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Cal. COM § 3407

This is the official text of Cal. COM § 3407, part of California’s Commercial Code — california's version of the Uniform Commercial Code, governing sales, negotiable instruments, and secured transactions.

Not legal advice. This page reproduces the official text of a government statute for reference only. Laws change, and how a statute applies depends on your specific facts. For advice about your situation, consult a licensed attorney in your state.

Official statutory text

(a) “Alteration” means (1) an unauthorized change in an instrument that purports to modify in any respect the obligation of a party, or (2) an unauthorized addition of words or numbers or other change to an incomplete instrument relating to the obligation of a party.

(b) Except as provided in subdivision (c), an alteration fraudulently made discharges a party whose obligation is affected by the alteration unless that party assents or is precluded from asserting the alteration. No other alteration discharges a party, and the instrument may be enforced according to its original terms.

(c) A payor bank or drawee paying a fraudulently altered instrument or a person taking it for value, in good faith and without notice of the alteration, may enforce rights with respect to the instrument (1) according to its original terms, or (2) in the case of an incomplete instrument altered by unauthorized completion, according to its terms as completed.

Status: in_force · Read it on the official government site

About this page: Statute text is reproduced from official government publishers via the Open US Law dataset (Vaquill AI, snapshot v2026.08, CC BY 4.0). Primary legislative text like this is public domain under the government-edicts doctrine (Georgia v. Public.Resource.Org, 2020). We link every section back to its official source so you can verify it independently.