How insurance works and makes money
The three lines, the value chain from pricing to claims, where profit comes from, distribution, and takaful.
Industry brief, with a one-minute summary: InsuranceKey takeaways
- An insurer is paid first and pays later. It collects premiums today, pays claims when bad things happen, and invests the money in between.
- A premium is the price a customer pays for cover.
- The biggest operational tasks are pricing, underwriting, and claims.
Key idea
An insurer is paid first and pays later. It collects premiums today, pays claims when bad things happen, and invests the money in between. It profits if premiums cover claims and expenses (underwriting profit) and from the income on the money it holds.
A premium is the price a customer pays for cover. A claim is a request for payment after a loss, such as a car accident or a death. The policy is the contract. Insurance works because of pooling: many customers each pay a small, predictable premium, and the few who suffer a loss are paid from the pool. The insurer's skill is pricing the risk correctly, before it knows who will claim.
| Line | What it covers | Customers | Special feature |
|---|---|---|---|
| Life | Death (term life), savings and retirement income (endowments, annuities, unit-linked plans) | Individuals, and employers for group cover | Contracts last many years, so investment returns and interest rates matter a lot |
| Property and casualty (P&C, also called non-life or general) | Cars (motor), homes, businesses, ships (marine), liability to others | Individuals and companies | Claims come within months or a few years; natural catastrophes cause large spikes |
| Health | Hospital and doctor costs | Individuals, employers, and governments | Medical inflation and hospital prices drive claims; often compulsory for employers, as in parts of the Gulf |
So-what
Ask which line the case is about. Life cases are about long-term savings, interest rates, and distribution; P&C and health cases are usually about claims and pricing.
- Insurance value chain
- Product design and pricingActuaries estimate how often claims happen and how big they are.
- DistributionAgents, brokers, banks (bancassurance), direct and online sales, comparison sites, and cover sold inside another purchase (embedded insurance).
- Key: UnderwritingDeciding whether to accept a customer and at what price.
- Policy administrationIssuing policies, collecting premiums, renewals.
- Key: Claims handlingChecking, paying, and fighting fraud. Claims are usually the largest cost.
- Investment of reservesThe money held for future claims (the float) is invested, mostly in bonds.
- ReinsuranceThe insurer buys insurance for itself from a reinsurer to limit large losses.
Each step is a place where an insurer can win or lose money.
| Line | Approximate amount per 100 of premium | Plain meaning |
|---|---|---|
| Premiums earned | Exactly 100, the base | The price of cover for the period |
| Claims and claim handling costs | About 60 to 75 | This share is the loss ratio |
| Commissions to agents and brokers | About 10 to 20 | Part of the expense ratio |
| Administration and other expenses | About 10 to 15 | Part of the expense ratio |
| Underwriting result | Often between minus 5 and plus 10 | 100 minus the combined ratio |
| Investment income | Often 3 to 10, higher when interest rates are high | Return on the money held for future claims |
So-what
These are rough ranges that vary by country, line, and year. Many insurers earn little or nothing on underwriting and make their profit from investment income, which is risky when rates fall.
Operations and reinsurance
The biggest operational tasks are pricing, underwriting, and claims. Claims teams check each claim, estimate the final cost, and fight fraud. Insurers must also set aside reserves, money kept for claims that have happened but are not yet paid. Reinsurance is insurance for insurers. In a quota share treaty the reinsurer takes an agreed share of every policy's premiums and claims. In an excess of loss treaty the reinsurer pays losses above a threshold, up to a limit. Large reinsurers include Munich Re, Swiss Re, and Hannover Re, and the Lloyd's of London market is a major hub for specialist risks.
Takaful: Islamic insurance
Takaful follows Sharia principles. Participants contribute to a common risk fund, partly as a donation (tabarru) to help any member who suffers a loss. A takaful operator manages the fund. Under the wakala model it takes an agreed fee; under the mudaraba model it takes a share of investment profit. If the fund has a surplus, part of it may be returned to participants. If it has a deficit, the operator usually lends to the fund without interest (a qard). The IFSB reports that the Gulf (GCC) countries wrote about 60 percent of global takaful contributions in 2024. Saudi Arabia, where insurers work under a cooperative model designed to fit Islamic principles, and Malaysia are large markets. Islamic insurance assets grew 16.9 percent in the year to the third quarter of 2024, but they are still only about 1.4 percent of all Islamic finance assets (IFSB).
| Metric | Plain definition |
|---|---|
| Gross written premium (GWP) | All premiums from policies sold in the period, before reinsurance |
| Net earned premium | Premium kept after reinsurance, for cover given in the period |
| Loss ratio | Claims divided by earned premium |
| Expense ratio | Commissions and running costs divided by premium |
| Combined ratio | Loss ratio plus expense ratio; below 100 percent means an underwriting profit |
| Investment yield | Investment income divided by invested assets |
| Solvency ratio | Capital held divided by the capital the regulator requires |
| Persistency or retention | Share of customers who renew or keep paying (life insurers in India report 13th month persistency) |
| Value of new business (life) | Expected profit from policies sold this year, in today's money |
So-what
For P&C and health cases, start with the combined ratio. For life cases, start with new business volume, persistency, and investment returns.
Why can an insurer with a combined ratio of 102 percent still make a profit?
Sources for this lesson (3)
- Islamic Financial Services Board: Islamic Financial Services Industry Stability Report 2025 (official)
- IFRS Foundation: IFRS 17 Insurance Contracts (official)
- Recognized public explanations of case-interview concepts and frameworks
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