Patent Box Explained: How It Reduces Corporation Tax

Introduction

The Patent Box is a UK tax incentive designed to reward companies that successfully commercialise innovation.

While R&D Tax Relief supports the cost of developing new products, processes or software, the Patent Box applies once that innovation begins to generate profit. For many engineering, manufacturing and technology businesses, this provides a long-term reduction in Corporation Tax.

Despite this, the scheme is often underused, particularly by SMEs that assume it only applies to large or highly specialised organisations.

1. What Is the Patent Box?

The Patent Box allows companies to apply an effective 10 percent Corporation Tax rate to qualifying profits derived from patented inventions.

This includes profits generated from:

• The sale of patented products
• Products that incorporate patented components
• Licensing and royalty income
• Income generated from patented processes

HMRC guidance: Corporation Tax: the Patent Box.

It is important to note that the reduced rate applies only to qualifying IP profits, not to total company profits.

2. Who Should Consider the Patent Box?

The Patent Box is most relevant for companies that:

• Develop proprietary products or technology
• Invest in engineering or technical innovation
• Generate repeatable income from intellectual property
• Operate in sectors such as manufacturing, software, life sciences or advanced engineering

For many businesses, Patent Box eligibility follows naturally from sustained R&D activity.

3. What Profits Qualify?

Patent Box applies to qualifying IP profits, which are calculated by:

• Identifying income linked to patented products or processes
• Removing routine returns that would exist without innovation
• Removing marketing returns linked to brand or goodwill

The remaining profit reflects the value created by the patented technology.

4. What Are the Requirements?

To qualify, a company must:

• Own or exclusively license a qualifying patent
• Have contributed to the development of the patented invention
• Actively manage the intellectual property

Qualifying patents must be granted by recognised bodies such as:

• The UK Intellectual Property Office
• The European Patent Office

5. How the Patent Box Is Calculated

The calculation involves several steps:

1. Identify total profits
2. Isolate profits attributable to patented items
3. Deduct routine and marketing returns
4. Apply the Patent Box formula

The resulting qualifying IP profits are taxed at an effective rate of 10 percent, compared to the standard Corporation Tax rate of up to 25 percent.

6. Example

A company generates £600,000 in total profit, of which £350,000 relates to patented technology.

• Standard Corporation Tax at 25 percent: £150,000
• Patent Box tax on qualifying profits: £35,000
• Remaining profits taxed at standard rates

This results in a significant annual tax saving.

7. Patent Box and R&D Tax Relief

Patent Box and R&D Tax Relief are closely linked:

• R&D Tax Relief supports the cost of developing innovation
• Patent Box reduces the tax on profits generated from that innovation

A typical progression is:

• Development through R&D
• Protection through patents
• Commercialisation supported by Patent Box

For more on how the reliefs interact, see our Your Tax Relief Partners overview, or read our explanation of the merged R&D scheme.

8. Practical Considerations

Before applying the Patent Box, businesses should consider:

• Whether their innovation is patentable
• The timing of patent applications
• How profits will be tracked and allocated
• Whether systems support the required calculations
• How the structure aligns with long-term growth

If You Do Not Yet Have a Patent

If your business is developing something that could justify patent protection, but you do not currently have a patent in place, it is worth addressing this early.

We can introduce you to a trusted patent attorney partner who can:

• Assess whether your innovation is patentable
• Guide you through the application process
• Help ensure the structure aligns with future Patent Box eligibility

9. What Businesses Should Do Next

Businesses should:

• Review current and historic R&D activity
• Identify potentially patentable innovations
• Consider early engagement with a patent attorney
• Assess future profitability linked to IP
• Build IP strategy into wider tax planning

Property-based investment can also be reviewed alongside this work — see our Embedded Capital Allowances service for more.

Lexmore’s View

The Patent Box is most effective when considered early in the lifecycle of innovation.

For businesses investing in technical development, it provides a structured way to reduce Corporation Tax over the long term.

When combined with R&D Tax Relief, it forms part of a broader strategy that supports both development and commercialisation.