Premium Factors, Cover Types and 2026 Rules
Car insurance add-ons in India: is zero depreciation, engine protect or RTI worth it?
What the main motor add-ons pay, their usual conditions, and a worked break-even for zero depreciation, engine protection, return to invoice, consumables and NCB protection.
Add-ons are optional covers attached to the own-damage section of a comprehensive or standalone OD policy. The one most worth understanding is zero depreciation (also called nil depreciation or bumper-to-bumper): without it, the insurer deducts 50% on plastic, rubber and fibre parts and up to 50% on metal parts by age from every repair claim. On a car up to about five years old that you would claim on, zero depreciation usually pays for itself with one moderate claim. Engine protection matters in flood-prone cities, return to invoice matters for new cars, and consumables, NCB protection and roadside assistance are smaller conveniences. Buy add-ons for the losses you would actually claim, not by default.
This guide is part of how a car insurance premium is calculated. The comparison table summarises every add-on.
The main add-ons and their usual conditions
| Add-on | What it pays | Typical conditions to check |
|---|---|---|
| Zero depreciation | Full cost of replaced parts, without depreciation | Maximum vehicle age (often 5 years, some insurers longer); number of claims per policy year; excludes tyres in many wordings |
| Engine protection | Engine and gearbox damage from water ingress, oil leakage or hydrostatic lock | Damage from restarting a stalled engine in water may still be excluded; some require zero dep alongside |
| Return to invoice (RTI) | Difference between IDV and invoice price, often plus registration and road tax, on theft or total loss | Usually limited to the first three to five years |
| Consumables | Engine oil, coolant, brake fluid, nuts, bolts, washers, grease and similar items | Only when part of an admissible OD claim |
| NCB protection | Keeps your NCB slab after a limited number of claims | Usually only for NCB of 20% or more; one or two claims a year |
| Roadside assistance | Towing, battery jump-start, flat tyre help, fuel delivery, key lockout | Distance limits from home, number of call-outs |
| Key replacement | Cost of replacing lost or stolen keys and locks | Police report may be required |
| Tyre protect | Tyre damage from cuts, bulges and bursts | Only for listed causes; wear excluded |
| Daily allowance / loss of use | Fixed amount per day while the car is in the garage after an OD claim | Waiting days and maximum days |
Names and limits differ between insurers. Read the add-on wording, not only the name on the quote.
Worked example: does zero depreciation pay for itself?
Illustrative. A car 3 years 5 months old (metal parts depreciated 25%, IDV ₹5,00,000). Zero dep add-on: 0.5% of IDV = ₹2,500 + 18% GST = ₹2,950.
A minor collision needs:
| Item | Cost | Depreciation without zero dep | Deducted |
|---|---|---|---|
| Front bumper (plastic) | ₹9,000 | 50% | ₹4,500 |
| Headlamp unit (plastic lens and housing) | ₹7,000 | 50% | ₹3,500 |
| Bonnet (metal) | ₹12,000 | 25% | ₹3,000 |
| Paint material | ₹4,000 | 50% | ₹2,000 |
| Labour | ₹6,000 | None | ₹0 |
| Total | ₹38,000 | ₹13,000 |
Without zero dep you bear ₹13,000 of depreciation plus the compulsory deductible. With it, you bear only the deductible. The add-on cost (₹2,950) is recovered if you make even one claim of this size during the year.
The break-even question is: how likely are you to claim? If you claim once every four years, the expected depreciation saved is ₹13,000 ÷ 4 = ₹3,250 a year, still above ₹2,950. If you rarely claim and would pay small damage yourself to protect your NCB, the add-on is worth less. The claim payout estimator lets you test other bills, and the depreciation worked example shows the full claim settlement.
Engine protection: when it matters
Standard OD wording covers damage from flood or inundation, but engine damage caused by water entering the engine while it is running, or by trying to start it after it has been submerged, is commonly treated as consequential damage and excluded. In cities that flood during the monsoon, such as low-lying parts of Mumbai, Chennai, Bengaluru, Gurugram or Kolkata, an engine claim can run into lakhs for a modern car. Engine protection is often inexpensive compared with that.
Even with engine protection, follow the basic rule: if the car stalls in water, do not restart it. Call the insurer's helpline and have it towed.
Return to invoice: new cars only
Illustrative. A car bought for ₹9,20,000 on-road (ex-showroom ₹8,00,000) is stolen at 10 months. IDV at 15% depreciation: ₹6,80,000. Without RTI, the payout is ₹6,80,000 less the deductible. With RTI covering invoice value plus registration and road tax, the payout can approach ₹9,20,000. The gap is ₹2,40,000. Check whether your RTI wording includes registration and road tax, and the maximum car age.
Add-ons that are usually lower priority
- Consumables: useful with zero dep for owners who want almost nothing out of pocket, but the amounts involved are usually small.
- NCB protection: valuable at 45–50% NCB on an expensive car. Remember it keeps the percentage, not a fixed premium.
- Roadside assistance: compare with what your car manufacturer or an automobile association already provides.
- Daily allowance: worth it mainly if you need a taxi daily when the car is off the road.
How to compare add-ons across quotes
- Decide which add-ons you want before collecting quotes.
- Add them to every quote, so the totals are comparable.
- Check the limits: number of zero-dep claims, maximum age, waiting days.
- Price each add-on separately on each quote; some insurers charge much more for the same add-on.
- Check that add-ons do not change the deductible or exclude items you expected.
Related guides
Frequently asked questions
Can I buy zero depreciation on a seven-year-old car?
Some insurers offer it for older cars, often with stricter limits or an inspection; many stop at five years. Ask before renewal, because you usually cannot add it mid-term.
Does zero dep cover tyres and batteries?
Many wordings exclude tyres and tubes unless damaged in the same accident, and treat batteries separately. Read the add-on wording.
Will claiming under zero dep cost me my NCB?
Yes. Zero dep reduces depreciation deductions; it does not protect your NCB. That needs NCB protection.
Are add-ons available on a liability-only policy?
No. Add-ons attach to own-damage cover.
Sources
- IRDAI — approved products and add-on filings, consumer information
- Bima Bharosa — complaints if an add-on claim is refused
- Council for Insurance Ombudsmen — escalation for add-on disputes
