Read end-to-end by a FundingAtlas editor against the official source.
Quick answer
Patent Box is a 10% effective UK corporation-tax rate on profits attributable to patented products, processes and licences. It is a long-term incentive for companies commercialising their own IP, not a one-off grant. Election is voluntary, requires detailed streaming calculations, and works best alongside R&D Tax Relief. Most useful for profitable trading companies with UK or EPO-granted patents generating meaningful revenue; rarely worth the compliance cost below roughly £250k of qualifying profit.
Funding amount
10% effective Corp Tax rate
Region
United Kingdom
Stage
Established
Provider
HMRC
Advisor view
Patent Box is a finance, IP and engineering process. Companies that succeed treat the patent strategy and the R&D cost-tracking system as one workflow from the outset.
Frequently asked questions
- What is Patent Box?
- Patent Box is a UK corporation-tax election that applies a 10% effective rate to profits attributable to qualifying patented IP — patents granted by UKIPO, EPO or specified EEA equivalents.
- Is it automatic?
- No. Election is voluntary and made within 2 years of the end of the accounting period in which the profit arises.
- Who is Patent Box for?
- UK corporation-tax payers that own or exclusively licence qualifying patents and earn profit from products, processes or licences embodying those patents — most useful for profitable companies with granted patents that materially differentiate the product.
- Who is it not for?
- Companies without granted patents, those with IP held offshore, or those whose patented invention does not contribute materially to product profit.
- What is the modified Nexus regime?
- Nexus ties the relief to in-house R&D spend on the underlying IP — robust R&D cost-tracking from inception is essential to a defensible Nexus fraction.
- Why do Patent Box claims fail?
- Filing patents too late, weak Nexus tracking, inability to attribute profit to the patented component, or election made before the patent is granted.
- How does Patent Box interact with R&D Tax Relief?
- The two reliefs interact through the Nexus fraction — they are not mutually exclusive but cannot be combined naively. Take specialist advice.
- When should we elect?
- Once the company has commercial profit attributable to qualifying patents and has the Nexus and streaming tracking in place. Election must be within 2 years of period-end.
- What ongoing work does Patent Box require?
- Streaming and Nexus tracking must be refreshed annually. Patent Box is a long-term workflow, not a one-off filing.
- Where are the official rules?
- The official guidance is on gov.uk under the Patent Box pages. Rules — particularly the modified Nexus regime — are technical. This is not tax advice.
Who it's for
UK corporation-tax payers that own or exclusively licence qualifying patents and earn profit from products, processes or licences embodying those patents.
Probably not for you if…
Companies without granted patents, those whose IP is held offshore, or those whose patented invention does not contribute materially to product profit.
Usually too early when
Advisor signal
You have only filed a patent application — Patent Box requires the patent to be granted (though once granted, qualifying profits during the pending period can be brought into the first claim).
Eligibility
UK company subject to corporation tax; owns or exclusively licences qualifying patents; meets the Nexus / development condition; formally elects into the regime within 2 years of the end of the accounting period in which the profit arises.
Evidence you'll need
Patent grant certificates, licensing agreements, R&D expenditure records to satisfy the modified Nexus fraction, streaming/sub-streaming workings, and a Patent Box election in the company tax return.
Application timeline
Election within 2 years of period-end. First-year computations can take 2–6 months given the Nexus tracking and streaming requirements. HMRC enquiry windows apply as for any CT600 claim.
Common reasons applications fail
Filing for the patent too late to capture early commercial profit, weak Nexus tracking, inability to attribute profit to the patented component, or election made before the patent is actually granted.
What improves your odds
Patent filings made early in the product roadmap, robust R&D-cost tracking from inception, and a clear product–patent mapping maintained jointly by finance and engineering.
Typical successful applicant
A UK-based product, hardware, biotech, materials or medtech company with one or more granted UK/EPO patents that materially differentiate the product, generating £500k+ of patented-product profit annually.
Common misconceptions
Patent Box is not automatic — you must elect. It does not apply to copyright, trademarks or unregistered design rights. It cannot be combined naively with R&D Tax Relief; the two interact through the Nexus fraction.
What happens next
Once elected, the 10% rate applies to qualifying profits each year until the company opts out. Streaming and Nexus tracking must continue annually.
What comes next
Patent Box companies typically expand into international IP filings, increase R&D Tax claims, and pursue Innovate UK Smart Grants or Innovation Loans to fund the next product generation.
Funding context
Patent Box rewards the commercialisation phase of the R&D lifecycle and is most powerful when paired with sustained R&D Tax Relief claims and Innovate UK grant funding earlier in the cycle.
Related routes
- Patent Box vs R&D Tax Relief
- Patent Box vs RDEC
- Patent Box or R&D Tax Relief?
- Patent Box vs holding IP offshore
- Which R&D funding route is best?
- Should I claim R&D Tax Relief or apply for a grant?
- R&D Tax & Reliefs Pathway
- Innovation Funding Pathway
- R&D Tax Relief for SMEs
- R&D Expenditure Credit (RDEC)
- Innovate UK Smart Grants
Objectives
Regions