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The Daily Insight

What is the parol evidence rule?

Author

Emily Wong

Updated on February 17, 2026

What is the parol evidence rule?

What is the Parol Evidence Rule? In general, the parol evidence rule prevents the introduction of evidence of prior or contemporaneous negotiations and agreements that contradict, modify, or vary the contractual terms of a written contract when the written contract is intended to be a complete and final expression of the parties’ agreement.

Does parol evidence apply to contractual interpretation?

Instead, contractual interpretation is purely a judicial function. Accordingly, when a contract can be (and legally should be) interpreted on its face, juries are not supposed to get involved. Anytime a written contract is at issue, trial lawyers should evaluate the impact the parol evidence rule has on what evidence a jury should hear.

When is parol evidence inadmissible in California?

Userware International, Inc. (1993) 11 Cal.App.4th 631, 637 [when a contract is fully integrated, “parol evidence is inadmissible even to add terms NOT inconsistent with the writing.” ] Emphasis added. EPA Real Estate Partnership v. Kang (1992) 12 Cal.App.4th 171 is a good case study on how trial courts should apply the parol evidence rule.

What is the parol rule in contract law?

The Parol Evidence Rule. The Gatekeeper of Evidence in Contract Cases By Mark B. Wilson, P.C. The parol evidence rule has nothing to do with convicted criminals getting out of prison early. Instead, it governs how trial courts are supposed to decide which evidence to exclude from the jury in cases involving contract interpretation.

Why judge Corbin opposes the parol evidence rule?

Judge Corbin opposes the parol evidence rule, stating that due to the complex nature of the changing relationships between parties who contract with each other, one can never be sure of when there is a complete expression of the agreement. As such, the law should recognize negotiations that may modify, explain, or supplement the contract

Should parol evidence be admissible in contract negotiations?

Some have argued that parol evidence should be admissible, as it may reflect ideas agreed upon by both parties but left out of the contract for some reason (possibly in bad faith by one party).

Can parol evidence be used at trial in California?

A majority of states today no longer use the parol evidence rule, meaning that courts in those states will allow parties to introduce parol evidence at trial. Most recently, the California Supreme Court held in Riverisland Cold Storage v.