Calculate your No Claim Bonus percentage instantly and see how a claim affects your insurance discount. Free NCB calculator for car owners..
Every year you don't file a claim on your car insurance, you're quietly building a discount that can eventually cut your Own Damage premium in half - but most owners never actually check what percentage they're sitting on, or how much they'd lose by filing a small claim. An NCB Calculator tells you exactly where you stand and what a claim would cost you in future discount, before you decide whether that dent is worth reporting. This guide explains how No Claim Bonus actually works and shows you how to use the calculator to make an informed renewal or claim decision.
An NCB Calculator is an online tool that estimates your No Claim Bonus percentage based on the number of consecutive claim-free years on your car insurance policy. NCB is a discount on the Own Damage portion of your premium, awarded by your Insurance Company under a slab structure standardized by IRDAI across the industry, meaning the discount percentage for a given number of claim-free years is the same regardless of which insurer you're with.
The calculator is particularly useful right before a Policy Renewal, since it shows you both your current entitled discount and, if you're considering filing a claim, exactly how much that decision would cost you in forfeited bonus over the following years. This connects directly to your overall premium - if you haven't already, it's worth running your numbers through the full Car Insurance Premium Calculator to see your NCB discount applied against your actual Own Damage premium.
If you're weighing whether a claim is worth it against your vehicle's overall condition and value, it also helps to check the Vehicle Resale Value Calculator first - a car nearing the end of its ownership cycle may not justify preserving NCB the same way a newer vehicle would.
Your NCB percentage is determined by a small, well-defined set of rules, but a few nuances catch most policyholders off guard.
NCB doesn't grow linearly - it follows a fixed slab structure set by IRDAI, with the discount increasing each claim-free year up to a capped maximum:
| Consecutive Claim-Free Years | NCB Discount on Own Damage Premium |
|---|---|
| After 1st year | 20% |
| After 2nd year | 25% |
| After 3rd year | 35% |
| After 4th year | 45% |
| After 5th year and beyond | 50% (maximum cap) |
The discount is applied only to the Own Damage component of your premium, not the Third Party portion, which remains fixed regardless of your NCB standing:
Discounted OD Premium = Base Own Damage Premium × (1 ? NCB Discount %)
These percentages are standardized across the industry by IRDAI but are periodically reviewed, so always confirm the current slab against your insurer's latest policy document before making a claim decision based on these figures.
Example 1: Fourth Renewal, No Claims Filed
A policyholder has renewed their policy for 4 consecutive years without filing a single claim, and their base Own Damage premium is ?16,000. At the 45% NCB discount applicable after 4 claim-free years, their discounted OD premium comes down to approximately ?8,800 - a saving of ?7,200 purely from maintaining a clean claim record.
Example 2: Deciding Whether to File a Minor Claim
The same policyholder gets a minor bumper scratch repaired, costing ?6,000. Filing a claim would reset their NCB to 0% at the next renewal, meaning their next year's OD premium jumps back to the full ?16,000 instead of a discounted amount - an immediate loss of roughly ?7,200 in bonus, more than the repair cost itself. In this case, paying the ?6,000 repair out of pocket and preserving the NCB is the financially sound choice. If unsure whether the vehicle's remaining life justifies protecting a high NCB at all, checking the Road Tax Calculator renewal figures alongside its resale value can help frame the bigger ownership-cost picture.
No Claim Bonus is a discount on the Own Damage portion of your car insurance premium, awarded for each consecutive year you renew your policy without filing a claim, following a slab structure standardized by IRDAI.
The maximum NCB discount typically caps at 50% after five or more consecutive claim-free years, though this figure should be confirmed against the current IRDAI-mandated slab in your policy document.
Yes, filing even a single claim in a policy year resets your No Claim Bonus back to 0% for the following renewal, regardless of how many consecutive claim-free years you had accumulated before that claim.
Yes, NCB is attached to the policyholder rather than the vehicle or insurer, and can be transferred to a new car or a new insurer by providing a valid NCB retention/transfer certificate from your previous insurer.
Your accumulated NCB does not transfer to the vehicle's new owner. As the seller, you can carry your NCB forward to a new vehicle you purchase, provided you obtain the NCB retention certificate from your insurer before the policy is transferred or cancelled.
No Claim Bonus is one of the few insurance discounts entirely within your control - every claim-free year builds toward a meaningfully lower premium, and understanding the exact slab you're at helps you make smarter decisions about whether a minor claim is genuinely worth filing. Check your exact NCB percentage and potential savings with the NCB Calculator, and explore the complete Calculators Hub on RTOCheck for all your vehicle ownership cost planning needs.