited circumstances, be brought into the claim in the year of grant – reaching back up to six years – but only if the company had already elected into the Patent Box for those earlier years. This is not automatic, and the timing of the elections matters.
Is the UK Patent Box the same as R&D tax relief?
No. The Patent Box and R&D tax relief are separate reliefs with their own rules, although a company may be able to benefit from both. The Patent Box reduces Corporation Tax on profits from patented inventions, while R&D tax relief supports the cost of qualifying research and development. Russell IP can advise on the patent side, while a tax adviser should advise on both reliefs.
Can Russell IP help with the Patent Box?
Yes, on the patent side. Russell IP can help you assess whether a patent strategy might support a Patent Box claim, obtain qualifying patents (including more quickly where helpful), and we can introduce you to specialist Patent Box tax advisers for the tax calculations and the claim itself. We are patent attorneys, not tax advisers, so the tax advice should come from a qualified tax specialist.
