No Claim Bonus in Health Insurance: How It Grows Your ₹5L Cover

Here's a scenario most Indian families never think about until renewal time: you buy a ₹5 lakh health policy, stay healthy for four years, and never file a single claim. You'd assume the insurer quietly pockets your premium and moves on. But if you read the fine print, something quietly powerful has been happening in the background — your ₹5 lakh cover may have silently grown to ₹7.5 lakh or even ₹10 lakh, without you paying a single rupee extra for that extra protection.

That silent upgrade is called the cumulative bonus, and most people either don't know it exists or accidentally destroy it during renewal. In an era of galloping medical inflation — hospital bills routinely rising 12–14% a year — this feature can be the difference between a fully-paid claim and a nasty out-of-pocket shock. The trouble is, insurers rarely advertise how the no claim bonus health insurance mechanism actually works, and agents chasing commissions often steer you toward the wrong renewal decision.

In this article, I'll break down exactly how the no-claim bonus grows your sum insured, show you a fully worked example with real ₹ numbers over five claim-free years, help you compare policies before you renew, and flag the common mistakes that quietly wipe out years of accumulated bonus. Let's get into it.

Key Takeaways

• No Claim Bonus (NCB) increases your sum insured for every claim-free year — typically 10–50% cumulative bonus, sometimes up to 100–200% on newer plans.
• A ₹5L cover with a 50% max cumulative bonus can become ₹7.5L over five claim-free years at no extra premium.
• Filing a small claim (say ₹15,000) can wipe out or reduce a bonus worth ₹1–2 lakh of extra cover — do the math before claiming.
• Some plans offer a "bonus protect" or "no-claim bonus super" rider so a single claim doesn't reset your accumulated bonus.
• Always compare the bonus percentage, the cap, and whether it resets on claim — not just the headline premium — before renewing.
• Medical inflation means your effective cover shrinks in real terms; NCB helps you keep pace without buying a bigger base plan every year.

What is a no claim bonus in health insurance?

A No Claim Bonus (NCB), also called a Cumulative Bonus (CB), is a reward your insurer gives you for not making any claim during a policy year. Instead of a cash discount, most health insurers add it as an increase to your sum insured — the maximum amount your policy will pay.

So if you own a ₹5 lakh cover and complete a claim-free year, your insurer might bump your cover to ₹5.5 lakh at renewal — a 10% cumulative bonus — while your base premium stays calculated on the original ₹5 lakh. You're effectively getting extra protection for free.

There are two broad styles you'll encounter:

• Sum insured boost (most common today): Your cover increases by a fixed percentage each claim-free year, up to a maximum cap. This is the version worth chasing.
• Premium discount (older/some plans): Instead of more cover, you get a small discount on the renewal premium. Less valuable in an inflation-driven world.

The exact terms — bonus rate, maximum cap, and what happens when you claim — vary wildly between insurers. That's why comparing on these three parameters matters far more than comparing the sticker premium.

How does the cumulative bonus actually grow your ₹5L cover?

Let's make this concrete. Most standard indemnity health plans in India offer a cumulative bonus of 10% per claim-free year, capped at 50% of your base sum insured. Some enhanced plans offer 50% per year capped at 100%, and a few "super bonus" variants go up to 200%.

Take a family floater base cover of ₹5,00,000 with a standard 10%-per-year bonus capped at 50%. Here's how it compounds over claim-free years:

Worked example: Sharma family, ₹5L floater, 5 claim-free years

The Sharmas — Rahul (38), his wife Priya (35), and one child — buy a ₹5 lakh family floater. Their annual premium is roughly ₹22,000 (including 18% GST). They stay claim-free. Watch what happens to their cover:

Policy Year	Bonus Added That Year	Cumulative Bonus	Effective Sum Insured	Premium (base ₹5L)
Year 1 (start)	—	0%	₹5,00,000	₹22,000
Year 2	+₹50,000	10%	₹5,50,000	₹22,000
Year 3	+₹50,000	20%	₹6,00,000	₹22,000
Year 4	+₹50,000	30%	₹6,50,000	₹22,000
Year 5	+₹50,000	40%	₹7,00,000	₹22,000
Year 6	+₹50,000	50% (cap)	₹7,50,000	₹22,000

By the sixth year, the Sharmas hold a ₹7,50,000 cover while paying premium calculated on ₹5,00,000. That's ₹2,50,000 of extra protection earned entirely by staying claim-free. If they'd wanted to buy a ₹7.5L base plan instead, their premium would likely have been ₹30,000–₹34,000 a year. So NCB effectively saved them ₹8,000–₹12,000 annually in avoided premium hikes.

On an enhanced plan offering 50% bonus per year capped at 100%, that same ₹5L would hit ₹10 lakh in just two claim-free years — a genuinely aggressive growth curve that some newer plans now advertise.

Pro tip: The cumulative bonus is calculated on the base sum insured, not on last year's inflated figure. So a "10% bonus" means ₹50,000 added each year on a ₹5L base — not 10% of ₹5.5L, then 10% of ₹6.05L. Don't confuse it with compound-interest style growth. To see how true compounding differs, plug figures into our Compound Interest Calculator.

Why does the no claim bonus matter more in an era of medical inflation?

India's medical inflation runs well ahead of general CPI inflation. While retail inflation hovers around 4–6%, healthcare costs — room rents, ICU charges, implants, diagnostics — routinely climb 12–14% a year. A ₹5 lakh cover that felt generous in 2020 buys far less hospital care today.

This is where NCB earns its keep. Your accumulated bonus partially offsets inflation by expanding your cover without you having to constantly upgrade your base plan (which triggers fresh medical underwriting and higher premiums). Think of it as a built-in, free inflation buffer — provided you stay claim-free.

To visualise how inflation erodes the real value of a fixed sum, run the numbers through our Inflation Calculator. A ₹5 lakh cover at 12% medical inflation is worth barely ₹2.8 lakh in today's purchasing power a decade from now. For a deeper look, read our companion piece on why your ₹5L health cover won't be enough by 2026.

What happens to your bonus when you make a claim?

This is the part that trips people up. Depending on your policy, filing a claim can either:

1. Reset the bonus to zero — you lose the entire accumulated cushion (older, stricter plans).
2. Reduce the bonus by one step — e.g. drop from 50% back to 40% (more common now). This is the "step-down" model.
3. Not affect the bonus at all — if you've bought a "bonus protect" or "no-claim bonus super" rider.

Here's why this matters with real money. Suppose the Sharmas, sitting at a 50% bonus (₹2.5L extra cover), face a small ₹18,000 dental-adjacent hospitalisation. If they claim it and their policy resets the bonus to zero, they've traded ₹18,000 of reimbursement for the loss of ₹2.5 lakh of accumulated cover. That's a terrible trade.

Common mistake: Filing small, out-of-pocket-affordable claims and destroying a large accumulated bonus. Before claiming, ask: "Is the claim amount larger than the value of the bonus I'll lose?" If a ₹20,000 claim wipes out ₹2 lakh of free cover on a reset-type plan, pay it yourself and preserve the bonus.

If your plan uses the gentler step-down model, the calculation is different — losing one 10% step (₹50,000 of cover) to reclaim an ₹18,000 claim may well be worth it. Always know which model your policy follows before you decide.

How do you compare policies on no-claim bonus before renewal?

When your renewal notice lands, don't just glance at the premium. Compare the bonus structure across your shortlisted plans. Here's a side-by-side of four representative bonus designs on a ₹5L base cover:

Plan Type	Bonus / Year	Maximum Cap	On Claim	Cover after 5 claim-free years
Basic indemnity	10%	50%	Resets to 0%	₹7,50,000
Standard "enhanced"	20%	100%	Step-down 20%	₹10,00,000
Aggressive bonus	50%	100%	Step-down	₹10,00,000 (by yr 3)
Super bonus + protect rider	50%	200%	No impact (rider)	₹15,00,000

Notice how the "super bonus + protect" variant nearly triples your cover in five years and keeps it intact even if you claim. That extra rider costs a little more premium, but if you have dependents or a family history of illness, it's often worth it.

A 6-step renewal checklist

1. Read the current bonus balance on your renewal notice — it's usually stated as "Cumulative Bonus: ₹X".
2. Confirm the bonus rate and cap in your policy schedule (10%/50%? 50%/100%?).
3. Check the claim-impact clause — reset, step-down, or protected.
4. Compare like-for-like: effective sum insured (base + bonus), not just the base cover.
5. Never let the policy lapse. Renew within the grace period (usually 30 days) — a lapse can zero out your accumulated bonus and your waiting-period credits.
6. If porting to a new insurer, confirm in writing that IRDAI portability rules let you carry forward your accumulated bonus. You're entitled to it, but insurers sometimes need a nudge.

Want to size the right base cover before layering on bonus? Model your family's needs and future premiums using the tools on our free calculators page, and cross-check EMI-style budgeting with the Goal Planner Calculator if you're saving toward a medical buffer fund.

Should you rely on NCB alone, or build a separate medical buffer?

NCB is powerful, but it isn't a complete strategy. It only grows if you stay claim-free, and a single major hospitalisation can pause its growth for years. Treat it as one layer in a three-layer defence:

• Layer 1 — Adequate base cover: A ₹10L floater for a young metro family is a sensible starting point today. See our take on whether a ₹10L cover is worth it at 25.
• Layer 2 — NCB / cumulative bonus: Let it compound your cover for free over the years.
• Layer 3 — A dedicated emergency SIP: Build a liquid medical corpus so you can pay small bills yourself and protect your bonus.

Worked example: the small-claim SIP that protects your bonus

Suppose Rahul redirects just ₹3,000/month into a liquid or arbitrage SIP for 5 years at ~7% CAGR. Roughly:

• Total invested: ₹3,000 × 60 = ₹1,80,000
• Approximate maturity value: ₹2.15 lakh (≈₹35,000 growth)

That ₹2.15 lakh becomes his self-funding pool for small hospital bills — so he never files a ₹15,000–₹40,000 claim and never risks resetting a ₹2.5L cumulative bonus. Run your own numbers through the SIP Calculator to see the exact projection for your monthly amount and tenure.

Do you get tax benefits on health insurance premiums that carry NCB?

Yes — and this is often overlooked. Under Section 80D of the Income Tax Act, premiums for health insurance qualify for deduction (available under the old tax regime). For FY 2025-26:

• ₹25,000 deduction for self, spouse and dependent children.
• Additional ₹25,000 for parents below 60 (₹50,000 if parents are senior citizens).
• The accumulated NCB doesn't change your deduction — it's based on the premium paid, and since NCB gives you free cover without raising base premium, you enjoy more protection for the same 80D benefit.

Remember, under the new tax regime (default from FY 2023-24), most deductions including 80D are not available. If claiming health-insurance deductions materially affects your tax, compare regimes carefully using our Income Tax Calculator before deciding. And since premiums attract 18% GST, our GST Calculator helps you see the tax component embedded in your renewal notice.

Watch out: co-payment and other clauses can undercut your bonus gains

A bigger sum insured (thanks to NCB) is only useful if the policy actually pays out fully. Two clauses commonly quietly reduce your effective payout:

• Co-payment: You bear a fixed percentage (often 10–20%) of every claim. A ₹10L cover with a 20% co-pay effectively pays only ₹8L on a ₹10L claim. See exactly how this works in our breakdown of how a ₹10L cover pays only ₹7L and how a 20% co-payment clause cuts your ₹5L claim.
• Room-rent capping and sub-limits: These can proportionately reduce your entire claim even when your sum insured is huge.

So when comparing plans, weigh the NCB structure alongside co-pay, sub-limits and disease-wise caps. A generous bonus on a plan riddled with sub-limits is less valuable than a modest bonus on a clean, no-co-pay plan. If you're also considering add-on covers like dental, our guide on whether a standalone dental cover is worth it is a useful read.

Frequently Asked Questions

What is a no claim bonus in health insurance?

It's a reward for a claim-free year, usually added as an increase to your sum insured (10–50% per year up to a cap) rather than a cash discount. Your base premium stays the same, so you get extra cover for free.

Does the no-claim bonus reset if I make a claim?

It depends on your policy. Older plans reset it to zero, most modern plans step it down by one level (e.g. 50% to 40%), and plans with a "bonus protect" rider keep it intact even after a claim. Always check your policy's claim-impact clause.

Can I transfer my accumulated cumulative bonus when porting insurers?

Yes. Under IRDAI portability rules you can carry forward your accumulated no-claim bonus and waiting-period credits to a new insurer at renewal, provided you port within the specified window. Confirm the carried-forward bonus amount in writing before switching.

Is it worth claiming a small hospital bill or should I pay it myself?

If your policy resets the bonus on any claim, compare the claim amount against the bonus value at stake. Losing ₹2 lakh of accumulated cover to claim ₹18,000 is a poor trade — often better to self-fund small bills from an emergency corpus.

How much can my ₹5 lakh cover grow with NCB?

On a standard 10%-per-year, 50%-cap plan, ₹5 lakh grows to ₹7.5 lakh over five claim-free years. On aggressive plans (50%/year, 100–200% cap), it can reach ₹10–15 lakh in a few years — all without raising your base premium.

Do I get income-tax benefit on the premium even after NCB?

Yes. Under Section 80D (old tax regime) you can claim up to ₹25,000 (₹50,000 for senior-citizen parents) on the premium paid. Since NCB gives you extra cover without raising the base premium, you enjoy more protection for the same deduction.

Does NCB apply to family floater policies?

Yes, on a floater the accumulated bonus applies to the whole family's shared sum insured — provided no member files a claim during the year. One claim by any member can affect the shared bonus depending on the policy terms.

The bottom line

The no claim bonus health insurance feature is one of the most underrated wealth-and-protection tools in an Indian family's financial toolkit. Stay claim-free and your ₹5 lakh cover can quietly grow to ₹7.5 lakh — or even ₹15 lakh on the right plan — without you paying a rupee more for that extra shield. In a country where medical bills climb 12–14% a year, that free inflation buffer is genuinely valuable.

But the benefit only works if you understand the fine print: know your bonus rate and cap, know whether a claim resets or steps down your bonus, protect large accumulated bonuses by self-funding small bills, and never let your policy lapse. Layer NCB with an adequate base cover and a small liquid emergency fund, and you'll have a health-protection strategy that most families miss entirely.

Ready to run the numbers for your own family? Start with our full suite of free financial calculators, project your medical-buffer SIP with the SIP Calculator, and check your tax position with the Income Tax Calculator. If you have a specific renewal question, feel free to reach out to us — and learn more about our approach on the About AlarmDaddy page.

Image credit: Health & Fitness — troutcolor, via flickr (BY-SA 2.0), sourced from Openverse.