Underwriting
The craft of deciding which risks to accept, reject, or reprice — the quality control on every rupee of premium.
Why you care
Underwriting is the decision at the front door: accept this risk, reject it, or load the price. It's where the quality of premium is set. GWP tells you how much came in; underwriting tells you whether it should have. Every claim two years from now traces back to an underwriting call made today.
Run the numbers
Two health insurers write ₹100 cr of premium each. One screens age, history and hospital networks; the other waves everyone in to hit a growth target (illustrative). Same top line today, very different loss ratios in two years — because the bad risks all sit in the second book.
Where this goes
Loose underwriting flows straight to a fat loss ratio, just on a delay. Underwriting also sets up rate adequacy: choosing the risk is half the job, charging enough for it is the other. And how much of a big risk to keep versus cede is an underwriting call — see reinsurance.
Why you care
Underwriting is the discipline of deciding which risks an insurer takes on, on what terms, and at what price. It is the risk-selection filter on every policy, and it is where the quality of an insurer's premium is actually decided.
Selling is about volume; underwriting is about quality. A branch or an agent can bring in a mountain of premium. But if the underwriting is loose — accepting the sick, the accident-prone, the flood-plain factory, all at standard rates — that premium is a liability dressed as revenue. The damage is invisible at first, because the claims come later. That delay is exactly what makes underwriting dangerous to neglect: a book written badly this year looks fine on this year's numbers and blows up on the loss ratio a year or two out. For anyone in the business, the mental picture is a filter at the front door that either protects the book or quietly poisons it.
Run the numbers
Two health insurers each write ₹100 crore of fresh premium in a year.
- Insurer A underwrites. It screens age bands and medical history, prices pre-existing conditions with waiting periods and loadings, and steers away from hospitals with a record of inflated bills.
- Insurer B chases growth. It clears applications with minimal scrutiny to hit a top-line target, at standard rates.
On this year's results they look identical: same ₹100 crore of premium, same GWP growth in the press release. But claims lag sales. Two years later, Insurer B's book is carrying a disproportionate share of the people most likely to claim, at prices that never accounted for them. Its loss ratio runs 10–15 points hotter (illustrative). Insurer A gave up some growth and kept its book clean. The premium was the same; the underwriting is what differed, and the underwriting is what the loss ratio eventually reveals.
Where this goes
Underwriting feeds directly into the loss ratio, just on a delay — which is why a loss ratio spike is often the echo of an underwriting decision made two years earlier. It pairs with rate adequacy: choosing the right risks and charging enough for them are two halves of the same discipline, and getting either wrong lands in the combined ratio. Finally, deciding how much of a large exposure to retain versus pass on is an underwriting judgement, handled through reinsurance.
What causes what
After this
- Underwriting causesLoss Ratio (Claims Ratio)Slack underwriting — accepting risks that shouldn't have been written — shows up months later as claims, and a higher loss ratio.
- Underwriting causesRate Adequacy / PricingUnderwriting decides which risks to accept; pricing decides whether they're taken on at a rate that pays.