Bilateral Contract
A contract in which both parties make binding promises to perform; obligations and rights flow in both directions.
While straightforward in theory, many businesses fail to actively track obligations tied to this concept - often resulting in missed deadlines, unintended renewals, penalties, or loss of contractual rights.
US Law · For business owners and foundersWhat is a Bilateral Contract?
A bilateral contract is an agreement in which both parties make binding promises to perform. Party A promises to do something, and Party B promises to do something in return. The obligations and rights flow in both directions, creating mutual duties that can be enforced by either party.
Almost every commercial contract you encounter is bilateral. An employment agreement, sales contract, service agreement, or partnership deal typically has both sides promising to do something: the employer promises to pay salary; the employee promises to work. Neither party is forced to act until the other does, but both are bound by their promises.
Bilateral contracts are distinguished from unilateral contracts, in which only one party makes a binding promise. Examples of unilateral contracts include reward offers ("I will pay $100 to anyone who returns my lost dog") or contest rules. In a unilateral contract, the other party accepts by performing, not by making a promise.
In practice, many teams rely on a contract expiry tracking system to stay on top of dates and obligations tied to clauses like this.
Key Elements
Mutual Promises
Both parties must make binding promises. Party A's promise to perform is the consideration for Party B's promise, and vice versa.Acceptance by Return Promise
Bilateral contracts are typically accepted when the other party makes their return promise, not necessarily when they perform. This is different from unilateral contracts, where acceptance happens through performance.Both Parties Have Rights and Duties
Each party can enforce the other's promise and has remedies if the other breaches. Neither party is a mere beneficiary.Consideration Flows Both Ways
Party A provides consideration to Party B (and vice versa) through their promises. The value being exchanged makes the contract enforceable.Conditions Precedent May Apply
A bilateral contract can include conditions (e.g., "we will pay only if you deliver on time"). Performance of one party's obligation may be conditioned on the other's.Real-World Example
You hire a contractor to renovate your office for $50,000. The contractor promises to complete the work by June 30; you promise to pay in full upon completion. Both parties have exchanged binding promises.
This is a bilateral contract. The contractor's promise to complete the work is consideration for your promise to pay. If the contractor fails to finish, you can withhold payment and sue for damages. If you refuse to pay on completion, the contractor can sue you. Both parties have mutual enforceable rights and duties.
This is why many businesses adopt automated deadline tracking to ensure no critical dates are missed before they pass.
Sample Clause Language
Bilateral Promises in a Service AgreementWatch Out For
Duty to mitigate when other party breaches
If the other party breaches their bilateral promise, you have a duty to mitigate damages - you cannot sit idle and allow losses to pile up. You must take reasonable steps to minimize harm.Conditions precedent can excuse performance
If the contract makes your performance conditional on the other party performing first (e.g., "we will pay when you deliver"), you can refuse to perform until they uphold their end.Both parties can sue for breach
In a bilateral contract, either party can initiate breach litigation. If you are in any breach yourself, this weakens your claim significantly.Material breach versus minor failure
Not every failure in a bilateral contract is a material breach. If the other party substantially performs or commits a minor breach, you may still be obligated to perform your side.Don't let bilateral contract deadlines catch you off guard
Key dates tied to bilateral contracts - renewal windows, expiry cutoffs, notice periods - can easily slip through the cracks when tracked manually. Missing them triggers automatic extensions, penalties, or lost rights. ExpiryEdge tracks every critical deadline and sends automated reminders before they're due - so nothing slips.
Instead of relying on spreadsheets or manual follow-ups, a centralized renewal reminder system ensures every deadline is visible, tracked, and actioned automatically.
How to Use This in Your Favor
Make promises specific and measurable
Vague bilateral promises create disputes. Use concrete, measurable terms: delivery date, quality standards, payment amounts, and timelines.Establish conditions precedent strategically
If you want the other party to perform first, state it explicitly: "Client shall pay [amount] within 10 days of delivery. Delivery is conditioned on receipt of payment for prior milestones."Define what constitutes acceptable performance
Specify your performance standards clearly (e.g., "services will meet industry standard best practices"). This prevents disputes about whether you have upheld your promise.Reserve the right to terminate if other party materially breaches
Include language allowing you to stop performing and terminate if the other party materially breaches. Without this, you may be forced to keep performing even if the other side stops.Related Terms
Frequently Asked Questions
What is the difference between a bilateral and unilateral contract?
In a bilateral contract, both parties make binding promises to perform. In a unilateral contract, only one party makes a binding promise; the other accepts by performing an action. Most business contracts are bilateral.
How is a bilateral contract accepted?
A bilateral contract is typically accepted when the other party makes their return promise. You do not need to wait for them to perform - the agreement becomes enforceable as soon as both parties have promised.
Can I refuse to perform a bilateral contract if the other party breaches first?
If the other party materially breaches, you may have grounds to stop performing and terminate. However, if they commit only a minor breach or if your performance is not conditioned on theirs, you may still be obligated to perform.
Are bilateral contracts more enforceable than unilateral?
No - both types are fully enforceable. However, bilateral contracts are more common in business because they create mutual obligations and ensure both parties are committed.