A Norwalk corpus case shows what happens when a party argues an LD clause is unreasonable without presenting any evidence on commercial custom, anticipated harm, or bargaining power -- the presumption holds and the clause is enforced. Shows the seven-factor evidentiary burden and what kind of evidence moves a court off the presumption.

Challenging an LD Clause? Bring Evidence or Don't Bother

You're representing the party on the wrong end of a liquidated damages clause. Your instinct is to argue that the number is too high and the court should see through it. That instinct will lose if it stays in the brief and never makes it into a declaration.

The Clause

What the Law Requires

California Civil Code § 1671(b) places the burden squarely on the challenger: a commercial LD clause "is valid unless the party seeking to invalidate the provision establishes that the provision was unreasonable under the circumstances existing at the time the contract was made."

That language is not just procedural allocation. It reflects a policy judgment that commercial parties who agreed to a damages clause -- typically with lawyers, with information, and with options -- should be held to their bargain. Overturning that bargain requires affirmative proof, not argument.

The burden requires evidence on factors including:

Commercial custom in the relevant industry for clauses of this type
The anticipated harm from the specific breach that occurred
The collection risks or uncertainty the non-breaching party would have faced without the clause
The delayed-payment or breach-specific losses the non-breaching party was protecting against
The bargaining power of the parties at contracting
Whether there was oppression or surprise in the inclusion of the clause
Any facts showing the provision was unlawful at the time it was made

A challenge that lives entirely in the briefs -- that argues the amount is excessive without evidence on any of these factors -- will fail.

What the Corpus Shows

The Norwalk corpus anchor is a clean illustration of what happens when the challenger does not carry its burden. In May 2026, the Los Angeles Superior Court (Norwalk Dept. L) considered a challenge to a prejudgment interest LD clause. The challenging party filed briefs. What the party did not file was evidence -- no declarations from contract law experts or industry practitioners, no economic analysis of what the non-breaching party's anticipated harm range was at contracting, no showing of unequal bargaining power or form-contract adhesion. The court's finding was direct: "Defendant has offered no evidence to overcome the presumption in Civil Code section 1671, subdivision (b) that liquidated damages terms are valid." The clause was upheld. The motion for prejudgment interest was granted.

The Norwalk decision is a useful pre-trial planning tool. The seven-factor list the court implicitly applied functions as a checklist: if you cannot populate each factor with evidence, you should assess realistically whether you have a viable challenge at all -- or whether your resources are better spent on negotiating a settlement.

What Counsel Does

If you are the enforcing party:

When the challenger offers only brief argument and no evidence, identify the gap explicitly and early. In your motion for summary adjudication, establish the commercial presumption under § 1671(b), then identify what the challenger has and has not offered in response.
The argument to make at summary adjudication: the burden never shifted because the challenger produced no evidence. The presumption holds. The clause is valid as a matter of law.
Attach the contracting-side evidence to your motion -- not because you bear the burden, but because it forecloses any argument that the challenger could have developed. Documentation of the parties' representation by counsel, the commercial context, and the deal size relative to the clause amount is straightforward to assemble and makes the motion airtight.
On the timeline: move for summary adjudication on the LD issue separately if possible. Isolating the issue early -- before the case goes deep into discovery -- forces the challenger to reveal whether they have any evidentiary foundation or are simply hoping the clause falls on its own.

If you are the challenging party:

Retained expert, not a brief. The Norwalk failure mode was pure argument. To avoid it, retain a contract law expert or industry practitioner who can testify to commercial custom for comparable clauses in the relevant industry at the time of contracting. That is the foundational evidence the court needs.
Commission an economic analysis of the anticipated harm range from the specific breach. This is the core of the Gormley first-factor challenge: what could the non-breaching party have reasonably anticipated losing from this type of breach, and how does the clause amount compare?
If bargaining power was unequal or the clause appeared in a form contract with no negotiation opportunity, develop a factual record on both. Internal communications, negotiation history, and the original contract markup are the starting point.
If you cannot populate the seven-factor checklist with actual evidence after a genuine effort, have an honest conversation with your client about the likelihood of success and the cost-benefit of the challenge.

This article is for educational purposes only and is not legal advice. All frameworks and sample language should be reviewed by a licensed attorney and adapted to your particular client, case, and situation.