A complete breakdown of the formula Georgia insurers still use to undervalue claims — its origin, its math, its blind spots, and what every Georgia driver should know before signing a settlement.
On November 28, 2001, the Georgia Supreme Court issued a unanimous ruling in State Farm Mutual Automobile Insurance Company v. Mabry, case number S01A0982. The decision settled a question Georgia drivers had been asking for decades: when a vehicle is damaged in a covered accident and then repaired, does the insurer also owe the policyholder the difference in market value the repair history creates?
The Court's answer was yes. Even when repairs return a vehicle to its pre-loss condition, the marketplace continues to penalize that vehicle for having an accident on its history report. The Court held that the insurer is obligated to assess diminution of value "along with the elements of physical damage when a policyholder makes a general claim of loss."
Georgia courts have applied the "value loss" principle — measuring damages as the difference between value immediately before and immediately after a loss — since at least U.S. Fire Insurance Co. v. Day (1926) and Dependable Insurance Co. v. Gibbs (1962). Mabry simply confirmed it applies to first-party auto policies, too.
The Mabry case was not a single owner suing for one car. It was a certified class action covering more than 25,000 State Farm policyholders across Georgia. The trial court — the Superior Court of Muscogee County — faced a logistical problem: it had ordered State Farm to pay diminished value, but evaluating tens of thousands of vehicles individually was impractical inside a class settlement framework.
So in paragraph 17, subsection (c) of its supplemental order, the trial court approved a generic mathematical shortcut as a manageable compromise. That paragraph is the source of the name "17c." It was a courtroom administrative tool — never a scientifically validated appraisal method.
Here is where the story turns. In its March 6, 2002 ruling, the Mabry trial court ordered State Farm to "continue the use of the 17c formula" specifically for assessing first-party Georgia diminished value claims going forward. The order was directed at one insurer, on one set of policies, in one state — but the language was enough for the broader insurance industry to treat 17c as a kind of accepted practice.
Within a few years, virtually every major carrier writing auto policies in Georgia had adopted some version of the same three-multiplier structure. Some used it openly; others rebranded it. Either way, the math was identical, and the outcomes for policyholders were similarly low.
If you weren't one of the 25,000 named class members in Mabry, the 17c formula was never specifically ordered for your claim. The Court's approval of the formula was tied to the procedural posture of that class action — not to any finding that the formula produces accurate market values.
Even the language ordering State Farm to use 17c includes the qualifier "unless a change in Georgia law or regulation permits a discontinuance of that practice." The Court understood that the formula was provisional. What it did not anticipate was that insurers would still be running 17c against 2026-model-year vehicles loaded with ADAS sensors, lithium battery packs, and computer-controlled drivetrains a quarter-century later.
The lasting legal holding from Mabry is straightforward and remains binding in Georgia:
What the Court did not establish is that 17c is the only suitable methodology — or that it produces accurate numbers in any individual case.
The Georgia Insurance Commissioner has been on record for years that 17c is not a state-mandated, regulator-endorsed, or legally definitive method for calculating diminished value. The Commissioner's directive does three things every Georgia driver should know about:
If an insurer leans on 17c to lowball a claim, refuses to consider competing evidence, and then drags out the negotiation, that conduct can rise to insurer bad faith — which is illegal in Georgia under two statutes worth knowing:
Governs bad-faith conduct on first-party claims. If an insurer refuses payment in bad faith within 60 days of a proper demand, the policyholder can recover the loss plus a 50% penalty (or $5,000, whichever is greater) plus attorney's fees.
Applies to third-party motor vehicle claims. After a written demand and 60-day period, an insurer that fails in good faith to settle a clearly liable claim can be liable for the loss plus a 50% bad-faith penalty plus attorney's fees.
Insurers know about both statutes. The cynical truth of the 17c playbook is that the formula produces numbers small enough to feel like "not worth fighting over" to the average claimant — but high enough that the carrier can argue it made some offer in good faith. That gap is exactly where consumers lose money.
A documented, USPAP-compliant third-party appraisal closes that gap. It puts the insurer in a position of having to either match real market evidence or risk being held to the bad-faith standard for ignoring it.
References: Georgia Insurance Commissioner Diminished Value Directive · OCGA § 33-4-6 · OCGA § 33-4-7. Full text and links to source documents are available at diminishedvalueofgeorgia.com/17c-formula-and-why-its-not-fair.
Before dissecting the three components of 17c, it is worth zooming out. The most fundamental problem with 17c is not any one of its multipliers — it is the type of valuation it represents. There are two broad approaches to valuing a vehicle, and they produce very different results.
A predetermined result derived from a percentage or fraction of an original value. It assumes a vehicle's loss is a known function of inputs — age, mileage, damage tier — and produces a number by feeding those inputs through a fixed formula.
Examples: the IRS straight-line depreciation calculator, residual-value tables used in leasing, and the 17c formula itself.
A result established by actually examining the vehicle, analyzing comparable sales, and reading the local market. The output is a number supported by what real buyers paid for similar cars in similar condition in similar geography around the time of loss.
Examples: a USPAP-compliant appraisal, a dealer's wholesale buy figure based on auction results, an expert witness opinion in a contested claim.
After the 2008 market collapse, automobile residual values plummeted. Manufacturers who, in 2005, leased SUVs with projected lease-end values at 55% of MSRP discovered three years later that the actual market would not pay anywhere near that figure. They lost millions. The opposite happened during the 2021–2022 chip shortage and again during 2024–2025 tariff volatility: high-MPG vehicles, certain trucks, and lightly-used late-model cars suddenly traded above book values everyone had been quoting.
A calculated formula has no mechanism to adapt to those conditions. It outputs the same answer in a hot market and a cold one. A measured appraisal, by contrast, is anchored in what buyers are actually paying right now, in the relevant geography.
17c is by definition a fraction formula. The first argument against it is not any one of its components — it is the overall technique. No serious valuation discipline relies on a single fixed-coefficient formula to value an asset whose price is set by an active, fluctuating market. Real estate doesn't work that way. Equities don't. Used cars don't either.
In any insurance negotiation over diminished value, the practical reality is that the burden of proof is on the policyholder to show the insurer's number is wrong. The insurer arrives at the table with 17c. You arrive with whatever you bring. If you arrive with nothing, you settle for whatever 17c produced.
That is the gap a third-party appraisal closes. A bona-fide licensed auto appraiser delivers a measured value supported by comparable-sale data, vehicle inspection notes, and (in most cases) USPAP-compliant report formatting that holds up in negotiation, mediation, or court.
Many policyholders are familiar with the printed 17c worksheet because they've received one in the mail with their claim packet. The worksheet has spaces for J.D. Power retail value, an arithmetic 10% line, a mileage-modifier dropdown, a damage-modifier dropdown, and a final number that is almost always disappointing. The next three chapters take that worksheet apart, line by line.
The first component of 17c is called the Base Loss in Value. It is computed as a flat 10% of the vehicle's J.D. Power retail value. The number is the foundation everything else in the formula compounds on top of.
It means that under 17c, regardless of vehicle type, regardless of damage severity, regardless of model class, regardless of buyer perception in the local market — a vehicle is presumed to lose no more than 10% of its book value due to accident history. That is the cap. Even if the actual market shows a 25% drop, 17c will not output more than 10%.
The honest answer: nowhere in particular. There is no peer-reviewed market study, no actuarial finding, no published research from the Georgia Department of Insurance, no analysis from J.D. Power or Black Book or Manheim, that establishes 10% as a meaningful average for diminished value across the US auto market. It was a number selected as a manageable cap inside a class-action settlement order. That is the entire pedigree.
The 10% cap is the single biggest reason 17c outputs are so consistently below real market loss on higher-value or technology-heavy vehicles. It compresses the entire range of possible outcomes into a narrow band that conveniently favors the insurer.
The database insurers feed into 17c is now J.D. Power Valuation Services. Before 2021, the same data product was published as the NADA Used Car Guide by the National Automobile Dealers Association. J.D. Power acquired NADA's used-car-guide business and rebranded it; the underlying methodology and data sources did not change. If your claim paperwork still references "NADA value," it is the same database — under its previous name.
It is a national benchmark assembled from auction results, dealership transactions, and finance-company reporting — widely used and reasonably accurate for its intended purpose: loan underwriting and trade-in benchmarking, not diminished value.
For years, the NADA Used Car Guide's published FAQ contained a striking admission: when asked whether their values reflect a car's worth after being repaired from an accident, NADA stated, in essence, that they do not. That admission survives the rebrand — J.D. Power uses the same valuation infrastructure to do the same thing.
That paragraph is, on its own, a reasonably good description of why diminished value cannot be calculated by formula. It identifies four factors: severity, repair quality, vehicle age, and class — and notes that all four interact differently for different vehicles. The guide concludes that the proper approach is to take the car to a trusted body shop, get an opinion, and then deduct from the book value an amount that the parties agree on.
Despite that disclaimer, insurance companies use J.D. Power values as the single anchor for the entire 17c calculation. They take a database the publisher itself says cannot specifically calculate diminished value, multiply it by 10%, and present the result as a settlement offer. The internal contradiction is rarely surfaced in the claim correspondence consumers actually receive.
One additional point worth raising: most insurance claims involve private vehicle owners — not dealers. J.D. Power Retail is, by definition, the price a dealer would retail a vehicle at after reconditioning. Private owners cannot transact at retail. They sell at private-party value or trade-in, both of which are lower. Anchoring the diminished-value calculation on retail inflates the base, which ironically makes the 10% cap even more punishing on the percentage side.
The published FAQ states it directly: damage on a Mercedes affects value differently than the same damage on a Chevrolet. Luxury and exotic vehicles operate in markets where buyers are notoriously stigma-averse. A repaired panel on a Rolls-Royce Phantom is a much larger percentage hit than the same repaired panel on a Toyota Camry — because the buyer pool for the Rolls is smaller, more selective, and far more likely to demand a clean Carfax.
17c applies the same 10% to both. Treating a $500,000 grand tourer the same as a $20,000 economy sedan is, to put it gently, not how the actual marketplace operates.
J.D. Power values asks for a ZIP code on its consumer site. Multiple side-by-side tests show the same vehicle pricing the same in Beverly Hills (90210) and rural Absarokee, Montana (59001) — different climates, different demographics, different used-car economies. The ZIP code field appears to function more for analytics and ad targeting than for genuine localized valuation.
That matters for diminished value because regional buyer behavior is exactly the kind of variable that drives the post-accident discount. Convertibles depreciate differently in Miami than in Minneapolis. Four-wheel-drive trucks command a stigma premium in rural markets and a stigma penalty in dense urban ones. A national flat database has no way to model any of that.
Pulling the threads together, the Base Loss in Value component of 17c fails on at least five distinct grounds:
The second component of 17c is the Mileage Modifier — a fractional multiplier applied to the Base Loss in Value, anchored to the odometer reading. The standard table looks like this:
| Odometer | Modifier | What it does to the loss number |
|---|---|---|
| 0 miles | 1.0 | No reduction (full base loss applies) |
| 20,000 miles | 0.8 | Cuts loss by 20% |
| 40,000 miles | 0.6 | Cuts loss by 40% |
| 60,000 miles | 0.4 | Cuts loss by 60% |
| 80,000 miles | 0.2 | Cuts loss by 80% |
| 100,000+ miles | 0.0 | Wipes out the loss entirely |
Linear interpolation is used between brackets. A vehicle at 45,000 miles takes a 0.55 modifier; at 89,000 miles, 0.11. The function is monotonically decreasing — more miles equals a lower diminished-value number — and it bottoms out at zero.
The graduated mileage modifier looks reasonable on the page, but it embeds an assumption that has no support in market data: that the diminished-value impact of an accident scales linearly with odometer reading. Empirical data from comparable-sale studies and auction reports consistently shows that the dollar gap between a clean-history and accident-history car of the same year/model often holds remarkably steady through the middle of a vehicle's useful life.
In other words: a 60,000-mile clean Civic and a 60,000-mile accident-history Civic are still separated by roughly the same dollar amount as a 30,000-mile clean Civic and a 30,000-mile accident-history Civic. The 17c modifier does not reflect that. It systematically shrinks the calculated loss as miles climb, regardless of what the market is actually doing.
Here is where the math goes from questionable to genuinely indefensible. The J.D. Power retail value that feeds the start of the 17c calculation already incorporates a mileage adjustment. The database explicitly subtracts (or, less commonly, adds) a per-mile dollar amount to bring the book value to where that vehicle should sit at its specific odometer reading. That adjustment is shown right on the worksheet — usually as a line item like "Mileage adjustment: -$550."
So by the time you compute the 10% Base Loss, mileage has already been priced in. The dollar figure you have is the retail of this car at this mileage. Then 17c applies the Mileage Modifier on top of that, multiplying the loss by 0.55, 0.4, 0.2, etc.
The honest version of the calculation — applying mileage exactly once — produces $2,110. The 17c version produces $1,203. That gap is roughly $900 of recoverable diminished value erased by a duplicative penalty that has no defense in basic arithmetic.
The mileage table assigns a 0.0 modifier at 100,000 miles. Multiplying anything by zero produces zero. So under 17c, a vehicle that crosses 100k miles has, by formula, no diminished value at all — regardless of what damage it sustained, regardless of its make, regardless of what comparable accident-history vehicles are actually selling for in the market.
This is plainly wrong on its face. A 2019 Toyota Land Cruiser at 102,000 miles is still worth $50,000+ on the open market. Modern luxury SUVs, well-cared-for performance cars, and any low-volume vehicle routinely retain substantial value far past 100k. The 100k cap is a relic of an era — closer to 1980 than today — when 100,000 miles meant a vehicle was nearing the end of its serviceable life. Modern drivetrains routinely run 200k+. The cap has no current basis.
One of the underappreciated features of 17c is that its components multiply, they don't add. That structure means an inaccuracy in any single factor doesn't just contribute to the error — it amplifies the entire calculation. If the Base Loss is off by 30% and the Mileage Modifier is off by 40%, the final number isn't off by 35%; it can be off by far more, depending on the direction of the errors.
Real appraisal methodology avoids multiplicative formulas precisely because of this. A market analysis aggregates additive evidence — comp sale prices, auction averages, dealer wholesale offers — and triangulates a single output. Errors in one comp don't propagate through the other comps.
When you see a 17c output on a vehicle past 60,000 miles, the calculation is almost always producing a number meaningfully below what a market-based appraisal would conclude — and on a vehicle past 100,000 miles, it is producing $0, regardless of facts. That alone is a sign the formula has stopped describing reality.
An empirically-grounded mileage analysis would start by examining same-year/same-trim comparables in clean and accident-history conditions, then back out the actual dollar gap at different mileage points. That gap typically holds steady or even widens through middle mileage, then declines slowly at high mileage — but it does not collapse to zero, and it does not follow a clean linear ramp from 0 to 100,000.
The third and final multiplier in 17c is the Damage Modifier. It is a five-tier dropdown the adjuster selects from based on a quick read of the repair estimate:
| Modifier | Damage description (per the worksheet) |
|---|---|
| 1.00 | Severe damage to the structure of the vehicle |
| 0.75 | Major damage to structure and panels |
| 0.50 | Moderate damage to structure and panels |
| 0.25 | Minor damage to structure of vehicle |
| 0.00 | No structural damage and replaced panels |
That 0.00 row at the bottom is worth pausing on. According to 17c, if the only damage to your vehicle was a panel replacement and there was no structural component damaged, you have zero diminished value. A new fender, hood, door, or bumper cover — replaced cleanly with no frame work — is treated as identical to a vehicle that was never in an accident at all.
This conflicts with what every used-car shopper actually does at the lot: they pull up the Carfax. A reported accident of any kind shows up there. It changes the buyer pool. It changes the asking price they will accept. The notion that a panel-replacement-only repair has zero market consequence is false on its face.
The bigger issue with this component is what it doesn't address. There are entire categories of damage that affect resale value substantially, and the 17c damage modifier doesn't acknowledge any of them:
The 17c damage modifier is keyed to repair-cost-and-structural-character, but actual used-car buyers price stigma on damage character and reported severity — two related but distinct things. A $5,000 ADAS recalibration job leaves a vehicle on Carfax with the same incident severity flag as a $5,000 rear-bumper replacement, even though a third-party appraiser would assign different market discounts to each. The five-tier dropdown has no language to describe any of it.
Before moving into the modern issues — ADAS, EVs, and the rebrand games insurers play — it's worth taking stock of what the first six chapters have established. Each individual problem with 17c may sound technical in isolation. Stacked together, they describe a method that systematically undercounts loss in nearly every scenario it's used in:
On a routine moderate-damage claim — say a $7,000 collision repair on a 4-year-old sedan with 45,000 miles — a market-based appraisal will frequently land on a diminished-value figure 3 to 5 times higher than the 17c output. The bigger the vehicle's underlying value, the more technology it has, and the more reportable the incident, the wider that gap becomes.
The 17c formula was built around a vehicle world that no longer exists. In 2002, "damage" almost always meant sheet metal, glass, and frames. In 2026, on most vehicles less than ten years old, damage means all of those things plus a constellation of cameras, radars, LIDAR units, ultrasonic sensors, calibration targets, software updates, and (on EVs) high-voltage components.
Advanced Driver Assistance Systems — adaptive cruise, automatic emergency braking, blind-spot monitoring, lane-keeping, parking sensors — are now standard or near-standard on the majority of new vehicles sold in the US. The Insurance Institute for Highway Safety has estimated that over 60% of registered vehicles will be ADAS-equipped by mid-decade.
ADAS systems affect diminished value in two compounding ways:
17c's damage modifier has no awareness of any of this. It reads "bumper, no frame damage" and assigns a low (or zero) modifier — even when $4,500 of the repair was electronics and calibration, and even when the Carfax now shows a damage flag on a safety-critical system.
It's worth noting that the auto industry is also moving faster on ADAS. Reported lawsuits tied to missed or improper ADAS calibrations rose from a handful in 2018 to over 60 in 2024, with average settlements between $200,000 and $1 million. That trend will only sharpen the buyer-side stigma on any vehicle with a calibration history. 17c, written long before any of this, does not budge.
Electric vehicles introduce a set of valuation considerations that have no analog in the 17c worksheet. Three are particularly important:
An EV's battery pack typically represents 30–40% of the vehicle's underlying value. Any damage near the pack — even when the pack itself is undamaged — triggers extensive inspection protocols at most OEMs. Buyers know this. The market discount on a repaired EV with documented battery-area work is consistently steeper than the equivalent ICE-vehicle stigma. The 17c damage tiers are silent on battery involvement.
Modern EVs (and increasingly modern ICE vehicles) ship with software that logs every error code, every reset, every calibration event. These logs are durable and read by inspection tools at trade-in. A repair history shows up not just on Carfax but inside the car's own brain. That has value implications 17c was not designed to model.
Replacement of onboard chargers, DC-DC converters, BMS modules, or any high-voltage harness produces a unique stigma in the used-EV market. Specialist buyers ask specifically whether a vehicle has had high-voltage work done. The 17c "structure / panels" framework has no field for it.
For a 2024-or-newer EV, an insurer's 17c output can be off from a real market analysis by an order of magnitude — sometimes more. Recent claim experience on Tesla Model Y, Lucid Air, and Rivian R1S vehicles in Georgia has shown carrier 17c offers in the $1,500–$3,000 range against documented market losses of $7,000–$12,000.
Every year the US fleet adds more ADAS-equipped vehicles, more EVs, more software-defined cars. Every year 17c's damage modifier grows further out of date. The formula was already inadequate at writing; in 2026 it's working against a market that doesn't share its assumptions. The gap between 17c output and actual market loss isn't shrinking — it's widening, and undercompensation remains systematic.
Because of the negative publicity 17c has earned over the years, several insurers no longer call it that. They call it something else, dress it up in different fonts and corporate letterhead, and continue to use the same three-multiplier structure underneath. If any methodology you receive uses a flat percentage cap (typically 10%), a graduated mileage modifier, and a 5-or-fewer-tier damage scale, it is a 17c clone — and it has the same flaws.
Names you may encounter on insurance correspondence and claim packets:
| Name on the worksheet | Carrier(s) most associated | Substantive difference from 17c |
|---|---|---|
| Evaluation Guideline Worksheet | USAA | Same components, different layout |
| Worksheet for Loss of Value | Multiple carriers | Same components |
| Diminished Value Worksheet | Multiple carriers | Same components |
| Loss of Value Worksheet | Multiple carriers | Same components |
| Georgia Worksheet | Used colloquially | None |
| Georgia 17C / DV-17C | State Farm and others | None |
You don't need to memorize names. Look for any of these three fingerprints:
If the worksheet shows two or more of those, it is mathematically equivalent to 17c, even if the brand name on the document is different. The same critique in this ebook applies — and so does the same response: a third-party measured-value appraisal will almost always produce a higher, better-documented number.
Beyond the rebrand games, there are a handful of tactics adjusters use to encourage claimants to accept a 17c number without challenge. Recognizing them is half the work of pushing back effectively.
It isn't. The Georgia Department of Insurance has explicitly said it does not endorse 17c. The Mabry trial-court order applied to State Farm, on Mabry-class policies. No statewide regulatory adoption ever happened.
The Mabry court approved 17c as a method for that class of plaintiffs, specifically so a 25,000-claim settlement could be administered. It did not endorse 17c as the correct method for any individual claim filed in 2026 by someone who was never part of the class.
This argument relies on the size of the gap between the 17c offer and the real loss feeling small enough not to be worth the friction. Often it isn't. A documented appraisal frequently changes the conversation without litigation, because the carrier knows how OCGA § 33-4-6 and § 33-4-7 work — and would rather settle at fair value than risk a bad-faith finding.
Every policyholder is entitled to their own independent appraisal. The carrier's appraiser works for the carrier. There is nothing improper about getting your own — in fact, the Mabry order explicitly preserved the right of any individual claimant to dispute the formula's output on their specific claim.
Be cautious about signing anything labeled "release" or "final settlement" while you still have an unresolved diminished-value question. A good rule of thumb: physical-damage payment (to the body shop) and diminished-value payment (to you) are two separate evaluations. Don't release the latter while focused on the former.
If you're working a claim where 17c is being applied, save everything: the worksheet, the J.D. Power printout, every email, every voicemail. If a third-party appraisal becomes necessary, that documentation is what your appraiser uses to make the case. The more complete the paper trail, the stronger the rebuttal.
Let's run the same vehicle through both 17c and a measured-value appraisal so the gap is concrete. We'll use the example from the original ebook — a 2010 Mazda MX-5 Miata Convertible — but examine it as if a similar claim came across an appraiser's desk today.
So under 17c, the carrier is presenting an offer of approximately $600 of diminished value on a vehicle that just sustained a $10,500 collision with airbag deployment.
Pause and ask: would you buy this exact vehicle for $600 less than an undamaged equivalent — knowing about the airbag deployment and the four replaced body components? Almost no buyer would.
A market-based appraisal looks at this same claim very differently. The appraiser pulls comparable sales of the same year/trim Miata in the relevant region — both clean-history examples and accident-history examples — and computes the actual dollar gap. The analysis would also consider:
For this vehicle, a real measured appraisal would typically conclude diminished value in the range of $3,000–$4,000. That's a 5x to 6x gap from the 17c output of $601.
| Approach | Result | Documentation |
|---|---|---|
| 17c formula (insurer worksheet) | $601 | Three multipliers; no comp data |
| Market-based appraisal | $3,000–$4,000 | Comparable sales analysis; vehicle inspection; USPAP-compliant report |
| Difference | ~$2,400–$3,400 | The amount you would leave on the table |
This was a 2010 Miata. Run the same exercise on a 2023 Mercedes GLE 450 with a $24,000 collision repair, ADAS recalibration, and an airbag deployment, and the 17c output will be a few thousand dollars while the actual market loss runs into five figures. The structural problem is the same — the dollars just get bigger.
17c is not just imprecise. It is structurally biased low, in a predictable way, on virtually every claim where it is applied. The math hasn't changed since 2002. The vehicles have. The market has. Your settlement should reflect that.
If you're holding a 17c offer that doesn't feel right, you have more leverage than the worksheet implies. Georgia law is on the side of policyholders here — but the carrier won't volunteer that. Here is the workflow that consistently produces better outcomes.
A good third-party appraiser is licensed, USPAP-compliant, inspects the vehicle in person, uses real comparable sales — and never charges contingency fees.
The 17c formula is a 2002 courtroom administrative shortcut that was never validated as an appraisal method, was never endorsed by the Georgia Department of Insurance, and has only grown more inaccurate as the vehicle market has evolved past it. Every component biases the output low.
Diminished value is real. Georgia law recognizes it. Your policy covers it. If the offer in front of you is a 17c output, you almost certainly have room to do better — get the math in writing, get a real appraisal, and negotiate from a position of evidence.
If you've been offered a 17c-based settlement, request a free no-obligation diminished value estimate. Five minutes of information is enough to tell you whether your claim is worth pursuing further.
Request a Free Estimate →Disclaimer: Educational resource on diminished value methodology. Not legal or financial advice. In Georgia, vehicles must generally be 10 model years old or newer to qualify. © 2026 Tony Rached / Appraisal Engine Inc.