Money received is not yet free profit
An insurer may receive a premium before an indemnity and related expenses become payable. While the funds are under its control, they can finance investments. But they also represent future obligations to policyholders. Cash remaining after premiums are collected therefore cannot all be treated as shareholders’ earnings or as money that can safely be withdrawn from the business.
Float is often discussed using Berkshire Hathaway as an example. In its 2025 annual report, the company defines float as an approximate amount of net policyholder funds generated by underwriting and held for investment. It includes several insurance obligations less certain related assets. This is the company’s specific definition, not a universal line in every insurer’s financial statements.[1]
Premium, obligation and investment asset
Premium received, insurance revenue recognized, estimates of future claims and invested funds are different categories. They cannot be treated as equal without analyzing the relevant accounting rules and contract. Part of a premium may relate to coverage not yet provided, while estimates of incurred losses can change as information arrives. Cash payment and expense recognition can also occur in different periods.
Start with the [balance sheet](/guides/balance-sheet/) and notes on insurance obligations. Then separate underwriting results from investment results. High investment income does not automatically make insurance profitable if future claims and expenses exceed earned premiums. Conversely, a positive underwriting result does not eliminate investment or interest-rate risk.
An illustrative funding-cost model
Take a simplified one-year example with no taxes or discounting. Earned premiums are 100 units, while claims and related period expenses are 102. The underwriting result is −2. If average float for the same period is 50, the notional funding cost, defined as the underwriting loss divided by average float, is 4% per year.
This is a deliberately specified metric, not a universal regulatory-reporting formula. It helps show that retained funds can have an economic price. If insurance expenses were 98, the result would be a profit of 2 and the notional funding cost under the same definition would be −4%. The negative sign means that underwriting itself produced a profit in this model; it does not mean future obligations disappeared.
Suppose investment income for the period is 3. In the first scenario, the simple sum of underwriting loss and investment income is +1 before other items. In the second, it is +5. That addition does not test asset quality, reserve accuracy or future liquidity. An insurance business is not safe merely because one year’s combined figure is positive.
Why average float matters more than one ending point
If funds rise sharply at year-end, the ending balance poorly represents the amount available for investment during the year. Comparing the annual result with it may understate the notional funding cost. An educational model is better served by a time-weighted average, with the approximation stated explicitly. If the definition of float changes, first build a comparable bridge between the versions.
Growth in float is also ambiguous. It may reflect business expansion, large-contract features or the accumulation of future claims. Growth alone says nothing about the profitability of the risks accepted. Quality requires underwriting terms, development of prior-loss estimates and stability across several periods. Do not equate growth in obligations with growth in shareholder value without analyzing the reverse side.
Payment timing and ability to invest
A long expected claims horizon is different from guaranteed freely available long-term money. Actual losses may require cash sooner, and estimates may change. In a stress scenario, claims can rise while investment assets fall. Comparing average investment returns with an average funding cost is therefore insufficient: a calendar of cash needs and liquid reserves is also required.
For a specific organization, restrictions on investing and withdrawing funds come from applicable regulation and its documents. This guide does not claim that foreign practice or Berkshire’s definition is available to every Russian insurer. When reading the source, check country, accounting standard, exact metric definition and the section on restrictions on distributions to owners.[1]
The short definition of [insurance float](/glossary/strahovoy-float/) helps maintain the boundary between temporary funding and earned profit when comparing reports.
Questions to ask instead of admiring cheap money
Ask for a reconciliation of float to the balance sheet, average volume for the period, a split between underwriting and investment results, reserve development and a scenario of accelerated claims. Do not transfer one company’s historical success to every industry participant. The connection with [cash flows](/guides/cash-flow-statement/) helps reveal timing rather than only profit. The main conclusion is that float can be an important funding source, but its value depends on the price of the obligations accepted and the ability to meet them in adverse conditions.
Sources and review boundaries
[1] [Berkshire Hathaway Annual Report 2025](https://berkshirehathaway.com/2025ar/2025ar.pdf). Definition of float in a specific report, not a universal insurer metric.