
How the 17c Formula Works and Why It Underpays Your Diminished Value Claim
The 17c diminished value formula is the method most insurers use to calculate how much your car lost in value after an accident. The problem is that it was never designed to give you an accurate number. It caps your loss at 10% and applies multipliers that routinely ignore real market data. This guide breaks down exactly how the formula works and why a certified appraisal almost always gets you more.








