1. The two components of car insurance
Comprehensive car insurance has two parts:
- Own damage (OD) premium: Covers damage to your own car from accidents, theft, fire, natural calamities. Calculated as a percentage of the IDV, adjusted for vehicle age, NCB, and add-ons.
- Third-party (TP) premium: Covers injury, death, or property damage caused to third parties. This is mandatory by law in India, and the premium is fixed by IRDAI based on engine capacity.
A comprehensive policy bundles both. A third-party-only policy covers only the TP component.
Comprehensive premium = OD premium + TP premium + Add-ons + GST (18%)
2. Own damage premium calculation
Own damage premium is roughly:
OD premium = IDV × Rate × Age factor × (1 − NCB) + Add-ons
Where:
- Rate: Typically 2.5%–3.5% of IDV per year, varying by insurer and vehicle type.
- Age factor: Older vehicles have lower rates (they're worth less), but some insurers also add depreciation.
- NCB: A 20%–50% discount based on claim-free years.
For a ₹8L hatchback with no NCB, the OD premium is roughly ₹8L × 3% = ₹24,000. With a 20% NCB, it drops to ₹19,200.
3. Third-party premium (fixed by IRDAI)
Third-party premiums are set by IRDAI and revised annually. For private cars, they typically look like:
| Engine capacity | Annual TP premium |
|---|---|
| Under 1000 cc | ₹2,000 – ₹2,100 |
| 1000 – 1500 cc | ₹3,400 – ₹3,500 |
| Above 1500 cc | ₹7,800 – ₹8,000 |
For two-wheelers, the TP premium is much lower (₹1,000–₹2,500 depending on capacity).
These premiums are the same across all insurers — they're not a competitive factor.
4. Depreciation and IDV
Your car's IDV is calculated as the ex-showroom price minus depreciation. The IRDAI prescribes depreciation rates:
| Vehicle age | Depreciation % | IDV (% of showroom) |
|---|---|---|
| 0–6 months | 5% | 95% |
| 6 months – 1 year | 15% | 85% |
| 1 – 2 years | 20% | 80% |
| 2 – 3 years | 30% | 70% |
| 3 – 4 years | 40% | 60% |
| 4 – 5 years | 50% | 50% |
| Above 5 years | Negotiated | Varies |
You can usually negotiate a slightly higher or lower IDV. A higher IDV means more coverage but higher premium; a lower IDV means less premium but smaller payout.
5. Add-ons and their costs
Add-ons increase your premium but provide useful extra protection:
| Add-on | Typical cost | Value |
|---|---|---|
| Zero depreciation | +15%–25% of OD | Very high — no depreciation on parts |
| Engine protection | +5%–10% of OD | High for older cars |
| Roadside assistance | ₹500–₹1,500 flat | Moderate — useful for breakdowns |
| Consumables cover | +3%–5% of OD | Moderate — covers oils, filters |
| Return to invoice | +8%–12% of OD | High for new cars — pays full invoice value |
The most valuable add-on is usually zero depreciation — without it, you pay depreciation on every replaced part, which can be 30%–50% of the claim for a plastic or metal part.
✓ Zero depreciation add-on is worth it for most cars — it can recover 30%–50% of the cost of every claim.
6. A worked example
Take a 3-year-old hatchback with an IDV of ₹8L, engine capacity under 1000cc, with a 20% NCB:
| Component | Amount |
|---|---|
| IDV | ₹8,00,000 |
| Base OD rate (3.0%) | ₹24,000 |
| Less: 20% NCB | −₹4,800 |
| Adjusted OD premium | ₹19,200 |
| Third-party premium | ₹2,094 |
| Zero depreciation add-on | ₹4,800 |
| Roadside assistance | ₹1,000 |
| Subtotal | ₹27,094 |
| GST (18%) | ₹4,877 |
| Total premium | ₹31,971 |
That's roughly 4% of IDV — a reasonable rate for a 3-year-old hatchback with zero depreciation and roadside assistance.
7. How to reduce your premium
Legitimate ways to pay less:
- Don't claim small damages. A ₹3,000 claim loses your NCB, costing more than the repair. Pay out of pocket for small dents and scratches.
- Choose a higher deductible. A voluntary deductible of ₹5,000–₹10,000 reduces the premium by 10%–20%. You pay that amount before the insurer pays.
- Compare insurers. Premiums vary 20%–40% for the same IDV and coverage.
- Choose a realistic IDV. A slightly lower IDV reduces premium — but increases the gap you'd pay on a total loss.
- Skip unnecessary add-ons. Consumables and return-to-invoice are valuable for new cars, less so for older ones.
- Buy online. Insurers offer 10%–15% discounts for online purchases.
- Bundle with home insurance. Some insurers offer multi-policy discounts of 5%–10%.
8. Common mistakes
- Under-insuring the IDV. A low IDV saves premium but leaves a big gap on total loss.
- Claiming small damages. Losing NCB is more expensive than paying for small repairs.
- Skipping zero depreciation. It's the single most valuable add-on for most cars.
- Not comparing. Premiums vary significantly. Ten minutes of comparison can save ₹5,000+.
- Choosing TP-only when comprehensive is affordable. TP-only is fine for very old cars, but comprehensive is essential for anything under 10 years.
- Forgetting to transfer NCB. NCB transfers when you switch insurers — never lose it.
9. When to switch insurers
Consider switching if:
- Another insurer offers the same IDV and coverage for 20%+ less.
- Your existing insurer delays or rejects claims unreasonably.
- You're offered a better NCB or no-claim benefit elsewhere.
- You want better add-ons or cashless service.
Always check claim settlement ratio before switching — cheaper isn't better if claims are difficult.
10. Final thoughts
Car insurance premiums are driven by the IDV, vehicle age, engine capacity, coverage type, NCB, and add-ons. Understanding each component lets you make better choices — buying the right coverage without overpaying for cover you won't use.
Use this calculator to get a realistic estimate for your car. Then compare quotes from 3–4 insurers with the same IDV and coverage. Small differences in premium add up to meaningful savings each year.
