A legal transfer of intellectual property rights from an individual to the company. All founders and contributors should assign IP created for the startup to the company entity. Investors will not fund startups where individuals own key IP. Covers code, designs, inventions, and content.
IP assignment
noun — A written legal agreement by which an individual transfers ownership of intellectual property to another party — typically a company. In the startup context, IP assignment ensures that code, designs, inventions, trade secrets, and other creative works built by founders, employees, and contractors are legally owned by the company entity rather than the individuals who created them.
Why it matters
If the founders' IP is not formally assigned to the company, the company does not actually own the technology it is built on. This is one of the most common and serious issues uncovered during due diligence. A departing founder who never signed an IP assignment agreement could claim ownership of the codebase, designs, or other critical assets.
Investors consider unresolved IP ownership a deal-breaker because it means the company's core assets are at risk. A single unsigned agreement can halt a fundraise or acquisition for months while lawyers sort out ownership — if it can be sorted out at all. In the worst cases, a disgruntled ex-founder uses unassigned IP as leverage to extract settlement payments.
Fixing IP assignment retroactively is possible but becomes harder and more expensive as time passes, especially if a founder has left on bad terms. The cleanest approach is always to handle IP assignment at the moment of incorporation, before any code is written or any designs are created.
How it works
An IP assignment agreement transfers ownership of all intellectual property created by an individual in connection with the company's business. This typically includes software code, algorithms, designs, trade secrets, inventions, content, and any other creative works. The assignment should be signed at the time the founder joins (ideally at incorporation) or when a contractor starts working on the project.
For founders, the IP assignment is usually included in the restricted stock purchase agreement or a separate Confidential Information and Invention Assignment Agreement (CIIAA). For employees, it is part of their employment agreement. For contractors, it must be explicitly included in the contractor agreement because, unlike employees, contractors retain ownership of their work by default unless there is a written assignment.
The agreement should cover both IP that has already been created and IP that will be created in the future. It should also include a list of any prior inventions the person wants to exclude from the assignment. Some states, like California, have laws limiting what employers can claim — specifically excluding inventions made entirely on the employee's own time without company resources.
| Role | Default IP ownership | Required document |
|---|---|---|
| Founder | Individual — must assign | CIIAA or RSPA with assignment clause |
| Employee | Company (work for hire, with limits) | Employment agreement with CIIAA |
| Contractor | Individual — must assign in writing | Contractor agreement with IP assignment clause |
| Advisor | Individual — should assign any relevant work | Advisor agreement with IP assignment clause |
History and origin
IP assignment agreements have their roots in employment law and contract principles that long predate the startup era. Under U.S. copyright law, works created by employees within the scope of their employment are considered "works made for hire" and belong to the employer. However, this protection does not extend automatically to independent contractors or founders who technically employ themselves.
As technology startups proliferated in Silicon Valley in the 1980s and 1990s, law firms began standardizing IP assignment provisions into founder agreements and employment contracts. The Confidential Information and Invention Assignment Agreement (CIIAA) became a standard document in startup formation packages offered by law firms like Wilson Sonsini and Cooley. Y Combinator's standard documents, introduced in the 2000s, further standardized the practice by making IP assignment agreements available as templates for any startup to use.
Today, the failure to properly assign IP at founding remains one of the most common legal problems discovered during startup due diligence. Despite the widespread availability of template documents, many early-stage founders still skip this step — often because they formed the company informally, started building before incorporating, or simply did not know it was required. The consequences typically surface at the worst possible moment: when a term sheet has been signed and the clock is ticking on closing the round.
Frequently asked questions
What is an IP assignment agreement?
An IP assignment agreement is a legal document that transfers ownership of intellectual property from an individual — such as a founder, employee, or contractor — to the company. It ensures that the company, not the individual, legally owns the code, designs, inventions, and content created in connection with the business.
Why do investors require IP assignment before funding?
Investors will not fund a startup where key intellectual property is owned by an individual rather than the company. If a founder or contractor owns the codebase or core technology, they could hold it hostage, claim licensing fees, or walk away with it entirely. Investors conduct IP due diligence specifically to verify that all material IP has been formally assigned to the company entity.
Do contractors need to sign an IP assignment agreement?
Yes — and this is critical. Unlike employees, contractors retain ownership of their work by default under U.S. copyright law unless there is a written agreement assigning it. Even if a contractor builds your core product, they legally own that code without a signed assignment. Every contractor working on anything related to your company's business must sign an IP assignment agreement before starting work.
What is a CIIAA and who needs to sign one?
A Confidential Information and Invention Assignment Agreement (CIIAA) is the most comprehensive form of IP assignment. It assigns all IP created for the company, protects confidential information, and includes non-disclosure obligations. Every founder, employee, and key contractor should sign one. It is typically part of the employment agreement or founder restricted stock purchase agreement.
What happens if a founder did not sign an IP assignment at incorporation?
Unassigned IP can be fixed retroactively, but it becomes harder and more expensive over time — especially if the relationship has soured. The fix requires the founder to sign an IP assignment after the fact, which may require negotiation. If the founder has left the company and is uncooperative, the company may have limited legal standing to its own core technology. This is why IP assignment should be signed at or before incorporation.
What IP is excluded from assignment?
Most assignment agreements include a carve-out for prior inventions — work the person created before joining the company and that is unrelated to the company's business. Founders and employees can list specific prior projects they want to exclude. California law (Labor Code Section 2870) also exempts inventions developed entirely on the employee's own time without company resources, equipment, or confidential information.
Does IP assignment cover future inventions?
Yes. A properly drafted IP assignment covers both past IP (anything created before signing that relates to the company's business) and future IP (anything created during the person's relationship with the company in connection with the business). This forward-looking assignment is what protects the company from someone leaving and claiming ownership of work they did while at the company.
Learn more
- Founder agreements: what to include and why each clause matters
- What is a cap table and why does it matter?
- How to split equity in a startup: the complete guide
Related terms
- Founder Equity Split
- Due Diligence
- Shareholder Agreement
- Operating Agreement
- Non-Compete and Non-Solicitation
Ready to get your equity right?
Equity Matrix helps founders structure ownership correctly from day one — so your agreements protect what you build.
Get Started Free