Diminished Value Calculator & Loss Delta Auditor
Audit insurance 17c formula settlement caps against real-world dealer market comparables under Restatement of Torts § 928, verify 50-state tort recovery rights, and generate formal demand letters.
Diminution of Value Claim & 17c Formula Audit Standards
1. Vehicle & Jurisdiction
Enter pre-loss vehicle value and state to check statutory eligibility.
Kelley Blue Book / Edmunds private party value.
Final itemized body shop invoice total.
Carriers often open negotiations with a 17c formula figure ($1,300). Real-world dealership trade-in records and private sales data typically reveal a loss of $4,550. In California, the legal measure of recovery is actual market loss, not internal insurance formulas.
California Statutory Claim Rights
Step-by-Step 17c Formula Breakdown
10% applied to pre-accident value ($32,500)
Moderate Body & Mechanical (0.50)
20,000 – 39,999 mi (0.8x)
* Note on 17c limitations: The 17c formula automatically zeros out claims for vehicles exceeding 100,000 miles and caps all claims at 10%, regardless of whether real market data proves a higher loss. Independent dealer comps are essential to counter lowball 17c settlement offers.
Third-party diminished value recovery is established under tort property restitution and state case law.
How Diminution of Value Claims Work in US Auto Insurance
Understanding the difference between the 17c formula and actual market depreciation standards.
The 17c formula originated in 2001 from a Georgia class-action settlement (State Farm Mutual Automobile Insurance Co. v. Mabry, 274 Ga. 498). Insurance carriers adopted this framework nationwide because it imposes an artificial 10% base ceiling on vehicle loss and scales down payout amounts using strict mileage and subjective damage multipliers.
Outside of Georgia first-party claims, 17c is not statutory law. In 49 states, third-party tort claims against an at-fault driver are governed by common law property restitution, where the measure of damages is actual reduction in open-market value supported by dealer comparables.
Third-Party Claims (Other Driver at Fault): In all 50 US states, when another driver causes damage to your vehicle, their Property Damage Liability coverage is legally obligated to compensate you for physical repairs as well as the inherent loss in market resale value.
First-Party Claims (You at Fault or Hit-and-Run): Standard ISO personal auto policies exclude diminished value under collision coverage. Georgia is the single US jurisdiction where insurers are legally mandated to pay first-party DV to their own policyholders.
Diminished Value Claims & 17c Calculation FAQ
What is a Diminution of Value (DV) auto insurance claim?
A Diminution of Value (DV) claim seeks financial recovery for the permanent reduction in a motor vehicle market resale value caused by an accident history record (such as CARFAX or AutoCheck), even after all physical and cosmetic damage has been fully repaired to industry standards.
How much will my car depreciate after an accident?
A vehicle typically loses between 10% and 25% of its pre-accident market resale value following a reported collision with structural or mechanical damage, depending on vehicle age, luxury tier, and the severity of the repaired damage recorded on CARFAX or AutoCheck.
How do you calculate diminished value on a car after an accident?
Diminished value can be calculated using either the insurance 17c formula (which caps recovery at 10% of base ACV and applies damage/mileage modifiers) or the Dealer Market Delta method under Restatement (Second) of Torts § 928 (which compares actual advertised retail dealer listings of clean-history vehicles against accident-history comparables).
What is the 17c formula used by insurance adjusters for DV claims?
The 17c formula is an insurer-developed calculation derived from the 2001 Georgia class action State Farm v. Mabry. It applies a base 10% cap to the vehicle pre-accident market value, and then reduces that figure using subjective damage severity (0.00 to 1.00) and mileage multipliers (0.0 to 1.0). In 49 states, 17c is an internal insurance negotiation baseline and is not binding law.
Can you file a diminished value claim against the at-fault driver?
Yes. In virtually every US state, an innocent vehicle owner has the statutory right under tort law property restitution to file a third-party diminished value claim against the at-fault driver Property Damage Liability insurance. Because the other driver was negligent, their insurer is legally required to make the claimant whole for all property losses, including lost resale value.
Can you file a diminished value claim against your own insurance policy?
In 49 states, standard personal auto insurance contracts (such as ISO Form PP 00 01) explicitly exclude first-party diminution of value claims under comprehensive and collision coverages. Georgia is the sole exception, where the landmark Supreme Court ruling (State Farm Mut. Auto. Ins. Co. v. Mabry) requires insurers to assess and pay first-party DV on covered collision losses.
What evidence is needed to prove diminished value to an insurance adjuster?
To successfully prove diminished value, compile a 5-point evidence package: (1) itemized collision repair invoice detailing structural/frame work, (2) 3 clean-history dealer comps showing pre-loss retail value, (3) 2–3 accident-history dealer listings showing market depreciation deltas, (4) a written trade-in deduction statement from a franchised dealership, and (5) a formal written demand citing state tort statutes.
Can you recover rental car costs or loss of use during diminished value claims?
Yes. Under third-party tort law in most states, the at-fault insurer is liable for both the inherent loss in vehicle market value and the reasonable rental vehicle reimbursement (loss of use) for the full duration required to complete repairs.
Is my vehicle or claim information uploaded to any server?
No. All calculations, 17c formula modeling, state law lookups, and demand letter generation execute 100% locally in your device browser memory via client-side JavaScript. Zero claim numbers, names, VINs, or personal details are uploaded or stored on any server.
Related Guides & Interactive Audit Tools
Should I File a Car Insurance Claim or Pay Out of Pocket? (Math & State Rules)
Comprehensive vs Collision Insurance: What Each Actually Covers
Loss of Use Car Insurance Claims: 50-State Rules & Rental Per Diem Guide
Calculate 17c formula estimates, compare dealer market deltas, and generate a formal demand letter.
Model out-of-pocket repair costs versus long-term insurance surcharges and CARFAX value loss.
Compare State Regulations to Other States
This calculator evaluates diminished value loss baselines using the 17c formula (State Farm v. Mabry) and dealer market comparable price deltas under Restatement (Second) of Torts § 928 principles. We do not provide certified appraisal reports or legal advocacy. Demand letters are pro se requests authored directly by the vehicle owner. Third-party tort recovery rights and jurisdictional small claims limits vary by state statute.