Diminished Value Claim Calculator
Your car is worth less after an accident even when it is repaired perfectly. This free calculator shows what is a diminished value claim worth under the 17c formula insurers use, walks through how to file a diminished value claim, and explains why the formula's number is your negotiation floor, whether you are in Texas, Florida, or anywhere else.
Quick answer: Insurers calculate diminished value with the 17c formula: 10% of the vehicle's pre-accident value as a hard cap, multiplied by a damage modifier (0 to 1.00) and a mileage modifier (zero at 100,000+ miles). That number is the insurer's own floor, not the market's, and documented demands backed by an independent appraisal often settle higher.
Estimate Your Diminished Value (17c Formula)
Upload your documents and let the calculator read them
Attach the body shop repair estimate or final repair invoice (PDF, JPEG, PNG, or WebP, up to 4 files, 8MB each). The amounts are extracted into the calculator automatically.
Your files are read once to extract the amounts and are not stored.
What your car was worth the moment before the crash. Use the KBB or NADA private-party or retail value for your exact year, trim, and condition.
Odometer reading at the time of the accident. 17c discounts hard for mileage and zeroes out at 100,000 miles.
Moderate damage to the structure and panels: measurable structural repair plus bodywork, but short of major frame damage.
Enter your car's pre-accident value and mileage above to see the 17c estimate with a full step-by-step breakdown.
Upload Your Repair Estimate and Check the Offer Against the 17c Floor
The calculator above can read your body shop repair estimate or final repair invoice directly, so the repair total comes from the document instead of memory. Once your vehicle's pre-accident value is entered, the tool shows the repair-to-value ratio, a useful early signal: higher ratios usually mean structural involvement, and structural work is what drives the damage modifier that controls most of the claim's value under 17c. If the ratio climbs high enough, the insurer may declare the car a total loss instead, a different claim with its own math; see our guide to the totaled vehicle payout if that is where your claim is heading. The tool never picks the damage severity for you. Read the repair lines yourself and look for frame, unibody, or rail work before you choose a level.
If the insurer has already made you an offer, type it into the offer check and compare it to the 17c figure. The comparison is unusually clean in this claim: 17c is the insurer's own formula, so its output is the floor of any honest negotiation. An offer below the 17c number is below the industry's own math and says the adjuster is counting on you not to know it. An offer at the 17c number is the starting point, not the finish line; an independent appraisal or written dealer quotes are how you support the higher figure your car actually lost.
What Is a Diminished Value Claim?
A diminished value claim compensates you for the gap between what your car was worth before an accident and what it is worth after it has been fully repaired. The repair fixes the metal; it does not fix the record. The accident now appears on the vehicle history report, and buyers and dealers pay less for a car with an accident history than for an identical car with a clean one. That difference is a real, compensable property loss, separate from the repair bill itself.
There are three recognized types. Inherent diminished value is the stigma loss: the market simply pays less for a car with an accident on its record, even after flawless repairs. This is the type most claims involve and the one the calculator above estimates. Repair-related diminished value is additional loss caused by imperfect repairs, such as mismatched paint, aftermarket parts, or panels that no longer align. Immediate diminished value is the drop in resale value right after the crash and before repairs, a measure used mostly in litigation rather than in insurance negotiations.
In most states the claim is made against the at-fault driver's liability insurer, not your own carrier, because first-party policies generally exclude diminished value. That framing matters: you are a third-party claimant the insurer owes no contractual duty to, which is exactly why a documented written demand, rather than a phone call, is how these claims get paid.
The Formula: 10% of ACV x Damage Modifier x Mileage Modifier
Under 17c, diminished value starts at 10% of the vehicle's pre-accident actual cash value, a hard cap the industry calls the "base loss of value." That base is then multiplied by a damage modifier from 0.00 to 1.00 and a mileage modifier from 0.0 to 1.0. For example, a $28,000 car with major damage to structure and panels (0.75) and 45,000 miles (0.6) produces $28,000 x 10% x 0.75 x 0.6, which is $1,260. Remember that this is the insurer's own formula and it discounts twice, so treat the output as the floor of the negotiation, not the value of your loss.
The 17c Formula Explained: Modifiers, Origin, and Criticisms
The 17c formula was developed by State Farm after the Georgia Supreme Court's decision in Mabry v. State Farm Mut. Auto. Ins. Co., 274 Ga. 498 (2001), which held that insurers must assess diminished value on first-party claims in Georgia. The name comes from the claim paragraph number, 17c, in that case. From there the formula spread across the industry, and today most adjusters reach for it whenever a diminished value demand lands on their desk, in every state, first-party or third-party.
The formula has three parts. First, the base loss of value: 10% of the car's pre-accident actual cash value, and never more. Second, a damage modifier that scales the base by structural severity. Third, a mileage modifier that discounts by the odometer, all the way to zero at 100,000 miles.
| Damage Severity | Modifier |
|---|---|
| Severe structural damageFrame or unibody damage requiring major structural repair | 1.00 |
| Major damage to structure and panelsSignificant structural repair combined with panel replacement | 0.75 |
| Moderate damage to structure and panelsMeasurable structural repair plus bodywork | 0.50 |
| Minor damage to structureLight structural pull or minor rail and apron repair | 0.25 |
| No structural damage / replaced panels onlyCosmetic or panel-only repair; 17c pays nothing | 0.00 |
| Mileage at Accident | Modifier |
|---|---|
| 0 to 19,999 miles | 1.0 |
| 20,000 to 39,999 miles | 0.8 |
| 40,000 to 59,999 miles | 0.6 |
| 60,000 to 79,999 miles | 0.4 |
| 80,000 to 99,999 miles | 0.2 |
| 100,000+ miles | 0.0 |
The criticisms are substantial, and you should raise them in your demand. The 10% cap has no market basis; nothing about the used-car market says stigma loss stops at one tenth of a car's value. The formula double-discounts: mileage already reduced the actual cash value you started from, and then the mileage modifier discounts it again. And the 100,000-mile cutoff declares that high-mileage cars lose nothing to accident history, which any dealer will tell you is false. Courts did not create 17c and no statute requires it; it is an insurer's settlement tool. Present its output as "what your own industry's formula produces" and pair it with an independent appraisal or dealer quotes showing the real number.
How to File a Diminished Value Claim, Step by Step
Step 1: Document the repairs. Collect the full repair estimate and the final repair invoice, and make sure they identify structural work explicitly. The damage modifier, and therefore most of the claim's value under 17c, turns on whether the shop documented frame, unibody, or structural repair rather than describing everything as bodywork. Get the vehicle history report showing the accident is now on the record, because that report is the loss.
Step 2: Get a valuation. Establish your pre-accident actual cash value with KBB or NADA figures for your exact year, trim, mileage, and condition. Then establish the post-repair loss: an independent diminished value appraisal is the strongest evidence, and two or three written dealer trade-in quotes acknowledging the accident history are a practical, low-cost alternative. Run the 17c number with the calculator above so you know the floor the adjuster will start from.
Step 3: Submit a written demand to the at-fault driver's insurer. The demand letter should establish fault, attach the repair records, history report, and valuation evidence, state a specific dollar amount, and set a deadline to respond. A written, documented demand creates a paper trail, signals you understand the claim, and is what adjusters actually evaluate. You can have a licensed attorney draft the demand for a flat fee so the liability framing and the valuation argument are done right the first time.
Pro Tip: The Georgia Exception Is the Origin Story
Georgia is the one state where insurers must proactively assess diminished value on first-party claims, a duty that comes from Mabry v. State Farm Mut. Auto. Ins. Co., 274 Ga. 498 (2001), the very case the 17c formula is named after. Georgia drivers can claim diminished value from their own carrier without waiting for a third-party fight. Everywhere else, expect to present the claim to the at-fault driver's liability insurer, and expect to be the one who raises it: no adjuster outside Georgia is required to bring it up for you.
Diminished Value Claim in Texas
A diminished value claim in Texas is made against the at-fault driver's liability insurer. If another driver caused the crash, their carrier is responsible for the full measure of your property damage, and that includes the loss in your car's market value after repairs, not just the repair bill. Texas courts have long recognized that a repaired vehicle can be worth less than it was before the crash, and liability insurers in Texas negotiate these claims routinely.
What Texas generally does not give you is a first-party diminished value claim: standard Texas auto policies pay to repair or replace your car under collision coverage, and that coverage is generally understood not to include inherent diminished value. So if you were at fault, or the other driver was uninsured and you claim under your own collision coverage, expect no diminished value recovery from your own carrier unless your policy language says otherwise.
Practically, a Texas claim looks like the process above: document the structural repairs, establish the pre-accident value, get an appraisal or dealer quotes, and send a written demand to the at-fault carrier. Texas adjusters will reach for the 17c number first, so arrive knowing what it produces and with market evidence supporting more.
Diminished Value Claim in Florida
A diminished value claim in Florida follows the same third-party framing: the claim is presented to the at-fault driver's liability insurer, which is responsible for the property damage its insured caused, including the market value your car lost by carrying an accident history. Florida's no-fault system applies to injury benefits, not to property damage; vehicle damage claims in Florida still run on fault, so the at-fault carrier is the right target for a diminished value demand.
As in most states, Florida drivers should not expect their own collision coverage to pay inherent diminished value on a first-party claim; the policy promise is repair or replacement, and carriers read it that way. That makes establishing the other driver's fault the first task, because your entire diminished value claim rides on it. Police reports, photos, and witness statements that pin liability are as important to this claim as the valuation evidence.
Florida's used-car market is large and history reports are checked on virtually every sale, so the stigma loss is easy to demonstrate with dealer quotes. Build the same package: repair records showing structural damage, pre-accident value, an independent appraisal or written dealer quotes, and a documented demand letter to the at-fault carrier with a deadline to respond.
Diminished Value Claim Lawyer vs. Doing It Yourself
Most diminished value claims do not need a diminished value claim lawyer on contingency. The claim is a property damage negotiation with a paper record at its core, and for straightforward claims, clear fault, documented structural repairs, a supportable valuation, a documented demand letter is usually enough to get the at-fault carrier to a reasonable number. Contingency percentages that make sense on an injury case can consume a large share of a four-figure property claim.
The middle path is having an attorney draft the demand for a flat fee while you remain the point of contact. An attorney-drafted demand frames liability correctly, presents the 17c figure as the floor and the appraisal as the real number, and signals that you are prepared to escalate, which changes how an adjuster scores the file. That is the approach built into this page: a flat-fee, attorney-drafted demand letter presenting your diminished value claim to the at-fault insurer.
Bring in a lawyer for the full representation when the claim is genuinely contested: fault is disputed, the carrier denies that your state allows the claim, the vehicle is high-value and the loss runs five figures, or the insurer simply refuses to engage. At that point small claims court or a filed lawsuit is the lever, and the demand letter you already sent becomes the first exhibit showing you tried to resolve it reasonably.
Deadlines: The Statute of Limitations on Property Damage
A diminished value claim is a property damage claim, and every state sets a statute of limitations for property damage that runs from the date of the accident. The window varies significantly by state, and it is often a different length than the deadline for bodily injury claims arising from the same crash. If the deadline passes before you file suit, the insurer has no reason to pay anything, no matter how strong your evidence is.
Negotiation does not stop the clock. Adjusters know the deadline as well as anyone, and slow-walking a claim toward the limitations date is a familiar tactic. The practical rule: send your written demand early, keep every response in writing, and if the carrier is still stalling as the deadline approaches, file before it runs and negotiate afterward. Check your state's property damage deadline with our statute of limitations calculator before you plan the negotiation timeline.
Warning: The 17c Number Is the Insurer's Number
The figure this calculator produces is what the insurance industry's own formula generates, and that formula is built to understate the loss: the 10% cap, the stacked damage and mileage discounts, and the 100,000-mile cutoff all push the number down without any market justification. Treat it as a negotiation floor. Real recoveries depend on your state's law, proof of the other driver's fault, the at-fault policy's limits, and the strength of your appraisal evidence. This tool does not provide legal advice and does not create an attorney-client relationship. Before you accept, reject, or respond to any offer, talk to a licensed attorney in your state.
Frequently Asked Questions
How much is my diminished value claim worth?
It depends on your car's pre-accident value, its mileage, and how severe the structural damage was. The insurance industry values these claims with the 17c formula: 10% of the vehicle's pre-accident actual cash value, multiplied by a damage modifier (0.00 to 1.00) and a mileage modifier (0.0 to 1.0). For example, a $30,000 car with moderate structural damage (0.50) and 35,000 miles (0.8) produces $30,000 x 10% x 0.50 x 0.8, which is $1,200 under 17c. That figure is the insurer's number and is widely considered a floor. An independent diminished value appraisal or dealer trade-in quotes often support a higher figure, which is why documented demands tend to settle above the formula result.
What is the 17c formula and where does it come from?
The 17c formula is the insurance industry's standard method for calculating diminished value: 10% of the vehicle's pre-accident actual cash value, capped there as the "base loss of value," then multiplied by a damage modifier and a mileage modifier. It was developed by State Farm after the Georgia Supreme Court's decision in Mabry v. State Farm Mut. Auto. Ins. Co., 274 Ga. 498 (2001); the name "17c" refers to the claim paragraph number in that case. It was never legislated or endorsed by any court as the correct measure of market loss, and it is widely criticized for understating what accident history actually does to resale value.
Can I file a diminished value claim against my own insurance?
Usually not. In most states, first-party policies (your own collision coverage) do not pay diminished value, so the claim is made as a third-party claim against the at-fault driver's liability insurer. The notable exception is Georgia, where, following Mabry v. State Farm, insurers must proactively assess diminished value on first-party claims. Everywhere else, the practical rule is: if the other driver was at fault, present your diminished value demand to their carrier, and check your own state's rules before assuming your own policy owes anything.
How do I prove diminished value to the insurance company?
Three layers of evidence carry a diminished value claim. First, the repair documentation: the full repair estimate and final invoice showing structural damage, parts replaced, and the total cost. Second, a valuation: an independent diminished value appraisal is strongest, and written dealer trade-in quotes comparing your car's value with and without the accident history are a practical alternative. Third, the vehicle history report showing the accident now follows the car. Package all of it in a written demand letter to the at-fault insurer that states a specific dollar figure and a deadline to respond.
Does diminished value apply if my car is leased or financed?
Financing does not defeat the claim: you (and your lender) own the car, and the loss in its market value is still real, so a financed owner can pursue diminished value the same way an outright owner can. Leased vehicles are different, because the leasing company owns the car and any diminished value generally belongs to it, not to you, unless your lease says otherwise. Some lessees still face the loss indirectly through end-of-lease charges, so read the lease and, if the numbers are meaningful, get advice before assuming you have no claim.
How long do I have to file a diminished value claim?
A diminished value claim is a property damage claim, and every state sets its own statute of limitations for property damage, commonly in the range of a few years from the date of the accident. The deadline for property damage is often different from the deadline for bodily injury arising out of the same crash, so do not assume they match. Insurers also move slower on claims that arrive late, when repair records and valuations are harder to reconstruct. Check your state's deadline with our statute of limitations calculator and send your written demand well before it runs.
Can I upload my repair estimate to the calculator?
Yes. The calculator can read your body shop repair estimate or final repair invoice (PDF, JPEG, PNG, or WebP) and list the repair amounts it finds for your review, with a running total of the repair cost. Once your vehicle's pre-accident value is entered, it also shows the repair-to-value ratio, a useful signal because higher ratios usually indicate structural involvement, the input that drives most of the claim's value under 17c. The tool never selects the damage severity for you: check the repair lines for frame, unibody, or structural work and pick the level yourself. Files are read once for extraction and are not stored.
Is a diminished value claim worth pursuing?
For newer vehicles with structural damage, usually yes. The claim costs little to make: your repair records already exist, dealer quotes are free, an independent appraisal is a modest expense, and a documented demand letter to the at-fault insurer is a flat-fee item. Against that, even the insurer's own conservative 17c formula produces four figures on many newer cars with meaningful structural damage. The math gets weaker for older, high-mileage cars (17c pays $0 at 100,000+ miles) and for cosmetic-only repairs, where you would need market evidence rather than the formula to show a loss worth chasing.
Related Legal Tools
Turn the 17c Floor Into a Demand the Insurer Answers
A calculator gives you the insurer's number. A documented demand letter, drafted by a licensed attorney for a flat fee, is how a diminished value claim is actually presented to the at-fault carrier: fault established, repairs documented, valuation attached, and a deadline to respond.