Insurance Float

Insurance Float refers to the funds that an insurance company holds between the time premiums are collected and the time claims are paid. Since Berkshire can invest these funds for its own benefit, float acts like an "interest-free loan" from policyholders.

📍 Origin

The concept was most clearly defined in the 1977 Letter in the context of the growing reinsurance business.

"Reinsurance generates unusually high funds for investment as a percentage of premium volume... This 'float' is a source of capital that costs us nothing, as long as we maintain a breakeven underwriting result."

📅 Chronological Evolution

• 1967_Acquisition: The Beginning.

  • Context: The purchase of National Indemnity Company.
  • Logic: This was Buffett's first entry into insurance. He realized the power of float as a recurring source of capital that could be used to buy Generals and other high-return assets.

• 1977 Letter: The Cost of Float.

  • Shift: Buffett begins to quantify float as a comparison to bank debt.
  • Quote: "If our underwriting is profitable, the cost of float is less than zero. If we have a slight underwriting loss, we are essentially 'borrowing' money at a rate far lower than any bank would charge."

• 1980 Letter: Interest Rates and Float.

  • Evolution: As interest rates rose in the late 70s, the value of float increased dramatically.
  • Strategy: Buffett highlights that float is most valuable when Underreserving is avoided, as "fictional" float (from understated reserves) eventually leads to a liquidity crisis.
  • Quote: "We value float highly, but only if it is gathered with discipline. To chase volume at the cost of underwriting losses for the sake of 'getting more float' is a primary sin of the insurance business."

• 1994 Letter: Float Crosses $3 Billion — At Zero Cost.

  • Float: $3.057 billion at year-end (up from $2.625B in 1993). Cost: zero — Berkshire recorded an underwriting profit for the second consecutive year.
  • The Super-Cat Caution: Buffett issued a critical warning alongside the good news: 1994 "should be regarded as close to a best-case" for the super-cat business. The California earthquake (Northridge) was the only significant loss. Results this favorable are not the trend-line; they are the positive tail of a volatile distribution.
  • Worst-Case Framing: For the first time, Buffett publicly quantified Berkshire's worst-case super-cat exposure: ~$600M after-tax — slightly exceeding annual earnings from non-insurance sources. He told shareholders: "If you are not comfortable with this level of exposure, the time to sell your Berkshire stock is now."
  • Quote: "Though we have a fine insurance business, it is not as good as it currently looks."

• 1998 Letter: The General Re Transformation — Float Doubles Overnight.

  • Context: The acquisition of General Re for ~$22 billion in Berkshire stock added approximately $14.9 billion to Berkshire's float in a single transaction — the single largest float addition in the company's history to that point.
  • Strategic Logic: Buffett framed the acquisition not primarily as an earnings purchase, but as a structural float enhancement. General Re's global reinsurance relationships gave Berkshire access to risk flows it could not have originated organically. Combined with Ajit Jain's reinsurance division and GEICO's auto float, Berkshire now operated the most powerful insurance complex in the world by float scale.
  • The Discipline: Buffett disclosed immediately and candidly that the deal was all-stock — diluting existing shareholders — and that per-share intrinsic value gains were far below the 48.3% aggregate book value headline. The float was real; the per-share gains were not.
  • The Caution: Shortly after acquisition, General Re's underwriting culture would prove to have eroded from its historical standards — a problem that would surface acutely in 1999–2001 and require intervention. See General Re, Noah Rule.

• 2013 Letter: "Dumb" Competition & Structural Strength.

  • Growth: Float grew to $77 billion.
  • Advantage: Underwriting profits were achieved for the 11th consecutive year, meaning this massive pool of capital carried a negative cost.
  • The Warning: Buffett warned that the reinsurance market was being flooded with "dumb" capital (hedge funds searching for yield), which would hurt industry pricing, but Berkshire's discipline allowed them to wait out bad pricing environments.

• 2015 Letter: The Mature Institution.

  • Float: $87.722 billion (up from $83.921B in 2014).
  • The 13-Year Streak: 13th consecutive year of underwriting profit. Cumulative underwriting gain since 2003: $26.2 billion. Paid $24.5B in claims to 6M+ claimants during 2015.
  • Methodological Change: Buffett changes the per-share intrinsic value calculation to include underwriting income for the first time — because the streak has proven the income stable enough to count as business earnings, not catastrophe-dependent windfalls.
  • The GAAP Paradox: GAAP records float as a liability at full face value. In reality, this is deeply conservative: if the float is permanent and costless, it is a form of interest-free capital.
  • The Float Composition: Ajit Jain's reinsurance: $44.1B. General Re (Tad Montross): $18.6B. GEICO (Tony Nicely): $15.1B. Other Primary (incl. Berkshire Hathaway Specialty Insurance): $9.9B.

• 2016 Letter / 2016 Meeting: The $100 Billion Milestone.

  • Float: $91.577 billion at yearend — and crossed $100 billion via a single mega-policy during the year.
  • 14-Year Streak: 14th consecutive year of underwriting profit. Cumulative underwriting gain since 2003: $28 billion pre-tax.
  • Float Composition: BH Reinsurance (Ajit): $45.1B. General Re (Kara Raiguel / Tad Montross): $17.7B. GEICO: $17.1B. Other Primary (incl. Berkshire Hathaway Specialty Insurance): $11.6B. Total: $91.6B.
  • Float in Low Rates: At the 2016 Meeting, a high school freshman asked whether float loses its value in a negative interest rate environment. Buffett's answer: "Float is not worth as much to insurance companies now as it was 10 or 15 years ago. But it's worth considerably more to us than to the typical insurance company, because we have a broader range of options as to what to do with it."
  • Float as a Call Option: In a key meeting exchange, Munger articulated a new framing: Berkshire deliberately accepts small expected underwriting losses in certain reinsurance segments to preserve a permanent pool of capital. "We're willing to pay a little money now to have certainty of having a lot of money available in a difficult time." Buffett: "It's an option cost. And that option came in handy in 2008 and '9."
  • The GAAP Paradox Persists: With float crossed over $100B, the divergence between GAAP (liability) and economic (asset) treatment is at its widest ever. Buffett: "It's shown as a liability, but it's actually a huge asset."

• 2017 Letter: The $114 Billion Milestone and the AIG Deal.

  • Float: Exploded from $91 billion to $114.5 billion.
  • The AIG Driver: The massive increase was largely driven by a single retroactive reinsurance deal with AIG, which paid Berkshire a world-record premium of $10.2 billion to assume $20 billion in long-tail liabilities.
  • The Streak Broken: The 2017 hurricane season (Harvey, Irma, Maria) generated $3 billion in losses for Berkshire, officially ending the 14-year streak of underwriting profitability. Despite this, the float remained essentially free capital over the long term.

• 2025 Meeting: The Negative-Cost Confirmation and Competitive Supremacy.

  • Float Cost: Ajit Jain reported the all-inclusive cost of float across Berkshire's entire insurance operation (including life insurance): negative 2.2%. "That means we've got the float plus somebody's given us 2.2% of cash."
  • Competitive Context: PE firms (Blackstone, Apollo, KKR) have entered life insurance aggressively, forcing Berkshire to "put up the white flag" in that segment. But in property-casualty: "There is no property casualty company that can basically replicate Berkshire." Ajit: "Clearly we are heads and shoulders above anyone else."
  • Buffett's Banking Metaphor: "It's like running a bank where people leave their money with you and you pay a minus 2.2% and you don't have any check clearing or anything else to do."
  • New JV: Berkshire-Zurich-Chubb joint operation for very large liability placement — leveraging float scale to write risks "that very few people can do."
  • The Strategic Arsenal: Combined with ~$335B in cash and treasuries (including ~5% of the entire US Treasury market), float makes Berkshire's capital position historically unprecedented.

🔗 Connections

• Concept: Underreserving, Capital Allocation, Insurance Principles, Retroactive Reinsurance
• Entity: National Indemnity Company, GEICO, Ajit Jain, General Re, Berkshire Hathaway Specialty Insurance, Kara Raiguel, Tony Nicely
• Source: 1977 Letter, 1980 Letter, 1994 Letter, 1998 Letter, 2013 Letter, 2015 Letter, 2016 Letter, 2016 Meeting