Ans: Â The moment a new car leaves the showroom, depreciation is taken into account to estimate the IDV. Up to the first six months of buying a car, most motor insurers levy only 5% of depreciation on the invoice value of the car. Therefore, the IDV of a car outside the showroom will be the ex-showroom value of the car minus 5% depreciation i.e. 95% of the invoice price of the car.