Understanding Contract Types in California: A Guide to Oral, Written, and Implied Agreements
- Yakup Sari, Esq.

- Feb 24, 2025
- 2 min read
Updated: Mar 12, 2025
Contracts form the foundation of business, employment, and personal agreements in California. While most people assume contracts must be written to be valid, California law recognizes various types of agreements, including oral and implied contracts. Understanding the different contract types can help individuals and businesses navigate their legal rights and responsibilities.
1. Oral vs. Written Contracts
In California, contracts can be either written or oral—both are legally enforceable under state law. While written agreements provide clear evidence of the terms, oral contracts are equally valid under California Civil Code § 1622. However, proving the existence and terms of an oral contract can be challenging.

When Does a Contract Need to Be in Writing?
The Statute of Frauds (California Civil Code § 1624) requires certain contracts to be in writing to be enforceable, such as:
Agreements that cannot be performed within one year;
Contracts involving real estate transactions;
Promises to pay someone else's debt;
Contracts for the sale of goods over $500;
If a contract falls under the Statute of Frauds and is not in writing, it may be unenforceable in court.
2. Partially Written and Partially Oral Contracts
Contracts can also be partially written and partially oral, meaning some terms are documented while others are agreed upon verbally. Courts in California recognize such contracts, but enforcing the oral portions may require supporting evidence, such as witness testimony or past business practices.
3. Implied-in-Fact Contracts
An implied-in-fact contract is created through the actions and conduct of the parties rather than through explicit words. California Civil Code § 1619 states that an implied contract holds the same legal weight as an express contract.
For example, if a freelancer provides services to a client without a written agreement but consistently receives payment, an implied-in-fact contract may exist. Courts determine the existence of such contracts based on the behavior of the parties.
4. Unformalized Agreements
Sometimes, parties may agree to contract terms verbally or informally with the intention of later drafting a formal agreement. If both parties intended to be bound before signing a final written contract, the agreement may still be enforceable. However, if the parties expressly state that they will not be bound until a contract is signed, there is no legally binding agreement.
5. The Parol Evidence Rule and Contract Disputes
California follows the parol evidence rule, which generally prohibits using outside evidence (oral or written) to contradict or add to a fully integrated written contract. However, there are exceptions, such as:
Fraud or misrepresentation
Clarifying ambiguities in the contract
Proving a separate agreement that does not contradict the written terms
Understanding this rule is essential in contract disputes, as it determines what evidence a court will consider.
Conclusion
Contracts in California take many forms—written, oral, and implied. While written contracts are easier to enforce, oral and implied contracts can also be legally binding. However, specific agreements must be in writing to comply with the Statute of Frauds. To avoid disputes, individuals and businesses should clearly document their agreements and seek legal advice when necessary.
If you're dealing with contract formation or enforcement issues in California, consulting with Sari Law Firm`s experienced breach of contract attorneys can help ensure your rights are protected.




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