Buffett on insurance float
Warren Buffett emphasized that insurance float must be acquired cheaply through profitable underwriting and warned that losses can outweigh the benefit of float. The clip circulated on social media and drew attention from investors and industry observers. (x.com)
Insurance float is the money an insurer holds after collecting premiums and before paying claims, and Warren Buffett has long said it only helps if the insurer does not lose money getting it. (berkshirehathaway.com) Buffett described float in Berkshire Hathaway’s 2007 shareholder letter as “free” only when underwriting breaks even, and he said underwriting can swing between profits and losses. Berkshire’s 2024 letter said its float reached $171 billion at year-end 2024. (berkshirehathaway.com, berkshirehathaway.com) Berkshire’s 2025 annual report put year-end 2025 float at $176 billion, up from $171 billion at the end of 2024 and $88 billion at the end of 2015. Vice Chairman Greg Abel wrote that Buffett had used insurance float since Berkshire bought National Indemnity in 1967. (berkshirehathaway.com) The basic insurance math is simple: if premiums are greater than claims and expenses, the insurer earns an underwriting profit before it invests a dollar. Buffett wrote in Berkshire’s 2023 annual report that underwriting profit “adds to” the investment income from float. (berkshirehathaway.com) Insurance analysts track that discipline with the combined ratio, which compares claims and expenses with premiums. The Insurance Information Institute says a combined ratio under 100 means underwriting profit, while a ratio over 100 means underwriting loss. (iii.org) That distinction sits at the center of Buffett’s warning. Berkshire’s 2022 annual report said the cost of float is measured by the net pre-tax underwriting loss as a percentage of average float, which means cheap funding can turn expensive if claims and expenses outrun premiums. (berkshirehathaway.com) Buffett has used the same framework for decades. In his 1999 letter, he said Berkshire took a $1.4 billion underwriting loss that left float with a 5.8 percent cost that year. (berkshirehathaway.com) The recent clip resonated because Berkshire’s insurance business remains the company’s financial engine even after it grew into railroads, utilities, manufacturing, and a stock portfolio worth hundreds of billions of dollars. Berkshire’s 2025 annual report still led with the insurance operation and the float it generates. (berkshirehathaway.com) Buffett’s point was not that float is automatically valuable. It was that float works like borrowed money only when the insurance business is disciplined enough to make that money cheap — or, in Berkshire’s best years, better than free. (berkshirehathaway.com, berkshirehathaway.com)
