Every car owner wants to know why their insurance premium is the number it is, and whether they are paying a fair amount. The premium is not a random figure; it is built up from several well-defined components, some fixed by regulation and others priced by the insurer based on risk. Understanding how these pieces combine lets you predict your premium, spot ways to reduce it legitimately, and avoid being caught out by an unexpectedly high renewal quote.
At the heart of the own-damage premium sits the Insured Declared Value, or IDV, which represents the current market value of your car and effectively the maximum amount the insurer would pay if your vehicle is stolen or written off. The IDV is the single biggest driver of the own-damage portion, and it falls each year as your car depreciates, which is why premiums usually decline for older cars even as repair costs rise.
Alongside the IDV, the premium reflects your car’s engine capacity, its make and model, the city where it is registered, your No Claim Bonus, the deductibles you accept, and any add-ons you choose. The third-party portion, meanwhile, is fixed by IRDAI and depends mainly on engine size, so it does not vary between insurers. Separating these regulated and market-driven elements makes the whole calculation far less mysterious.
This guide explains each factor that goes into a car insurance premium in India, with a special focus on how IDV is set and why it matters so much. It also covers how No Claim Bonus, add-ons, and deductibles push the number up or down, and gives practical, honest ways to keep your premium reasonable without compromising the protection you actually need.
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The Two Halves of Your Premium
A comprehensive car insurance premium is essentially the sum of two parts: the own-damage premium and the third-party premium, plus applicable GST. The third-party portion is regulated by IRDAI and is largely uniform across insurers, based mainly on your car’s engine cubic capacity. It exists to fund your legal liability to others and cannot be discounted or negotiated.
The own-damage portion is where all the variation lives. It is calculated by each insurer using the IDV as a base and then applying a rate that reflects the car’s model, age, city, and risk profile. From that base, discounts such as the No Claim Bonus and voluntary deductible reduce the figure, while add-ons increase it. Understanding this split explains why two owners of the same car can pay very different total premiums.
- Third-party premium: regulated, based on engine capacity
- Own-damage premium: market-priced, based on IDV and risk
- No Claim Bonus reduces the own-damage portion
- Add-ons increase the own-damage portion
- GST is applied on top of the base premium
What IDV Really Means
IDV stands for Insured Declared Value, and it is the current market value of your car as agreed between you and the insurer at the start of the policy. It is not what you originally paid, nor the resale price you might negotiate privately; it is the manufacturer’s listed price adjusted downward for depreciation based on the car’s age. The IDV is the maximum the insurer will pay in the event of theft or a total loss.
Because the IDV forms the base on which the own-damage premium is calculated, a higher IDV means a higher premium and a larger potential payout, while a lower IDV means a cheaper premium but a smaller payout. Insurers usually allow you to choose an IDV within a permitted band around the standard value, so you have some control, but setting it unrealistically low to save premium can leave you underinsured.
It is helpful to think of the IDV as a promise of the maximum the insurer will pay if the car is completely lost. If you deliberately shrink that promise to trim a small amount of premium, you are quietly reducing the very protection you are paying for. A fair IDV that mirrors your car’s realistic market value is almost always the wiser choice, striking the right balance between cost and cover.
Factors That Influence Your Premium
This table shows the main factors in premium calculation and the direction in which each typically pushes the cost.
| Factor | Effect on Premium | Notes |
|---|---|---|
| Higher IDV | Increases | Larger payout, higher own-damage base |
| Higher engine capacity | Increases | Raises fixed third-party premium |
| Older car age | Decreases | Lower IDV reduces own-damage part |
| Higher No Claim Bonus | Decreases | Discount on own-damage premium |
| More add-ons | Increases | Each add-on adds an increment |
| Higher voluntary deductible | Decreases | You bear more per claim |
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How IDV Is Calculated Using Depreciation
The IDV starts from the car’s ex-showroom price and is reduced by a depreciation percentage that increases with the vehicle’s age. In the first few months the depreciation is small, but it grows each year so that by the time a car is several years old its IDV is a fraction of the original price. This is why a new car has a high IDV and a high own-damage premium, while an older car of the same model costs much less to insure.
For very old cars beyond a certain age, there is no fixed depreciation schedule and the IDV is instead agreed between the owner and insurer based on the car’s condition. Accessories and fittings not included in the factory price, such as a music system or alloy wheels added later, can be insured separately and are added to the IDV at their own depreciated value. Understanding this schedule helps you sanity-check the IDV your insurer offers.
- Depreciation is low in the first six months
- It rises each year as the car ages
- Older cars have lower IDV and lower own-damage premium
- Very old cars get a mutually agreed IDV
- Extra-fitted accessories are valued and added separately
The Role of Engine Capacity and Car Model
Engine cubic capacity directly drives the third-party premium, with higher-capacity engines attracting higher fixed third-party rates set by IRDAI. This is why a large SUV pays a higher third-party premium than a small hatchback even before own-damage is considered. Electric vehicles are rated on their motor power rather than displacement, under a separate IRDAI schedule.
The make, model, and variant of your car also influence the own-damage premium. Cars with expensive spare parts, higher repair costs, or a history of frequent or costly claims tend to carry higher own-damage rates. Insurers group models into risk bands, so a premium hatchback with pricey imported parts may cost more to insure on the own-damage side than a mass-market model with cheap, widely available spares.
This is worth keeping in mind even before you buy a car, because a model with a reputation for costly repairs will carry that burden into every year’s premium. Two cars at a similar price point can have noticeably different running insurance costs depending on parts availability and repair economics. Factoring the likely insurance cost into your purchase decision helps you avoid an unpleasant surprise at your first renewal.
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No Claim Bonus and How It Lowers Premium
The No Claim Bonus is one of the most powerful ways to reduce your own-damage premium. For every consecutive claim-free year, the discount steps up, typically starting around 20 percent after the first year and rising over several years to a substantial maximum. This discount applies only to the own-damage portion, but since that is where most of the variable cost sits, the saving is significant for careful drivers.
The NCB is forfeited if you make an own-damage claim during the year, resetting the discount at the next renewal. This is why many owners choose to pay small repair costs out of pocket rather than claim, so as to protect a large accumulated NCB. An NCB protection add-on lets you retain the bonus even after a limited number of claims, which can be worthwhile if your NCB is high.
- Starts around 20 percent after one claim-free year
- Steps up each subsequent claim-free year
- Applies only to the own-damage premium
- Resets to zero after an own-damage claim
- NCB protection add-on can preserve it after a claim
How Add-Ons and Deductibles Change the Number
Add-ons increase your premium but expand your protection. Zero-depreciation cover, which pays for parts without deducting depreciation, is one of the more popular and relatively costlier add-ons, especially valuable for newer cars. Engine protection, roadside assistance, return to invoice, and consumables cover each add their own small increment to the premium in exchange for filling specific gaps in the base policy.
Deductibles work in the opposite direction. Every own-damage policy has a compulsory deductible, a fixed amount you bear on each claim, set by regulation and not chosen by you. You can additionally opt for a voluntary deductible, agreeing to bear a larger share of each claim in exchange for a lower premium. A higher voluntary deductible reduces your premium but means you pay more from your pocket at claim time.
- Zero-depreciation add-on removes depreciation deductions
- Engine protection covers hydrostatic and lubricant damage
- Compulsory deductible is fixed by regulation
- Voluntary deductible lowers premium but raises your share
- Each add-on adds a small increment to the premium
Illustrative IDV Depreciation by Car Age
This table gives a general, illustrative sense of how IDV falls as a car ages; actual figures vary by insurer.
| Car Age | Approximate IDV Basis |
|---|---|
| Up to 6 months | Around 95 percent of showroom price |
| 6 months to 1 year | Around 85 percent |
| 1 to 2 years | Around 80 percent |
| 2 to 3 years | Around 70 percent |
| 3 to 4 years | Around 60 percent |
| Above 5 years | Mutually agreed on condition |
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City, Age of Car, and Other Rating Factors
Where your car is registered matters because insurers classify cities into zones based on traffic density, accident frequency, and theft rates. Cars registered in large metros with heavy traffic generally attract slightly higher own-damage rates than those in smaller towns. This geographic rating reflects the statistical likelihood of a claim in that location.
The age of the car influences premium through the IDV, as older cars have lower IDVs and therefore lower own-damage premiums, though their third-party premium stays fixed by engine size. Fuel type also plays a role, with CNG or LPG kits adding to the premium and requiring proper endorsement. Owner-related factors and the chosen add-ons round out the calculation that produces your final quote.
When you see your final premium, it is really the sum of all these layers: the regulated third-party charge, the IDV-based own-damage charge adjusted for city and model, minus your No Claim Bonus and any voluntary deductible discount, plus your chosen add-ons and GST. Breaking the number down this way makes it far less mysterious and shows you exactly which levers you can legitimately pull to reduce it.
Practical Ways to Reduce Your Premium
There are honest, safe ways to keep your premium in check without cutting essential cover. Preserving your No Claim Bonus by avoiding small claims is the most effective, since a high NCB can dramatically reduce the own-damage premium over time. Choosing a sensible voluntary deductible, installing an anti-theft device approved by the relevant automobile body, and comparing own-damage quotes across insurers can all help.
At the same time, avoid the false economy of setting your IDV artificially low or dropping cover you genuinely need. Underinsuring your car saves a little each year but leaves you badly short in a total loss or theft. The goal is to pay a fair premium for the right cover, using legitimate discounts and thoughtful add-on selection rather than simply chasing the lowest possible number.
- Protect your No Claim Bonus by avoiding minor claims
- Choose a voluntary deductible you can comfortably afford
- Install an approved anti-theft device
- Compare own-damage quotes across insurers
- Keep IDV realistic rather than artificially low
Frequently Asked Questions
What exactly is IDV in car insurance?
IDV stands for Insured Declared Value, which is the current market value of your car as agreed with the insurer. It is calculated from the showroom price reduced by depreciation based on the car’s age. In case of theft or a total loss, the IDV is the maximum amount the insurer will pay, and it also forms the base for calculating the own-damage premium.
Why does my premium go down as my car gets older?
As a car ages, its IDV falls because of depreciation, and since the own-damage premium is calculated on the IDV, that portion decreases. The third-party portion stays fixed by engine capacity regardless of age. So even though repair costs may rise, the falling IDV usually pulls the overall premium down for older cars.
Can I choose my own IDV?
Insurers generally allow you to select an IDV within a permitted band around the standard depreciated value. A higher IDV raises both your premium and your potential payout, while a lower IDV reduces both. It is best to keep the IDV close to your car’s realistic market value so you are neither overpaying nor underinsured in a total loss.
How much can a No Claim Bonus reduce my premium?
The No Claim Bonus applies to the own-damage portion and steps up with each claim-free year, often starting around 20 percent and rising to a substantial maximum after several years. Since the own-damage part is where most variable cost sits, a high NCB can meaningfully lower your total premium. The bonus resets to zero if you make an own-damage claim.
Is the third-party premium the same for all insurers?
Yes, the third-party premium is fixed by IRDAI and depends mainly on your car’s engine capacity, so it is broadly identical across insurers. There is no discount or negotiation possible on this component. Any difference in total premium between insurers comes from the own-damage portion and the add-ons, which each company prices independently.
Does a voluntary deductible really lower my premium?
Yes, opting for a voluntary deductible means you agree to bear a larger fixed share of each own-damage claim, and in return the insurer reduces your premium. The higher the voluntary deductible you accept, the larger the premium discount. The trade-off is that you pay more out of pocket at claim time, so choose an amount you can comfortably afford.
Do add-ons significantly increase the premium?
Each add-on adds an increment to your premium, and some like zero-depreciation cost more than smaller ones like consumables cover. Together, a full set of add-ons can noticeably raise the total, but they also expand your protection. The sensible approach is to select only the add-ons that match your car’s age, your city, and your driving pattern.
How does my city affect my car insurance premium?
Insurers classify cities into zones based on traffic density, accident frequency, and theft rates. Cars registered in large metros with heavy traffic generally attract slightly higher own-damage rates than those in smaller towns. This geographic rating reflects the statistical likelihood of a claim, so the same car can cost a little more to insure in one city than another.
Does adding a CNG kit change my premium?
Yes, fitting a CNG or LPG kit increases the premium because it adds value and a degree of risk to the vehicle. The kit must be properly declared and endorsed on the policy, and the RTO registration should reflect the conversion. Failing to declare a fuel kit can lead to claim complications, so always inform your insurer.
What is the single biggest factor in my premium?
For the own-damage portion, the IDV is usually the biggest single factor because the premium is calculated as a rate applied to it. For the third-party portion, engine capacity is decisive because IRDAI sets rates on that basis. Beyond these, your No Claim Bonus and chosen add-ons have the largest influence on the final figure you pay.
External Resource
IRDAI – Official Insurance Regulator
Official Resource
Understand your rights as a policyholder, verify registered insurers, and access official resources on the IRDAI website before you decide.
Disclaimer
This page is not affiliated with IRDAI, any insurer, or any government body. Motor insurance premiums, IDV, add-ons, and terms vary by insurer and vehicle. This content is for general information only and is not professional insurance or financial advice. Always confirm details with an IRDAI-registered insurer or a licensed advisor.
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