California Civil Code Section 1671 sets the rules for when a liquidated damages clause will hold up in court, and it treats consumer and non-consumer contracts very differently. In a non-consumer contract, the clause is presumed valid, and the party trying to escape it must prove the amount was unreasonable when the contract was signed. In a consumer contract, the presumption flips: the clause is void unless the party enforcing it proves the amount was reasonable at the time of contracting.1California Legislative Information. California Civil Code 1671 Which side of that line your contract falls on often decides the dispute before anyone looks at the dollar figure.
Which Contracts Count as Consumer Contracts
Section 1671 defines two categories of consumer contracts. The first is a retail purchase or rental of personal property or services for personal, family, or household use. The second is a lease of real property used as a dwelling by the tenant or the tenant’s dependents.1California Legislative Information. California Civil Code 1671 Anything that doesn’t fit one of those two buckets is non-consumer: business-to-business deals, commercial leases, construction contracts, and similar agreements.
That classification does the heavy lifting. It sets the presumption, and the presumption sets who has to build a case and who gets to sit back.
The Non-Consumer Test Under Section 1671(b)
For non-consumer contracts, Section 1671(b) uses one test: the liquidated amount must have been reasonable under the circumstances existing when the parties made the contract. Courts do not measure the clause against what actually happened after the breach. They measure it against what the parties could reasonably have anticipated at signing.2California Legislative Information. California Civil Code 1671
The California Supreme Court’s decision in Ridgley v. Topa Thrift & Loan Assn. illustrates how that plays out. A lender charged what it called a prepayment fee, but the charge kicked in only when the borrower was late on interest payments. The court looked past the label, found the provision was really a penalty for late payment rather than compensation for prepayment, and struck it down because the charge bore no relationship to the damages the lender would actually suffer from a late interest payment.3Justia. Ridgley v. Topa Thrift and Loan Assn.
The court’s broader holding: a forfeiture or unreasonable penalty imposed only on the other party’s default is unenforceable, even if the same amount could have been validly bargained for as part of the contract’s performance. Renaming a penalty as a fee will not save it.3Justia. Ridgley v. Topa Thrift and Loan Assn.
The Consumer Test Under Section 1671(d)
Consumer contracts face a tougher standard. Under Section 1671(d), a liquidated damages clause is invalid unless the party trying to enforce it affirmatively proves the amount was reasonable when the contract was signed.1California Legislative Information. California Civil Code 1671 A landlord, retailer, or service provider needs documentation showing how the chosen number relates to their anticipated losses. Without that showing, the clause fails.
Residential late fees are the everyday example. Because a lease of real property used as someone’s home is a consumer contract, any late fee has to survive the 1671(d) reasonableness standard. California has no statutory dollar cap on late fees, so the amount is often the whole fight. Courts have generally accepted fees in the 5 to 10 percent range of monthly rent as reasonable; fees above 15 percent are routinely challenged as penalties. A landlord who cannot connect the fee to the actual administrative costs of a late payment risks losing it entirely.
Residential Property Purchases Get Their Own Rules
Home purchase agreements are governed by a separate framework in Civil Code Sections 1675 through 1678. These rules apply to residential property of four or fewer dwelling units where the buyer intends to occupy one of the units.4California Legislative Information. California Civil Code 1675 A five-unit building or an investor purchase falls outside these sections, and the general 1671(b) standard governs instead.5California Legislative Information. California Civil Code 1676
The Three Percent Presumption
A seller can retain the buyer’s deposit as liquidated damages if the buyer fails to close, but the presumption of validity extends only up to 3 percent of the purchase price. At or below that threshold, the buyer must prove the amount is unreasonable to challenge it. Above 3 percent, the burden flips and the seller must prove the amount was reasonable.4California Legislative Information. California Civil Code 1675 On a $700,000 home, that means a deposit held as liquidated damages is presumptively safe up to $21,000.
Formatting and Signing Requirements
Even a reasonable dollar amount will not save the clause if it fails Section 1677’s formatting rules. The liquidated damages provision must be separately signed or initialed by each party. If the clause appears in a printed contract, it must be set in at least 10-point bold type, or in contrasting red print in at least 8-point bold type.6California Legislative Information. California Civil Code 1677 Burying the clause in standard fine print without separate initials will render it unenforceable no matter how reasonable the amount.
For non-residential real property that doesn’t qualify under Section 1675, the separate signing and formatting requirements of Section 1677 still apply, but the reasonableness test reverts to the general 1671(b) standard. The seller doesn’t get the 3 percent presumption.5California Legislative Information. California Civil Code 1676
Sale of Goods
Contracts for the sale of goods are covered by California Commercial Code Section 2718, which defers to Civil Code Section 1671 for the enforceability standard.7California Legislative Information. California Commercial Code 2718 There is no separate or more lenient test for goods. If the clause fails 1671, the seller falls back on standard breach-of-contract remedies.
What Happens When a Court Strikes the Clause
When a California court finds a liquidated damages provision unenforceable, the clause is void. Courts do not reform it or reduce it to a reasonable figure. The predetermined number disappears, and the non-breaching party must prove actual damages through litigation. For obligations to pay money, the measure of damages is the amount owed plus interest.8California Legislative Information. California Civil Code 3302 For other types of breaches, proving actual harm can be expensive and uncertain. A drafter who reached for an aggressive number can end up with nothing to enforce.
Drafting a Clause That Will Survive
Because reasonableness is measured at the time of contracting, the best evidence is whatever existed at that moment. Document your reasoning before the ink dries, not after a breach.
- Put the harm estimate in writing. If you’re a software vendor and a client’s breach would cost six months of reassigned developer time, record those salary figures. If you’re a landlord and a broken lease means two months of vacancy plus advertising, write that down.
- Explain why actual damages would be hard to prove. Courts are more forgiving where real losses involve reputational harm, lost opportunities, or disrupted business relationships. Note those difficulties explicitly.
- Keep the number proportional to the harm you described. A clause set at four times the contract’s value invites scrutiny. If the math doesn’t hold up on a napkin, a court won’t find it reasonable either.
- Use separate signatures or initials on the clause. Section 1677 requires this for residential property purchases, and it’s a strong practice everywhere else because it defeats an argument that the clause was buried.
- Make the clause conspicuous. Bold type, a separate paragraph, a clear heading. A provision hidden on page 47 of dense boilerplate looks like something one party slipped past the other.
None of these steps guarantees enforceability, but together they build the record courts want to see. A drafter who can point to a contemporaneous memo explaining the damages estimate stands on very different ground than one trying to justify the number after the breach.
Does the Non-Breaching Party Still Have to Mitigate?
A frequent question is whether the non-breaching side must mitigate damages when the contract has a valid liquidated damages clause. California courts generally say no. The parties traded the opportunity to calculate actual damages for the certainty of a fixed amount, and requiring mitigation would reintroduce the uncertainty the clause was meant to eliminate.
If the clause is valid, the non-breaching party can collect the agreed amount without showing they tried to reduce their losses. This is another reason courts insist on reasonableness at signing: because the number won’t be adjusted downward later, it has to be defensible from the start. If you’re on the paying end, arguments like “they could have found another tenant” or “they could have resold the goods” will not usually reduce what you owe under a valid provision.