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Patent Box Tax Relief

If your UK company holds or exclusively licenses a granted patent, you can lower your Corporation Tax rate from 25% to an effective 10% on qualifying profits through HM Revenue & Customs (HMRC)'s Patent Box regime.

Key Highlights

  • 10% Effective Tax Rate: Lowers Corporation Tax from 25% down to 10% on profits generated from patented inventions.
  • Beyond Patent Licensing: Covers profits from direct product sales, process applications, and commercialized technology—not just royalty income.
  • Works Alongside R&D Relief: R&D tax relief reduces upfront development costs, while Patent Box cuts tax on ongoing commercial profits once a patent is granted.
  • Requires Explicit Election: Relief is not applied automatically. According to HMRC statistics, fewer than 1,750 companies claim Patent Box relief annually, making it a significantly underutilized corporate tax incentive.
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Who Qualifies for Patent Box Relief?

Your company qualifies if it pays UK Corporation Tax and meets the following criteria:

  1. Holds Patent Rights: Owns or holds an exclusive license for a granted patent issued by the UK Intellectual Property Office (IPO), the European Patent Office (EPO), or qualifying EEA patent offices.
  2. Generates IP Income: Earns profits from selling products, processes, or technologies that incorporate patented rights.
  3. Meets the Development Condition: Actively participated in developing the patented invention or the product utilising it.
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Common Misconceptions

  • “It is only for large corporations.”
    Fact: Small and medium-sized enterprises (SMEs) frequently claim Patent Box relief provided they own or exclusively license qualifying patent rights.
  • “You must earn standalone licensing royalties.”
    Fact: Selling an entire product that incorporates a single patented component qualifies the relevant profit from that product sale for the reduced rate.
  • “Tax advisers apply it automatically.”
    Fact: Patent Box requires a separate formal election with HMRC and specific calculation methodologies.
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The Claim Process

  1. Submit HMRC Election: File a formal election in writing within two years of the end of the relevant accounting period.
  2. Identify Qualifying Income: Isolate income derived from patented sales, licensing, process applications, or IP damages.
  3. Calculate Relevant IP Profit: Apply HMRC’s formula (including the nexus fraction to account for historic R&D expenditure) to compute eligible profit.
  4. Apply 10% Rate: Report the deduction on your CT600 tax return to pay an effective 10% tax rate on eligible profits.

Practical Example: Industrial Equipment Manufacturer

A UK manufacturer sells industrial pump systems for £2,500 each. The system incorporates a patented energy-efficiency valve. Because the complete system relies on the patented component, eligible profits from the product sales qualify for relief.

Assuming a calculated Qualifying Relevant IP Profit of £400,000:

Metric Standard Rate With Patent Box Relief
Qualifying Relevant IP Profits £400,000 £400,000
Corporation Tax Rate 25% 10%
Tax Liability £100,000 £40,000
Direct Tax Savings £0 £60,000

When to Review Your Tax Position

Consider consulting a tax specialist if your business:

Disclaimer: This document is for informational purposes only and does not constitute formal tax advice. Eligibility depends on individual corporate circumstances. Seek advice from a qualified professional before submitting a claim to HMRC.

FAQs - UK Patent Box tax relief

The UK Patent Box regime is an HM Revenue & Customs (HMRC) tax incentive that enables companies paying UK Corporation Tax to reduce their effective tax rate from 25% to 10% on qualifying relevant IP profits. It applies to businesses that hold or exclusively license granted patents from qualifying patent offices and generate revenue from selling patented products, processes, or technologies.

No, you do not need to earn patent licensing royalties to qualify. HMRC allows companies to claim Patent Box relief on profits derived from direct commercial sales of complete products that incorporate a patented component, as well as process applications, technology sales, and patent infringement damages.

While you cannot claim the reduced 10% tax rate while a patent application is pending, you can elect into the Patent Box regime early. Once the patent is formally granted by the UK IPO, EPO, or qualifying authority, you can recover the tax relief on qualifying profits earned during the pending period (up to six years prior to grant) in the tax return for the year of grant.

R&D tax credits and Patent Box relief target different stages of the innovation lifecycle:

R&D Tax Relief: Lowers upfront costs by providing tax deductions or cash credits on early-stage research and development expenditure.

Patent Box Relief: Reduces tax on commercial profits (down to an effective 10% rate) once an invention has been patented and brought to market.

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