CACI 3903J: Damage to Personal Property

A California jury asked to put a number on damaged personal property does not get to choose whichever figure the evidence makes largest. CACI 3903J sets a single default measure, allows one narrow addition to it, and caps the total. Most of the disputes that reach an economist in these cases are arguments about which of those three rules applies.

What CACI 3903J actually requires

CACI 3903J — Damage to Personal Property (Economic Damage) — applies when personal property is harmed but not destroyed. The plaintiff must prove either the reduction in the item’s fair market value or the reasonable cost of repairing it, whichever is less.

That is the whole default rule, and it is the part most often stated backwards. A repair estimate is not the measure of damages simply because it is higher than the drop in value. It is the ceiling only when it is the smaller of the two numbers.

A worked example

• Fair market value of the truck immediately before the collision: $32,000
• Fair market value immediately after, damaged and unrepaired: $19,000
• Reduction in fair market value: $13,000
• Reasonable cost of repair: $9,500

The recoverable figure is $9,500. Repair is the lesser number, so repair is the measure. An opinion that awards $13,000 here has not applied the instruction.

The exception that carries most of the argument

CACI 3903J contains a second branch that is easy to miss and frequently decides the case. Where the property can be repaired but will still be worth less after the repair than it was before the harm, the plaintiff may recover both the repair cost and the remaining difference in value.

Continuing the example above: suppose the truck, properly repaired, sells for $27,500 rather than the $32,000 it would have brought before the collision. The residual loss of $4,500 survives the repair, and 3903J allows it alongside the $9,500 repair cost — a total of $14,000.

This is the branch that supports a diminished-value claim on a repaired vehicle. It is also the branch most often abused, because the same $4,500 cannot be counted twice: once inside a pre-repair diminution figure and again as residual diminished value after repair. Adding a full repair estimate to a full before-and-after value drop is double recovery, not a combined measure.

The cap: never more than the property was worth

Whatever combination applies, the award may not exceed the property’s fair market value immediately before the harm. A $6,000 used forklift with an $8,200 repair estimate does not generate an $8,200 claim. The measure reverts to the reduction in value, and the practical question becomes what the damaged unit is worth as salvage.

Replacement cost is not a substitute for either measure. Pricing a new unit and calling the difference “damages” ignores the age, condition and remaining useful life of the item that was actually harmed.

Fair market value, as the instruction defines it

The instruction supplies its own definition, and it is narrower than everyday usage: the highest price a willing buyer would pay a willing seller, where neither is under any pressure to transact and both have reasonable knowledge of the property’s condition and qualities.

Three consequences follow for the analysis:

• Distressed sales are not evidence of value. A quick sale to clear a yard is by definition a compelled transaction.
• The buyer knows what is wrong with the item. Value after the harm is what an informed buyer pays, not what an unsuspecting one might.
• Both values are measured at the moment of the harm — not at the date of the repair invoice, and not at the date of trial.

Where 3903J stops and another instruction begins

Half of the citation errors we see in personal property cases are really the wrong instruction rather than the wrong arithmetic. The 3903 series divides the ground finely:

• CACI 3903F — damage to real property. Land and anything permanently attached to it. A different measure and a different evidentiary record.
• CACI 3903G — loss of use of real property.
• CACI 3903J — damage to personal property, short of destruction. This page.
• CACI 3903K — loss or destruction of personal property, where repair is not possible.
• CACI 3903L — personal property having special value to the owner, where market value alone does not capture the loss.
• CACI 3903M — loss of use of personal property: rental value, or the cost of a reasonable substitute, for the period the item was unavailable.

Loss of use is the one most often folded into a 3903J number by mistake. Rental of a substitute vehicle during the repair period is a real and recoverable loss — but it is recoverable under 3903M, and it has to be pleaded and proven on its own terms.

Four ways these calculations fail

1. Stacking repair cost on top of full diminution. The most common defect, and the easiest to show a jury.
2. Pricing replacement instead of measuring value. New-for-old with no adjustment for age or condition.
3. Measuring value at the wrong date. A used-equipment market that moved between the loss and the appraisal will produce a number that has nothing to do with the harm.
4. Unsupported residual diminution. The post-repair shortfall is an empirical question about resale, not an assumed percentage of the repair invoice.

What an economist adds

In a personal property case the work is narrow and evidentiary: establishing both fair market values from transaction data rather than assertion, testing the repair estimate against the value it is being compared with, isolating any residual loss that survives repair, and keeping loss of use in its own column where the instruction puts it. Where the property is business equipment, the analysis usually has to run alongside a lost profits calculation, since the downtime and the damage are separate losses arising from the same event.

If a personal property measure is contested in a matter you are handling, we are happy to look at the numbers before anyone commits to a theory.

Related: commercial litigation support · damages to real property · California economic damages. Source: the Judicial Council’s California Civil Jury Instructions.