What is an IP assignment agreement and when do I need one?
By SuLe · Updated 15 July 2026
An IP assignment agreement is a written, signed contract that transfers ownership of intellectual property from the person who created it to your company. You need one whenever a non-employee makes IP your business relies on — contractors, agencies, advisors and the founders themselves for pre-incorporation work — because ownership does not pass to you automatically.
Key facts
- A copyright assignment must be in writing and signed by the assignor to be valid (CDPA 1988 s.90).
- Employees' work vests in the company automatically (s.11(2)); contractors' does not — they need an assignment.
- One assignment can cover both existing and future IP created under an engagement.
- Moral rights cannot be assigned, only waived — a good assignment includes a waiver.
- A bare invoice or email does not transfer ownership, however clearly it is worded.
When does my startup need an IP assignment?
Whenever someone outside your payroll creates something the company depends on. The classic cases are a freelance developer, a design agency, a fractional CTO, an advisor producing content, and a founder who built a prototype before the company existed.
Employees are the exception. Their in-scope work belongs to the company automatically, so they need a confirming IP clause in their contract rather than a separate deed.
Get assignments in place early. It is far easier to make signing a condition of the engagement than to chase a former contractor for a signature years later — usually when an investor's lawyers have just asked for it.
What makes an IP assignment legally valid?
At minimum, for copyright the assignment must be in writing and signed by the assignor — the person giving up the rights — under CDPA s.90. Patent and patent-application assignments also need to be in writing. A verbal promise or an "all rights transferred" note on an invoice does not do the job.
Beyond the bare legal minimum, a solid assignment does five things. It identifies the work; assigns present IP; assigns future IP created under the engagement; waives the author's moral rights; and includes a "further assurance" clause promising to sign anything else needed to perfect the transfer.
That "further assurance" promise matters because it lets the company get later signatures — for example on a patent filing — without renegotiating.
What does an IP assignment actually cover?
| Element | What it does | Why it matters |
|---|---|---|
| Assignment of existing IP | Transfers what has already been created | Moves ownership to the company today |
| Assignment of future IP | Captures work made during the engagement | Avoids a fresh document for each deliverable |
| Consideration | The value given (often £1, or the fee) | Helps make the transfer effective |
| Moral-rights waiver | Waives the author's personal rights | Lets you adapt and use the work freely |
| Further assurance | Promise to sign whatever else is needed | Perfects patent or overseas filings later |
Copyright itself needs no registration in the UK — it arises automatically on creation and lasts the author's life plus 70 years. The assignment is what moves that automatically-arising right from the creator to your company.
How does an assignment differ from a licence?
An assignment transfers ownership; a licence only grants permission to use. If a contractor licenses their code to you, they still own it — they can license it to others, and you depend on the terms they set.
For anything core to your product or brand, you want assignment, not a licence. Investors and acquirers expect the company to own its key IP outright, and a licence — especially a non-exclusive or revocable one — is a red flag in due diligence.
Licences have their place for third-party tools and open-source components, where you are genuinely using someone else's work under their terms. The rule of thumb: own what defines you, license what supports you.
Worked example
Tom and Rebecca run a healthtech startup, VitalPath Ltd. They engage a freelance developer, Idris, to build their patient-onboarding module for £9,000.
Their contract with Idris includes an IP assignment: it assigns all present and future IP in the module to VitalPath, waives Idris's moral rights, and adds a further-assurance clause. When VitalPath later files a patent on part of the workflow, that clause lets them get Idris's signature on the filing paperwork without a fresh negotiation. Because assignment was built in from day one, their diligence pack shows clean ownership — no scramble, no repricing, no awkward call to a developer who has long since moved on.
Where founders go wrong
Treating an invoice as an assignment.
Ownership needs a written document signed by the creator (CDPA s.90) — an invoice is not it.Getting a licence when they needed ownership.
A licence leaves the IP with the contractor; core product IP should be assigned.Forgetting the moral-rights waiver.
Moral rights can't be assigned, only waived — without it, an author can object to how you use the work.Leaving future work uncovered.
Assign future as well as existing IP so ongoing deliverables vest automatically.
Related questions
When does my startup actually need an IP assignment?
Whenever someone who is not an employee creates IP the company relies on: contractors, freelancers, agencies, advisors, and the founders themselves for anything built before incorporation. Employees' work vests automatically, so they need a confirming clause rather than a separate assignment. [More: Who owns the IP my employees and contractors create?]
What has to be in the document to be valid?
For copyright it must be in writing and signed by the assignor — the person giving up the rights (CDPA s.90). Good practice is to identify the work, assign present and future IP, waive moral rights, and include a "further assurance" promise to sign anything else needed later.
Can one assignment cover future work?
Yes. An assignment can transfer both existing IP and IP created in the future under the engagement, so a contractor's ongoing output vests in the company as it is made. This is why building assignment into the contract at the start beats a one-off transfer later.
What are moral rights and should they be waived?
Moral rights are an author's personal rights — chiefly to be identified as author and to object to derogatory treatment of the work. They cannot be assigned, only waived, so a good assignment includes a moral-rights waiver to avoid awkward claims over how you use or adapt the work.
An IP assignment looks like boilerplate, but a missing signature or a licence where you needed ownership can unravel a funding round or an acquisition. A SuLe solicitor can draft or check your assignments so the company genuinely owns its product and brand. Book a free IP health check call and get your ownership chain watertight before it's tested.
Keep reading: Who owns the IP my employees and contractors create? · How do I transfer pre-incorporation IP into my company? · Who owns the code if an agency built my MVP? · Who owns copyright in software in the UK? · What IP protection does an early-stage startup actually need? · Do I need a consultancy agreement for a fractional CTO?
Primary sources: Copyright, Designs and Patents Act 1988 · GOV.UK — How copyright protects your work
