The Float Business: How the Best Companies Get Paid Before They Do Any Work
And why understanding this one concept could change every stock you ever look at
Here’s a question most investors never think to ask: what if you could build a wildly profitable business without ever putting up your own money?
Not through debt. Not through equity raises. Not through some financial engineering trick that makes your CFO nervous. What if your customers millions of them simply handed you cash upfront, before you delivered the product, and while you held that cash over the following weeks, months, or years, you invested it, made a return, and kept the difference? What if the business model itself was specifically designed to use other people’s money as its primary fuel?
That’s the float. And it’s probably the single most underappreciated concept in all of investing.
Most people who hear the word “float” think of Warren Buffett, nod vaguely, and move on. That’s a mistake. Because float isn’t just a quirk of insurance companies it shows up in membership businesses, subscription platforms, asset managers, and retailers. It’s hiding in balance sheets that most investors read backwards. And the companies that generate the most durable float tend to compound capital at rates that quietly embarrass the rest of the market over a full decade. Today we’re going to pull back the curtain on exactly how it works, what it looks like in the numbers, and how to spot it yourself before the stock moves.
First, The Problem: You’ve Been Reading Balance Sheets Wrong
Standard finance education teaches you that liabilities are bad. Debt is bad. Obligations are bad. The less a company owes, the better. And for most companies, that’s directionally correct debt costs money, it amplifies downturns, and it can sink you when rates spike.
But there is a special category of liability that flips this logic entirely. It’s the money companies collect from customers before they’ve done anything to earn it. An insurance premium paid in January covering you through December. A Costco membership fee charged in January before you’ve touched a single rotisserie chicken. A software subscription billed annually upfront. On the balance sheet, all of this shows up under “deferred revenue,” “unearned premiums,” or “policyholder reserves” a liability, technically, because the company hasn’t yet delivered what you paid for.
Here’s what most investors miss: that liability cost the company absolutely nothing to acquire. No interest payments. No equity dilution. No covenants. No maturity schedule. You just gave them your money voluntarily, because you wanted what they were selling and while they hold it, they get to put it to work.
Now compare that to how a traditional manufacturer funds its operations. They buy raw materials on credit, pay workers weekly, carry inventory for months, and only get paid 30-60 days after they’ve shipped the product. Every phase of the production cycle requires capital. To grow revenue by 20%, they need to fund 20% more working capital meaning debt, equity raises, or retained earnings that could have gone to shareholders. Growth is capital-intensive by design.
A float business works in reverse. The customer funds the operation. Growth generates more float. More float generates more investment income. The machine feeds itself.
The Buffett framing of this is precise: “insurers receive premiums upfront and pay claims later this collect-now, pay-later model leaves us holding large sums that will eventually go to others. Meanwhile, we get to invest this float for our own benefit.” The genius isn’t in the insurance. The genius is in recognizing that the insurance product creates a structurally free source of permanent capital.
The Numbers That Will Make This Click
Let’s work through the math concretely, because this is where most explanations stop too soon.
Take a simple example. An insurance company collects $100 in annual premiums. Over the course of the year, it pays out $85 in claims and operating expenses. That leaves a $15 underwriting profit fine, not exciting. But here’s what the income statement doesn’t show you directly: that $100 in premium was sitting in the company’s investment portfolio for an average of six months before claims were paid. If the company earns 5% on its investments, that’s $2.50 in investment income on top of the $15 underwriting profit. And in a good year where underwriting is especially tight, you can have a situation where investment income exceeds underwriting profit meaning the insurance business itself is almost irrelevant. The real product is the float.
The metric that captures this is the combined ratio claims plus expenses, divided by premiums. A combined ratio below 100% means the insurer made a profit on underwriting alone, before touching the investment income. Above 100% means underwriting lost money, but investment income from the float may still make the overall business profitable.
The elite underwriters run combined ratios well below 100%, consistently, across years. Progressive, for example, more than doubled net income to $8.5 billion in 2024, running a combined ratio of 88.8 for the full year meaning they spent only 88 cents of every premium dollar on claims and costs. They pocketed 12 cents on the underwriting side, and then invested the entire float on top of that. Chubb’s 2025 results were even more striking P/C underwriting income hit a record $6.5 billion on a combined ratio of 85.7.
What makes this almost obscenely powerful is scale and time. Berkshire Hathaway’s float has grown from $46 billion in the early 2000s to $176 billion at year-end 2025. That’s $176 billion in permanently available, interest-free investment capital and Berkshire didn’t borrow a cent of it. Every year, millions of policyholders renew their coverage, new customers sign up, and the float grows. Buffett has been investing this pool for 50+ years, compounding it at ~20% annually, and the result is a company worth over a trillion dollars that started as a struggling New England textile mill.
The critical insight: over two decades, Berkshire’s insurance businesses generated $32 billion of after-tax profits from underwriting about 3.3 cents per dollar of sales after income tax. Meanwhile, the float grew from $46 billion to $171 billion. The underwriting profit is nice. The float is the point.
It’s Not Just Insurance: Float Is Everywhere Once You Know Where to Look
Most people, when they hear “float business,” immediately think of Berkshire and stop there. That’s leaving serious money on the table, because the float concept shows up in at least four other business models that generate it just as reliably often without the catastrophe risk that comes with property and casualty insurance.
The Membership Float
Costco is not a retailer. That’s the most important thing to understand about Costco, and almost no one frames it correctly. Costco is a membership club that happens to sell things at near-cost, using the membership fee as its only meaningful profit source.
Virtually all of Costco’s operating income derives from the $4.6 billion in membership fees, while the $237.7 billion in merchandise sales essentially just covers operational costs. The entire retail operation buying, storing, stocking, selling runs roughly at break-even. The profit engine is the annual membership fee, collected upfront every year, before members have spent a dollar on groceries.
But Costco has a second layer of float that most people miss entirely: the inventory financing float. Costco turns inventory 12.4 times per year selling through stock in just 26-27 days while negotiating 30-60 day payment terms with suppliers. The math here is quietly remarkable: customers pay Costco for the goods before Costco pays the supplier. At Costco’s scale, that gap represents billions of dollars in interest-free financing from the supplier network, growing automatically every year as revenues grow. It’s negative working capital as a structural feature, not an accident.
Costco’s US and Canada membership renewal rate sits at 92.9% a moat signal that tells you this float is essentially permanent. It doesn’t evaporate in a recession. It doesn’t require new customers. It just keeps renewing, quietly funding the operation year after year.
The Asset Manager Float
This one is more sophisticated, and it’s why certain alternative asset managers those that manage insurance company assets, pension funds, or annuity liabilities are genuinely different animals from traditional fund managers.
The traditional asset manager collects a 1% fee on AUM. Fine business. But the fee is earned continuously on assets that can leave at any time. The float here is thin.
The modern alternative asset manager that has cracked the float code does something smarter: it acquires or partners with insurance companies that generate long-duration liabilities annuities, life insurance policies, pension obligations. Those liabilities can last 20-30 years. The insurance company holds the float; the asset manager invests it in higher-returning private credit, infrastructure, or real assets; the spread between the liability cost and the investment return is pure economic profit. Crucially, that float is sticky. Annuity holders don’t switch managers. Pension obligations don’t run. The capital is as close to permanent as anything in modern finance gets.
Apollo represents the modern evolution of the float concept: Athene collects long-duration annuity liabilities life insurance float rather than P&C float and invests them in private credit assets originated by Apollo’s platform. This is why Apollo looks cheap on traditional PE metrics the market keeps valuing it like a cyclical fund manager when the insurance float model makes it structurally closer to a bank that can invest its deposits in higher-returning private assets.
The Subscription Float
Software companies figured this out quietly in the 2010s. Annual subscription billing, collected upfront, generates deferred revenue on the balance sheet technically a liability, practically an interest-free loan from customers. The best SaaS companies grow their deferred revenue faster than their revenue, meaning they’re collecting money faster than they’re earning it, and investing the difference in growth. The float isn’t as large or as durable as insurance float, but for high-retention subscription businesses with net revenue retention above 120%, it’s real and it compounds.
The Five-Point Float Checklist
Here’s your repeatable framework. Run any company through these five questions before you decide what multiple it deserves.
1. Does the company collect cash before delivering value? Look for insurance premiums, annual subscriptions, membership fees, gift card balances, advance deposits, or deferred revenue growing over time on the balance sheet. If any of these exist, float exists.
2. Is the float growing faster than the underlying business? Float that compounds faster than revenue signals that the company is collecting more upfront capital per dollar of eventual service pricing power and float growth together. That’s the holy grail.
3. What does the float cost? For insurers: look at the combined ratio. Below 95% consistently means the underwriting itself is profitable the float is cost-free or even negatively priced (they get paid to hold your money). For membership businesses: look at the CAC-to-LTV ratio and renewal rates. If 92% of members renew annually and the membership costs $65, the effective cost of float is near zero.
4. How does management invest the float? This is the art. Berkshire invests float in equities and operating businesses 15-20% annual returns over decades. Most insurers park float in short-duration investment-grade bonds 4-5%. The spread between those two outcomes, compounded over 30 years, is the difference between a good business and a legendary one. Find management teams with a clear, long-term investment philosophy for the float.
5. Is the float permanent or episodic? A one-time project advance from a client isn’t float. But a business with 90%+ annual renewal rates, growing its float organically every year, has something that is functionally indistinguishable from permanent equity capital except it shows up as a liability.
Three Float Businesses Worth Understanding Right Now
Berkshire Hathaway (BRK.B) The textbook case, but the numbers still shock
People think they understand Berkshire. They mostly don’t. They think of it as a stock portfolio with an insurance business attached. It’s the opposite: it’s an insurance float machine with an investment portfolio attached. Berkshire’s insurance subsidiaries generated about $11.4 billion in underwriting profit in 2024 alone one of the best results in the company’s history while maintaining a total float of roughly $171 billion.
Here’s the number that almost nobody focuses on: insurance investment income grew from $9.6 billion in 2023 to $13.7 billion in 2024, as Berkshire deployed its float into short-term Treasuries during the high-rate environment. That $13.7 billion generated entirely from investing other people’s money exceeds the annual revenue of most Fortune 500 companies. And Berkshire didn’t need to sell a product, hire a salesperson, or open a factory to earn it. They just... held the float and collected the coupon.
The underappreciated angle on Berkshire right now: with the float at $176 billion and growing, and with rates still elevated, the investment income line alone can generate $12-15 billion annually before Buffett’s successor invests a single dollar in equities. The floor on earnings is remarkably high.
Progressive (PGR) Float growing at machine speed
Progressive doesn’t get enough credit as a float story because people focus on the car insurance angle. But Progressive’s model is specifically engineered to grow float as fast as possible while keeping the underwriting machine profitable.
Progressive’s stated annual goal is explicitly to grow as fast as it can while achieving a 96 combined ratio, in other words, maximize float growth subject to a profitability constraint. In 2024, they ran an 88.8 combined ratio while growing premiums 21%. They were 7 points better than their own target. That means they were capturing float faster than planned, at a lower-than-expected cost.
What most people don’t realize: Progressive’s direct-to-consumer model is actually a float advantage. When you buy insurance directly rather than through an agent, the policy gets written faster, the premium clears faster, and the float sits on Progressive’s balance sheet rather than in some agency’s account for a few days. At $74 billion in annual premiums, even days of float acceleration are worth hundreds of millions of dollars annually.
Markel Group (MKL) The Berkshire blueprint for patient investors
Markel is the clearest case of someone explicitly reading Buffett’s manual and running the experiment at a smaller scale. Its model combines specialty insurance underwriting with a long-term investment portfolio and a growing roster of non-insurance businesses earning premiums from niche lines and deploying the float alongside retained earnings.
The specialty angle is the key differentiator. Markel doesn’t compete with Geico on personal auto. It insures summer camps, equine veterinarians, specialty contractors, and professional liability for architects markets so niche that the major carriers don’t bother, competition is thin, and pricing power is exceptional. This focus on specialty lines has historically produced underwritten profits, with a combined ratio averaging below 95% over the past decade.
Management estimated intrinsic value at $2,610 per share at year-end 2024 against a stock price of $1,726 a 34% discount to intrinsic value by the company’s own calculation. When management of a float business tells you the stock is 34% cheap and backs it up with a share repurchase program, that’s worth paying attention to. The float funds the buybacks. The buybacks reduce shares outstanding. The remaining shareholders own a larger slice of a growing float. That’s a compounding wheel that runs itself.
Why This Changes Everything About How You Build a Portfolio
The practical takeaway is this: when you’re comparing two businesses with identical growth rates, identical margins, and identical management quality, always pay a premium multiple for the one that generates float. Always. Because the float is an off-balance-sheet asset that the accounting doesn’t capture, a source of capital that the income statement doesn’t show, and a competitive advantage that compounds invisibly for decades.
The best float businesses tend to share three characteristics that make them genuinely different from the rest of the market. First, they get more valuable as they grow more float means more investment capital means more investment income means stronger earnings. Second, they’re remarkably durable in downturns premiums and memberships already collected don’t evaporate when the economy weakens. And third, management’s capital allocation skill matters enormously the same float, invested at 15% versus 5% over 30 years, produces wildly different outcomes for shareholders.
The market discounts float businesses incorrectly in two directions. Sometimes it ignores the float entirely, pricing an insurer purely on underwriting earnings without crediting the investment income a common mistake with small specialty insurers. And sometimes it prices the float correctly but underweights management’s ability to grow it missing the fact that float that compounds at 15% for 20 years doesn’t just add linearly, it explodes.
Spotting this before the market does is exactly the kind of edge that separates portfolios that beat benchmarks from portfolios that track them.