Your car insurance premium has two parts stitched together: a statutory third-party premium (set by IRDAI, based on engine CC, and identical across all insurers for the same CC band) plus an own-damage premium (calculated as a percentage of your IDV, with discounts for no-claim bonus, voluntary deductible, anti-theft devices, and the insurer's internal pricing). A typical comprehensive premium runs 3%-4% of IDV in year one and declines as IDV itself declines on each renewal.
| Consecutive claim-free years | NCB discount on OD premium |
|---|---|
| After 1 claim-free year | 20% |
| After 2 claim-free years | 25% |
| After 3 claim-free years | 35% |
| After 4 claim-free years | 45% |
| After 5+ claim-free years | 50% |
| After any claim | 0% (resets to base) |
The premium formula in plain English
For a comprehensive (full-cover) policy:
Premium = Third-Party Premium + Own-Damage Premium − NCB − Voluntary-Deductible Discount − Anti-Theft Discount + Add-on Premiums + GST (18%)
Each piece has different drivers — let's break them down.
Part 1 — Third-party (TP) premium
The third-party component is legally mandatory for every car on Indian roads, and IRDAI sets the rate annually. It depends only on engine capacity (cc) — not on car price, not on your driving history, not on city.
Approximate 2026 TP rates for private passenger cars:
- Up to 1000 cc: ~₹2,094/year
- 1000-1500 cc: ~₹3,416/year
- Above 1500 cc: ~₹7,897/year
These numbers are identical across all insurers. If a quote has a different TP figure, something is wrong with the quote.
Part 2 — Own-damage (OD) premium
This is the chunk that insurers compete on. It covers damage to your car — accident, fire, flood, theft. The base rate is roughly 2.5% to 3.5% of IDV for most private cars, adjusted upward for:
- Geographic zone (Zone A — Mumbai, Delhi, Bengaluru, Chennai, Hyderabad, Kolkata, Pune, Ahmedabad — costs more than Zone B)
- Car model's claim history (insurers track make + variant)
- Fuel type (diesel slightly higher, EV currently slightly higher due to expensive parts)
- Age of car (older cars can see OD rate creep up)
See our IDV explainer for how IDV itself is set.
Part 3 — Discounts that actually move the number
- No-Claim Bonus (NCB): Biggest lever. Starts at 20% after year 1, climbs to 50% after 5 claim-free years. Only discounts the OD portion, not the TP. Resets to zero the moment you make a claim (any size). NCB is transferable to a new car you buy — get the certificate from your old insurer.
- Voluntary deductible: Agree to pay the first ₹2,500-₹15,000 of any claim yourself → 5%-25% off OD premium. Only worth taking if you're confident you won't make small claims.
- Anti-theft device discount: 2.5% off OD, capped at ₹500. Device must be ARAI-approved and fitted at time of policy quote.
- Long-term policy discount: Multi-year policies can price in a modest discount vs annual renewals.
Part 4 — Add-ons that inflate the bill
Each of these is optional but commonly bundled:
- Zero depreciation ("bumper-to-bumper"): 20%-25% on top of OD premium. Pays full part replacement without deducting wear-and-tear. Worth it for cars under 5 years old.
- Engine protect: 3%-8% on top of OD. Covers hydrostatic / oil seize damage, which standard policies exclude. Worth it in flood-prone cities.
- Roadside assistance: ₹200-500 flat. Usually worth it.
- Return to invoice: 3%-5% on top of OD. In a total-loss scenario, pays the difference between IDV and original invoice — protecting you from the first-year depreciation hit. Worth it for cars under 2 years old.
- Consumables cover, key protect, tyre protect: Niche. Skip unless the specific scenario applies to you.
Worked example: ₹10L car, 1200cc, 2 years old, Mumbai
Indicative; real quotes vary.
- IDV (80% of ex-showroom at age 1-2): ₹8,00,000
- OD base premium @ 3% of IDV: ₹24,000
- NCB discount @ 25% (2 claim-free years): −₹6,000 → OD after NCB: ₹18,000
- Zero-dep add-on @ 22% of OD: +₹3,960
- Third-party premium (1200cc): ₹3,416
- Subtotal: ₹25,376
- GST @ 18%: ₹4,568
- Total annual premium: ₹29,944
That's 3.7% of IDV — right in the typical range. Drop the zero-dep add-on and you're at ₹25,271. Add engine-protect and return-to-invoice, you're at ~₹33,500.
How to actually reduce your premium
- Don't make claims under ~₹15,000 — the NCB loss next year usually costs more than the claim itself.
- Shop around every renewal. Own-damage premium on the same IDV can swing 15-30% between insurers.
- Set IDV honestly, not at the lowball end — see why.
- Take the voluntary deductible only if you're a low-claim driver with financial buffer to absorb small repair costs.
- Bundle zero-dep in year 1-3 when part replacements are most likely; consider dropping it from year 4-5 onward.
People also ask
Can I negotiate car insurance premium?
The TP portion is fixed by IRDAI — non-negotiable. The OD portion varies substantially between insurers, and agents have some discretion on discounts. Always get 3+ quotes before renewal — the spread on identical coverage is often 15-30%.
Is comprehensive insurance worth it?
For cars under 7-8 years old, almost always yes. Below that age, a total-loss event or a major own-damage claim easily exceeds a decade of premium. For very old or low-value cars, third-party-only plus a savings buffer can be more rational.
Why did my premium go up after a claim?
You lost your NCB — which can reset from a 50% discount to 0%, effectively doubling your OD premium. Some insurers also reclassify your risk tier after a claim, adding further load. Over 2-3 subsequent claim-free years, NCB rebuilds.
Is online car insurance cheaper?
Usually yes — direct-to-consumer online policies skip agent commission and can be 10-25% cheaper than the same insurer's offline quote. Coverage is identical; claim service is identical. The trade-off is that you do the paperwork yourself.
What does GST on car insurance include?
18% GST applies to the total premium (TP + OD + add-ons − discounts). It is not a separate fee — it is built into the final number your insurer quotes. Always compare gross-of-GST figures across insurers.