Meaning
Legal doctrines prevent a party from using a duty they already owe as consideration for a new agreement. Application of the pre-existing contract rule ensures that a person cannot demand more money or equity for doing what they were already legally bound to do. This rule governs the validity of mid-term contract amendments and stops applying if the parties add new duties or change the circumstances of the work.
Consideration Requirement
Valid contracts require an exchange of value from both sides. Under the pre-existing contract rule, a founder promising to finish a product they already agreed to build is not giving anything new. This prevents one party from holding a project hostage to extract better terms at a critical moment.
Modification Constraint
Changing a signed agreement requires a clear record of what new value is being provided. When a founder seeks a higher salary because the work is harder than expected, the pre-existing contract rule may void the increase unless the job description also expands. A written record of the new responsibilities protects the change from being overturned.
This ensures that every amendment to the founding documents is backed by a fresh exchange.
Dispute Prevention
Understanding the limits of contract changes helps avoid unenforceable verbal promises. The rule protects the company from claims made by partners who feel they deserve more for their original roles. The cost of ignoring this principle is a legal challenge that could unravel years of corporate history.
