2025 Session Last amended: 2024 session

§ 336.2-202 — Final Written Expression; Parol or Extrinsic Evidence

Plain-Language Summary

A written contract that the parties intended as final cannot be contradicted by earlier oral or written agreements. However, it can be explained or supplemented by course of dealing, trade usage, course of performance, and (if the writing is not a complete agreement) consistent additional terms.

Practical Notes
If you have a written sales contract, you generally cannot claim the deal was different based on earlier conversations, but trade customs and past dealings can help explain the written terms.