The De-Tariffing Correction in India 2026: STFI, IIB Burning Costs and the Return of Minimum Rates Through the Reinsurance Treaty

When the Insurance Regulatory and Development Authority of India removed the standard fire wordings and the residual pricing scaffolding from April 2024, the intent was to let insurers compete on price and product and to underwrite each risk on its merits. For commercial property buyers the early effect was welcome: fire and property premium rates fell sharply as insurers chased market share in a freshly competitive segment. Two years on, the picture is more sobering. The price falls outran the underlying risk, the property segment's profitability deteriorated, and the wider non-life industry has carried heavy underwriting losses. A freed market discovered, as freed markets often do, that competition without a floor can drive rates below technical cost.

The response has not been a return to the old tariff. Instead, discipline is re-entering the market through a quieter and more durable channel: the reinsurance treaty and the conditions attached to it. Because most Indian insurers cede a substantial part of their property risk and depend on treaty capacity to write large accounts, the terms on which that capacity is provided effectively set a floor under primary pricing. If the treaty requires that certain perils be rated at or above a minimum, or that loss-making risks be referred for rate confirmation, then the primary insurer cannot sustainably price below those conditions even in a soft market.

This matters because it reframes how a buyer should approach a property renewal in 2026. The question is no longer simply how low a rate the market will offer; it is whether the rate on offer sits above or below the floor that the treaty and the catastrophe-peril minimums impose, because a quote that ignores those conditions is either unsustainable or comes with terms the buyer should examine closely.

The clearest expression of the returning floor is in the catastrophe perils, principally storm, tempest, flood and inundation (STFI) and earthquake. These perils generate volatile, correlated losses that can hit many policies at once, and they are precisely the exposures a reinsurance treaty is most concerned to see adequately rated, because the reinsurer carries the tail. So the property segment in 2026 is seeing minimum rates and structural conditions reasserted specifically for these catastrophe perils, even as the base fire rate remains competitively priced.

For commercial buyers, several features of this are worth understanding:

• The catastrophe load is being separated from the base rate. Rather than a single blended fire rate, buyers should expect the STFI and earthquake components to be identified and rated with reference to minimums tied to the location's actual exposure. A plant in a recognised flood basin or a high seismic zone will carry a catastrophe load that the underwriter cannot simply compete away, because the treaty will not support it.
• Deductibles for catastrophe perils are firming. Alongside minimum rates, minimum deductible levels for STFI and earthquake are being applied more consistently. A higher catastrophe deductible is part of how the insurer and reinsurer keep the peril economic, and buyers should plan their balance-sheet retention around it rather than expecting nil-deductible catastrophe cover.
• Location data drives the load. Because the minimums are tied to exposure, the quality of the buyer's location and COPE data directly affects the rate. Accurate geocoding, elevation and flood-defence information can move a risk into a better band; vague data forces the conservative assumption and the higher load.

The strategic point for a buyer is that catastrophe pricing has become the least negotiable part of the property programme and the most data-sensitive. The base fire rate may still be keenly competed, but the STFI and earthquake components are anchored to minimums that reflect the reinsurer's view of the tail. A buyer who wants to manage catastrophe cost does so not by shopping for a carrier willing to ignore the floor, but by improving the data and the physical resilience that determine which side of the minimum the risk sits on, and by structuring retention sensibly so the premium spend buys protection where it matters most.

The other mechanism re-anchoring fire rates is the IIB burning cost, and it deserves a careful explanation because it has become the technical reference point against which a de-tariffed quote is now judged, and because its use in fire treaties has been genuinely controversial.

The Insurance Information Bureau, the data arm of the regulator, aggregates claims and exposure data across the whole non-life market and publishes burning-cost rates by occupancy, the classification of what a building is used for, from a textile mill to a pharmaceutical plant to a cold store. The method is, in essence, to take the actual incurred losses for an occupancy class over several prior years, load them for claims inflation and for the cost of running the risk, and express the result as a rate, usually in rate per mille terms (a rate per thousand of sum insured). The output is a class-average expected-loss rate: what, on the market's own experience, it has historically cost to carry a risk of that occupancy. Because it is built from the market's actual losses rather than from a regulator's judgement, the burning cost carries real authority as a measure of technical adequacy, and in the de-tariffed market it has filled much of the vacuum the old tariff left behind.

The controversy is precisely about how that authority is used. A burning cost is a class average, and a class average flattens the difference between a well-engineered, sprinkler-protected, well-housekept plant and a neglected one in the same occupancy. If a fire treaty or an underwriter rates strictly to the IIB burning cost as a floor, the well-run risk subsidises the poorly-run one and loses much of its incentive to invest in protection, since better engineering would not be rewarded with a lower rate. This is why the Authority has at points moved against the practice of writing IIB minimum rates into fire reinsurance treaties, to avoid hard-wiring a single market average as a binding floor and to keep room for genuine risk-based differentiation. The tension is live in 2026: the market wants a reference to restore discipline after the post-de-tariffing slide, but a crude minimum-rate floor undercuts the very risk-based pricing de-tariffing was meant to enable.

For the commercial buyer, the practical reading is specific:

1. Use the burning cost as a yardstick, not a verdict. Knowing the IIB rate for your occupancy tells you whether a quote is in the technically adequate zone or suspiciously below it, which is useful for spotting an unsustainable bid.
2. Argue your way below the average on evidence. A genuinely superior risk, with strong PML characteristics, fixed and automatic fire protection, good separation of values and a clean record, has a legitimate case to be rated below the occupancy average, and should make that case explicitly with the COPE and engineering data to support it.
3. Watch how the floor is applied. Whether your insurer treats the burning cost as a hard minimum or as a starting reference materially affects your rate, and a buyer is entitled to understand which, and to seek a carrier that prices the individual risk rather than the occupancy average.

The combined effect of catastrophe-peril minimums and IIB burning-cost references is that the 2026 property market is competitive on the base fire rate but firmly floored on the parts that matter most for an insurer's results. A buyer who understands this can renew intelligently rather than chasing a number that the market structure will not sustain.

The practical approach has four parts.

Read the quote against the floor. When a property quote arrives, separate the base fire rate from the STFI and earthquake loads and from the deductible structure, and judge each against the technical reference points: the IIB burning cost for your occupancy, the catastrophe minimums for your flood and seismic zone, and your own loss experience expressed as a rate. A quote that sits well below all of these is not necessarily a bargain; it may carry restrictive terms, a fragile carrier position, or an unsustainable rate that will correct sharply at the next renewal once the post-de-tariffing softness gives way.

Compete on data, not on shopping. Because the floors are exposure-sensitive, the most effective way to improve pricing is to improve the inputs: accurate occupancy classification, geocoded location and COPE data, current valuations to avoid under-insurance and the average clause, documented fixed and automatic fire protection, and a strong PML story. These move the risk into a better band against the very minimums that anchor the rate.

Structure retention to buy protection where it counts. With catastrophe deductibles firming, a buyer should decide deliberately how much working-layer and catastrophe loss to retain, and direct the premium spend toward the severe, balance-sheet-threatening STFI and earthquake exposures rather than toward smoothing small attritional losses that a sensible deductible would absorb more cheaply.

Challenge how the burning cost is applied. Establish whether your insurer is treating the IIB occupancy rate as a hard floor or as a starting reference, and where your engineering justifies it, press for pricing below the occupancy average on the strength of your protection and record rather than accepting a class-average rate for a better-than-class risk.

Doing this well depends on understanding how different insurers' wordings and rating approaches treat catastrophe perils, deductibles and the key exclusions, and where each carrier's appetite and pricing discipline sit as the floors firm. Sarvada gives commercial-insurance brokers and corporate risk teams structured, searchable access to insurer wordings and the intelligence around them, so a fire programme can be built and benchmarked against the catastrophe minimums and burning-cost references now shaping the de-tariffed market. Brokers and risk managers navigating the 2026 property renewal can Request Access to evaluate the platform for rate benchmarking and wording comparison.