The varied rate of IDV's reflects different rates of premiums. Insured Declared Value, abbreviated as IDV, is the current value of the car after being adjusted for appropriate reduction. The rate of depreciation depends on the age of your car. Older the car, higher would be the depreciation and lowered would be your IDV. And it affects the Sum Assured. Hence, compare the IDV quoted offered by different car insurance plans is a must.
Type of car: If you have an expensive or powerful car then you are seen as a higher risk for a number of reasons. If it’s expensive, it has a higher risk of being stolen. If it’s powerful, it’s deemed more at risk of getting into an accident driving at speed. If you want to see how your car impacts your insurance, you can check which insurance group it’s in for an indication.