DefineLaw

What is a bilateral contract?

A bilateral contract is a promise exchanged for a promise.

Why it matters

Most everyday contracts are bilateral — each side promises to do something.

Common confusion

Bilateral = promise for promise; unilateral = promise for an act.

DefineLaw editors — plain-English definitions for general reference; not a substitute for advice from a licensed attorney.

Frequently Asked Questions

Give an example.

A sale: I promise to pay, you promise to deliver the goods.

Is a handshake deal bilateral?

It can be, if both sides promised something.

Does it need writing?

Only if the statute of frauds requires it for that type.

Related contract terms