California Civil Code section 1550 gives a four-part validity test
Capable parties
Legal capacity for this agreement
Consent
Free, mutual, communicated assent
Lawful object
Legal, possible, ascertainable performance
Consideration
A sufficient bargained exchange
A California contract requires parties capable of contracting, their consent, a lawful object, and sufficient cause or consideration. Those are the four elements in Civil Code section 1550. A proper writing, signature, definite terms, delivery, contingencies, and performance can still matter, but they answer different formation or enforceability questions. For the exam, test the four statutory elements first and never add notarization, recording, or an earnest-money deposit to the list.
California Legislative Information, Civil Code sections 1549 and 1550 · checked 2026-08-27The four elements, in the statute's order
| Order | Element | Legal job | Exam question |
|---|---|---|---|
| 1 | Parties capable of contracting | Each party must have the legal capacity relevant to the agreement | Who is promising, and can that person or entity make this contract? |
| 2 | Their consent | Consent must be free, mutual, and communicated by each to the other | Did the parties agree to the same thing in the same sense without a consent defect? |
| 3 | A lawful object | What the agreement requires must be lawful, possible, and sufficiently ascertainable | What must be done or not done, and may the law recognize that objective? |
| 4 | Sufficient cause or consideration | The bargain needs a legally recognized exchange or inducement | What benefit, promise, act, forbearance, or detriment supports each promise? |
A writing is a separate gate
DRE notes that a proper writing may be useful as an additional requirement for certain contracts. It is not part of Civil Code section 1550's four-item list. Post 68 will own the California Statute of Frauds, including which real estate agreements must be written and signed for enforcement.
Capacity starts with the legal party, then the signer
Natural person
Age, understanding, adjudicated status, and any legal restriction affect contracting power
Entity
Confirm the corporation, LLC, partnership, trust, or estate is correctly identified and the signer has authority
Representative
Separate the principal's capacity from the agent's authority to sign for that principal
Property ownership
Capacity to hold title is not always the same as capacity to make the contract or convey without approval
DRE cautions that unemancipated minors and persons lacking the legally required understanding present special limits. A minor or person under a conservatorship may still acquire property through a gift, inheritance, or court-supervised process. Do not jump from ownership to unrestricted contracting power.
Do not let an agent stand in for missing capacity
An agent can act only within valid authority for a principal who can be bound through that arrangement. A broker cannot repair a party's capacity problem simply by signing as the party's real estate agent. Guardianship, conservatorship, trust, estate, and entity transactions require their own authority documents and approvals.
Consent must be free, mutual, and communicated
Mutual consent means the parties agree to the same thing in the same sense and communicate that assent. Free consent asks whether the apparent agreement was produced without a legally material mistake, fraud, duress, menace, or undue influence. A signature is strong evidence of assent to the document, but it does not make every consent defect disappear.
Mistake
A material misunderstanding can prevent or impair genuine agreement, depending on whether it concerns fact or law and who knew
Fraud
A material deception can make apparent assent different from informed consent
Duress
Unlawful pressure or confinement can deprive a party of free will
Menace
A qualifying threat can make consent unfree
Undue influence
Unfair use of confidence, authority, weakness, necessity, or distress can corrupt consent
Offer and acceptance get their own article
This element establishes the target: shared, communicated assent. Post 70 will own expiration, revocation, rejection, counteroffers, mirror-image acceptance, and communication rules. Keeping those mechanics separate prevents this validity guide from becoming a second offer-and-acceptance article.
The object is what the contract requires the parties to do or not do
Lawful
The objective cannot violate an express law, the policy of express law, or another applicable legality rule.
Possible
The promised performance must be possible and capable of being ascertained by the time the agreement requires performance.
Ascertainable
The object must be determinable with enough certainty to know the promised performance and apply a remedy.
If an agreement has a single unlawful object, the problem reaches the entire bargain. When it has distinct lawful and unlawful objects, severability and the governing statute can change the result. Post 67 owns the consequence labels; here the job is to classify the object accurately.
Consideration is the bargain, not the deposit
Promise for promise
In a bilateral purchase contract, the buyer's promise to buy and the seller's promise to sell on agreed terms can support one another. No immediate exchange of cash is required to recognize those promises as consideration.
Benefit or detriment
Civil Code section 1605 describes consideration through a benefit conferred or agreed to be conferred, or a prejudice suffered or agreed to be suffered, as an inducement to the promise.
| Fact | Is it necessarily consideration? | Reason |
|---|---|---|
| Earnest-money deposit | Not required as a fifth element | Mutual promises can support the purchase contract even when the deposit is zero or delivered later |
| Broker services | Can support the bargain | Promised or rendered licensed services can be exchanged for a principal's compensation promise |
| A gift promise with no exchange | Usually not a bargained exchange | A pure gratuitous promise presents a different consideration problem from a bilateral real estate bargain |
| Unlawful payment | Cannot rescue the agreement | Consideration and object must both satisfy applicable legality rules |
Eight validity scenarios, one element at a time
1. A competent buyer and seller agree on a lawful purchase
Both understand the property, price, and exchange, and each makes enforceable promises.
All four elements appear
Next ask separate questions about writing, signatures, definiteness, conditions, and enforceability.
2. The buyer never paid an earnest-money deposit
The signed agreement contains mutual promises, but no deposit was delivered.
Consideration can still exist
The buyer's promise to buy and seller's promise to sell can supply consideration. A deposit is not a fifth validity element.
3. The parties sign different price versions
Buyer signs at one price, while seller signs a version with a changed price that buyer never accepts.
Consent problem
They have not shown agreement to the same thing in the same sense. Post 70 will own offer, counteroffer, and acceptance mechanics.
4. A signer represents an LLC without authority
The LLC can contract, but the individual signer was never authorized to bind it.
Authority problem, not necessarily entity incapacity
Identify the real party and the signer's power before deciding whether the entity is bound.
5. The agreement requires an illegal use
The bargain calls for conduct prohibited by law and that conduct is its single object.
Unlawful object
A court does not turn a prohibited objective into a lawful contract merely because consideration changed hands.
6. The property description cannot identify any parcel
The writing names no address, legal description, parcel, or workable method to determine the property.
Object and definiteness concern
The subject must be sufficiently ascertainable. Do not confuse this with a missing signature or capacity defect.
7. A party signs after a material threat
The apparent agreement was produced by coercive facts that deprived the party of free choice.
Free-consent defect
Identify the defect first. The legal consequence belongs to the separate void, voidable, and unenforceable analysis.
8. The broker promises services and the seller promises compensation
The employment agreement exchanges performance promises without an immediate cash transfer.
Promise-for-promise consideration
Consideration is the bargained exchange, not necessarily money paid when the agreement is signed.
Use a six-step validity diagnostic
- 1
Parties
Name every legal person or entity and each representative
- 2
Capacity
Test age, understanding, legal status, entity existence, and signer authority separately
- 3
Consent
Find offer, acceptance, shared terms, communication, and freedom from a material consent defect
- 4
Object
State exactly what performance is promised and test legality, possibility, and ascertainability
- 5
Consideration
Trace the benefit or detriment supporting each side of the exchange
- 6
Separate gates
Only after the four elements, test writing, signature, definiteness, conditions, defenses, and remedies
Eight California contract-validity traps
A writing is the fifth element
False. Civil Code section 1550 lists four elements. A writing can be a separate enforceability requirement for particular contracts.
Notarization makes a contract valid
False. Notarization verifies an acknowledgment or signature function in contexts that require it. It does not create capacity, consent, lawful object, or consideration.
Recording is required for contract validity
False. Recording addresses notice and priority for recordable instruments, not the four elements of every contract.
No deposit means no consideration
False. Mutual promises can provide sufficient consideration even when no earnest money is delivered.
The purchase price is the only consideration
False. Consideration is the exchanged legal benefit or detriment supporting promises, not one number viewed alone.
Capacity and authority are identical
False. An entity may be capable of contracting while a particular signer lacks authority to bind it.
A signature proves free consent
False. A signed document can still present mistake, fraud, duress, menace, or undue-influence issues.
Every flaw makes a contract void
False. Different flaws produce different consequences. Post 67 owns the void, voidable, valid, and unenforceable comparison.
Start with existence, then test enforceability
Four elements, then separate gates
Use the Contracts area to place validity beside formation, writing, offers, options, liquidated damages, and California-specific agreement rules.
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