The 17c formula: what your car lost in value, even after perfect repairs
A repaired wreck is worth less than a clean twin, and insurers can be made to pay that gap. The 17c formula, from Georgia's State Farm v. Mabry decision, prices it: 10% of pre-accident value, times a damage multiplier (0.00-1.00), times a mileage multiplier (1.0 down to 0.0). On a $25,000 car with major structural damage (0.75) and 35,000 miles (0.8), that's 25,000 × 10% × 0.75 × 0.8 = $1,500. Insurers like the formula because it undervalues claims; appraisers say real losses run 15-30% on late-model cars. Use it as your opening demand, not your ceiling.
| Damage level | Multiplier |
|---|---|
| Severe structural damage | 1.00 |
| Major damage to structure and panels | 0.75 |
| Moderate damage | 0.50 |
| Minor damage | 0.25 |
| No structural damage or replaced parts | 0.00 |
| Odometer | Multiplier |
|---|---|
| 0 – 19,999 mi | 1.0 |
| 20,000 – 39,999 mi | 0.8 |
| 40,000 – 59,999 mi | 0.6 |
| 60,000 – 79,999 mi | 0.4 |
| 80,000 – 99,999 mi | 0.2 |
| 100,000+ mi | 0.0 |
Charts as published in 17c guides by Kelley Blue Book, Collision Consulting, and claims consultants. The mileage chart is the formula's cruelest feature: past 100k, it computes zero regardless of damage.
| Vehicle | Damage | Miles | 17c Claim |
|---|---|---|---|
| $40,000 SUV | Moderate (0.50) | 55,000 (0.6) | $1,200 |
| $25,000 sedan | Major (0.75) | 35,000 (0.8) | $1,500 |
| $20,000 hatchback | Severe (1.00) | 15,000 (1.0) | $2,000 |
| $30,000 truck | Major (0.75) | 105,000 (0.0) | $0 |
Check any row by hand: value × 0.10 × damage × mileage. The last row is why high-mileage owners skip 17c and demand appraisals instead.
The 17c formula came out of a Georgia class action, State Farm Mutual Auto Insurance Co. v. Mabry (2001), and it's the number most insurers will engage with, even outside Georgia. Step one caps the base loss at 10% of your car's pre-accident fair market value. Step two scales for how bad the damage was. Step three scales again for mileage, the logic being that a high-mileage car already carries less value to lose.
A $25,000 sedan takes major structural damage and carries 35,000 miles. Base loss: 25,000 × 0.10 = $2,500. Damage multiplier 0.75: $1,875. Mileage multiplier 0.8: $1,500. That $1,500 is the 17c demand figure.
Second example: a $40,000 SUV with moderate damage at 55,000 miles. Base: 40,000 × 0.10 = $4,000. Damage 0.50 → $2,000. Mileage 0.6 → $1,200. Note the SUV with more real-world damage money on the table claims less than the cheaper sedan, purely because of the multiplier stack.
Timing and paper win these. Finish repairs first; a DV claim needs completed invoices and photos. Send the at-fault driver's carrier a written demand with repair records, before/after comparable listings, your 17c math, and a specific number. Expect the first answer to be no; the second letter, citing Mabry and market comparables, is where settlements usually appear. For amounts under your state's small-claims ceiling (typically $5,000-$10,000), filing yourself is cheap leverage. An independent DV appraisal costs roughly $200-500 and often pays for itself on late-model cars.
Independent appraisers argue inherent diminished value on a late-model car with structural damage commonly runs 15-30% of pre-loss value, and the calculator shows that aggressive band alongside the 17c number so you can anchor the negotiation. Related math: if injuries were involved, start with the car accident settlement calculator, and for the citation that may have caused it, the speeding ticket cost calculator. Broader injury valuation is at the pain and suffering calculator.
It's a claim for the resale value your car lost by having a wreck on its history, even after perfect repairs. A repaired car with a CarFax accident entry sells for less than a never-wrecked twin, and that gap is inherent diminished value. Most insurance policies let the at-fault driver's insurer be asked to pay it, and in Georgia (State Farm v. Mabry, 2001) insurers are expressly required to consider it.
Three steps. Take 10% of the car's pre-accident market value as the base loss. Multiply by a damage multiplier from 0.00 (no structural damage) to 1.00 (severe structural damage). Multiply again by a mileage multiplier from 1.0 (under 20,000 miles) down to 0.0 (over 100,000). A $25,000 car with major damage (0.75) at 35,000 miles (0.8) claims $25,000 × 10% × 0.75 × 0.8 = $1,500.
The formula itself is Georgia case law, but insurers across the country often respond to 17c-based demands because it gives them a defensible number, and many states allow diminished value recovery in some form. Some states are hostile: Michigan historically barred it for the at-fault party's own insurer, and a few restrict third-party DV claims. Treat 17c as a negotiation floor and check your state's current rules.
Wait until repairs are finished, then send the at-fault driver's insurer a written demand with: the repair records, photos, comparable listings showing the never-wrecked price, your 17c calculation, and a specific dollar demand. Keep it factual. Insurers' first response is usually a lowball or 'we don't pay DV'; a calm second letter citing Mabry and comparable sales moves many claims. Small-claims court is the next step for amounts under your state's limit, typically $5,000-$10,000.
Because the multipliers can crush the 10% base to near nothing, especially on older cars: over 100,000 miles, the formula computes zero no matter how bad the damage was. Appraisers argue real diminished value often runs 15-30% of pre-loss value on late-model vehicles with structural damage. Insurers love 17c for the same reason. Use it as the conversation opener, then push with before/after comparable sales or an independent appraisal.
It rides on the property-damage statute of limitations in your state, commonly 2 to 6 years from the accident, but practically you should demand it within weeks of completed repairs while the file is fresh. Some policies and states have shorter contractual windows, and evidence (comparable listings, repair invoices) ages badly. Confirm the deadline for your state before you wait.