What IDV means and why it's the starting point
Insured Declared Value (IDV) is the maximum amount an insurer will pay if the vehicle is stolen or damaged beyond repair — essentially the vehicle's current insured worth. Since the premium is calculated as a percentage of this value, a higher IDV means a higher base premium before any discounts are applied.
The formula
Base premium = IDV × base rate. No-Claim Bonus (NCB) discount amount = base premium × NCB discount percentage. Estimated annual premium = base premium − NCB discount + cost of any add-on covers. The NCB discount is a percentage reduction on the base premium specifically, not on the final total, and add-ons are priced separately on top.
A worked example
A vehicle with an IDV of ₹6,00,000, a 3% base rate, a 20% No-Claim Bonus, and ₹1,500 of add-on covers works out to: base premium ₹18,000 (₹6,00,000 × 3%), NCB discount ₹3,600 (₹18,000 × 20%), and an estimated annual premium of ₹15,900 (₹18,000 − ₹3,600 + ₹1,500).
Why the No-Claim Bonus matters as much as the base rate
No-Claim Bonus is a discount that grows with consecutive claim-free years, commonly reaching 20-50% at higher tiers — on the same ₹18,000 base premium, a 50% NCB would cut ₹9,000 off compared to just ₹3,600 at 20% NCB. Since NCB is tied to the policyholder's claim history rather than the vehicle itself, it's one of the few premium factors a driver has direct, sustained control over.
What this estimate leaves out
This is a simplified own-damage premium estimate — real premiums also include a separate third-party liability component set by the insurance regulator based on engine capacity, along with each insurer's own underwriting adjustments for factors like the vehicle's location, the owner's age, and claims history beyond just the NCB tier. Treat this as a starting estimate, not a binding quote.