What is the parol evidence rule?
The parol evidence rule blocks outside statements that contradict a final written contract.
Why it matters
It keeps the signed writing as the authoritative terms of the deal.
Common confusion
It bars prior contradictory words, not later amendments or clarified terms.
Frequently Asked Questions
Can I use emails to explain the contract?
Only if they do not contradict the final writing.
What if the writing is incomplete?
Courts may allow outside evidence to fill gaps.
Does it apply to oral contracts?
No — only to final written agreements.