When you buy a new car, the value is very clear, and that's the sum insured. However, as the car ages, deciding the right value for it becomes a problem. IDV is a process that helps determine the value of the car.
The industry body has a predetermined formula to calculate the IDV. It is the value of a car for the total sum insured. If the car gets stolen or is a total loss, that is the amount which shall be paid. So, don't try to lower the IDV from what is suggested to you. The differential in price will not be much.
Sometimes when you ask for a lower premium and if the agent is not very fair, he or she may reduce your IDV and your premium may get lower. So, always look at the value of the car derived by the formula and ask for that.
Let me give you the context of all these add-ons and why it is not part of the policy. In India, the pricing was freed in the year 2007. Before that, it was under tariff. So, the original motor policy is the same for all the companies for many years. In that, the depreciation of plastic (parts) is at 50 per cent. Those were the times when the car and the bumper were all metal. There was nothing called plastic, and glass made zero difference. But in today's time, most of the car is (made of) fiber, which is mostly plastic.
As for NCB, if you don't make a claim, you get a rebate in premium. If you make a claim, then there is a loading on the premium. That again comes from those earlier times of tariff, but still continues because the wording is the same. Insurance companies have add-ons to make the policy more relevant in today's time.
Let's say I have four or five years of no claims, my NCB can go up to 50 per cent. So, let's have a 50 per cent reduction in premium. If I have a small claim of let's say Rs 2,500 or Rs 5,000 and I claim that money, then my entire NCB, 50 per cent, which I was getting as a rebate on my premium, disappears. So, when you have a small claim, always check that if you have a no-claim period, are you actually getting more benefit in terms of the premium that you are saving. Would you want to make the small claim or would you be self-insured for that because the premium saving is high?
The way NCB operates is that it keeps on accumulating. But if you have one claim, the NCB starts moving down on that basis. So, if you have a strong policy that has a huge amount of NCB, please see that when you have a small claim, is it worth taking that or not?