Car Insurance IDV, NCB and Zero Depreciation Explained

Most car insurance renewals are accepted on trust. The quote looks roughly like last year's, so it is renewed in a few taps. The trouble appears later, at claim time, when the payout is smaller than expected — or at the next renewal, when a discount built up over years has quietly disappeared. Three terms explain almost all of that gap: IDV, NCB and zero depreciation. This guide explains them in plain language, with worked examples, so you can check your renewal quote before you pay. September 2026 data reported on 22 October 2026 put own-damage insurance at 41.3% of motor premiums, up from 39.6% a year earlier (CareEdge Ratings). QUICK ANSWER: IDV is the maximum your insurer pays if your car is stolen or written off. NCB is a discount of up to 50% on your own-damage premium after five claim-free years. Zero depreciation is an add-on that removes the depreciation cut on replaced parts in a repair claim. These three numbers decide your renewal cost and your claim payout.

What your renewal quote is really made of

A comprehensive policy is several parts added together. Third-party cover is mandatory under Section 146 of the Motor Vehicles Act, 1988, for a vehicle used in a public place. It pays other people — for injury or death caused by your car, and for damage to their property, capped at ₹7.5 lakh in the commonly cited summary. It pays nothing towards your own car, and its premium is tariff-set, so it varies little between insurers. Own-damage cover pays for damage to your own car from accidents, theft, fire and similar insured events, subject to the policy terms. IDV, NCB and zero depreciation all affect this part, and this is where comparing insurers changes the price. Add-ons sit on top, and GST at 18% applies to the premium.

IDV explained: the value your insurer puts on your car

IDV stands for Insured Declared Value: the sum insured for your car. If it is stolen or treated as a total loss, settlement is based on the IDV, less salvage where applicable — not on the price you paid, nor today's showroom price. IDV is fixed at the start of each policy period, from the manufacturer's listed price for the same brand and model, reduced by age-based depreciation. Standard schedule, first five years: up to 6 months, 5% (IDV 95% of list price); to 1 year, 15% (85%); to 2 years, 20% (80%); to 3 years, 30% (70%); to 4 years, 40% (60%); to 5 years, 50% (50%). Beyond 5 years, or for a discontinued model, IDV is agreed between insurer and policyholder. Worked example: a car with a listed price of ₹8,00,000, aged between two and three years, carries 30% depreciation, or ₹2,40,000, so its IDV is ₹5,60,000. That is the figure that matters if the car is stolen or written off that year. A lower IDV means a lower own-damage premium, because the maximum payout is smaller — but it also caps what you receive in the worst cases. Pushing IDV far below the car's real value to save a little premium is a poor exchange: the saving is certain and small, while the shortfall appears only when the loss is total.

The second depreciation table: what happens to parts in a repair

When your car is repaired, a standard policy does not pay the garage bill in full. Parts are depreciated by material, before any deductible; labour is generally paid in full. Standard rates: rubber, nylon and plastic parts, tyres and tubes, batteries and airbags, 50%, fixed regardless of age; fibreglass, 30%; glass parts such as the windscreen, nil; paint material, 50%; and other parts, including metal panels, by car age — nil up to 6 months, 5% to 1 year, 10% to 2 years, 15% to 3 years, 25% to 4 years, 35% to 5 years, 40% to 10 years, and 50% beyond 10 years. This is why a bumper matters so much. Bumpers are largely plastic, so they attract the flat 50% cut from day one, however new the car is. A ₹12,000 plastic bumper therefore attracts a ₹6,000 deduction before the deductible, while a glass windscreen attracts none. Out-of-pocket cost therefore depends heavily on which parts were damaged.

NCB explained: the discount you build by not claiming

NCB stands for No Claim Bonus: a discount on own-damage premium for a claim-free policy year. It does not apply to third-party premium. Standard grid, annual private car policy: 1 year, 20% off; 2 years, 25%; 3 years, 35%; 4 years, 45%; 5 or more years, 50%, the maximum. On a ₹20,000 own-damage premium, 50% saves ₹10,000 before GST and add-ons. Three rules matter. First, the bonus belongs to you, not the car: sell it and the buyer starts at zero, while you can carry your bonus to a new car or insurer with a certificate from your previous insurer. Second, a lapse beyond 90 days generally loses the bonus, which then takes five years to rebuild. Third, an own-damage claim generally wipes out or sharply reduces the bonus next renewal, unless you hold NCB protection.

Zero depreciation explained: what it removes, and what it does not

Zero depreciation, also called bumper-to-bumper cover, is an optional add-on that removes the part-wise deductions above from a repair claim, so parts are paid at full cost, subject to the policy terms. It does not remove everything: the compulsory deductible still applies (₹1,000 per claim up to 1,500 cc; ₹2,000 above), it does not apply to a total loss (settlement stays on the IDV basis; return-to-invoice is the separate add-on for the IDV-to-invoice gap), and consumables may still be excluded without a separate add-on. Many insurers also limit it by car age — commonly five years — or by claims per year. It is most valuable for plastic- and rubber-heavy bumper and body repairs on younger cars.

One repair bill, three decisions: claim, pay, or write off

Take a ₹25,000 bill on a three-and-a-half-year-old car above 1,500 cc: bumper ₹12,000, metal panel ₹8,000, labour ₹5,000. Standard policy: bumper ₹6,000 after 50% depreciation, panel ₹6,000 after 25% at 3 to 4 years, labour ₹5,000 — ₹17,000 allowed, less ₹2,000 deductible, so the insurer pays ₹15,000 and you pay ₹10,000. With zero depreciation: ₹25,000 less ₹2,000 deductible, so the insurer pays ₹23,000 and you pay ₹2,000. The ₹8,000 difference is an illustration, not a promised saving. Now add NCB: if the same owner holds 50% NCB on a ₹20,000 own-damage premium, losing it could cost up to ₹10,000 next renewal, before GST and add-ons. For a small repair paying only a few thousand rupees after depreciation and deductible, claiming may cost more in lost NCB than it saves; paying yourself keeps the bonus intact. For large damage, theft, fire or a serious accident, claim — that is what the policy is for. NCB protection, where held, changes this balance. Finally, the total-loss line: a car is a constructive total loss when retrieval plus repair costs exceed 75% of its IDV, and settlement is then on the IDV basis, less salvage. On an IDV of ₹4,00,000, the line is ₹3,00,000. A low IDV lowers the threshold at which a repairable car becomes a write-off — and above it, zero depreciation cannot help, as there is no repair.

Renewal checklist: five numbers to check before you pay

- IDV: close to the car's realistic market value for its age? A sharp unexplained drop deserves a question. - NCB: does the quote show your earned bonus (20%, 25%, 35%, 45% or 50%) on own-damage premium only? Zero after claim-free years should be queried before paying. - Zero depreciation: included, at what cost, and with what age or per-year claim limit? - Deductibles: your compulsory deductible (₹1,000 or ₹2,000 by engine size), plus any voluntary deductible raising what you pay per claim? - Dates: when does cover expire? A gap beyond 90 days risks the whole NCB — diary the date. Avoid the classic mistakes: chasing the cheapest premium with a very low IDV; assuming third-party-only cover repairs your own car (it does not); assuming zero depreciation means zero payment (the deductible still applies); and claiming for every scratch without weighing the NCB at stake. IDV sets the worst-case payout, NCB rewards claim-free years, and zero depreciation sets how much of a repair bill the insurer bears.

This article is for educational purposes only and is not financial advice. Please consult a SEBI-registered investment adviser for personalized guidance. Investments are subject to market risk. Sources: IRDAI standard motor policy wording / India Motor Tariff depreciation schedules; NCB grid and 90-day renewal rule; part-wise depreciation rates; compulsory deductibles ₹1,000/₹2,000; Section 146 Motor Vehicles Act 1988; CareEdge Ratings September 2026 motor data via CorpWhizz, 22 October 2026.