Cash as a Strategic Position, Not a Drag

Berkshire Hathaway held $397.4 billion in cash and short-term Treasury bills as of March 31, 2026, per its first-quarter 10-Q — roughly 59% of the company's investable portfolio sitting in instruments that, on a real basis, most years barely keep pace with inflation. Critics call it a drag. Warren Buffett and now Greg Abel have never treated it as one.

That's the tension worth sitting with. Cash earns close to nothing in real terms most of the time, and yet the investors who've compounded capital most successfully over the longest stretches have often held more of it, not less, than conventional portfolio theory would recommend. The resolution isn't that cash is secretly a great asset class. It's that "a drag on returns" and "a strategic position" are answers to two different questions — and conflating them is where most of the bad advice on this topic comes from.

I've come to think the honest way to treat cash is the same way you'd treat any other position: size it deliberately, know what job it's doing, and stop pretending that holding none of it is automatically the more sophisticated choice.

The Real Cost of Holding Cash

Start with the cost, because pretending it doesn't exist is its own kind of dishonesty. Three-month Treasury bills have returned an average of roughly 3.3% annually since 1928, against average inflation of close to 3% over the same stretch — a real return hovering near zero across the full century, per the historical return data Aswath Damodaran publishes annually at NYU Stern. Cash is not a wealth-building asset. It never has been.

The opportunity cost is sharper still against equities. The S&P 500 has compounded at roughly 10% annually in nominal terms across that same long stretch, meaning every dollar left in cash rather than deployed into quality businesses has, on average, given up several percentage points of annual return, compounding invisibly over decades. That gap is real, and it's the correct starting objection to any argument for holding meaningful cash.

The cost also isn't evenly distributed across time, which is where the simple "cash is a drag" framing breaks down. Hold 20% cash through a decade like the 2010s bull market and the drag is severe and continuous. Hold the same 20% heading into 2000 or 2008 and it looks, in hindsight, like foresight rather than caution — even though nobody holding it in January of either year actually knew what was coming. That asymmetry is uncomfortable, because it means the payoff to holding cash depends heavily on when you're forced to evaluate it, and nobody gets to pick their measurement window in advance.

So why hold any at all, given a cost that's real and sometimes severe? Because the average masks everything that actually matters — sequencing, drawdown timing, and your own behavior under stress.

What Cash Actually Buys You

Cash held deliberately does three jobs that a fully invested portfolio can't do on its own: it buys optionality, it funds a pre-committed drawdown plan, and it acts as a behavioral buffer against forced selling at the worst possible moment. Each is worth separating out, because they get bundled together in most cash conversations and they don't behave the same way.

Optionality is the clearest case. On September 23, 2008, at the height of the financial crisis, Berkshire Hathaway agreed to buy $5 billion of Goldman Sachs preferred stock carrying a 10% dividend — a deal only available to an investor holding cash when panic had frozen capital markets for everyone else. Goldman repurchased the preferred at a 10% premium in March 2011, handing Berkshire roughly $500 million a year in dividends in the meantime, plus warrants that added billions more in profit. No amount of stock-picking skill substitutes for having the capital available at the moment the opportunity exists, and that moment rarely announces itself in advance.

The dry-powder case is the one most investors reach for, but the behavioral case matters just as much and gets far less attention. Over the twenty years ending December 31, 2024, the average equity fund investor earned roughly 9.24% annually, against the S&P 500's 10.35%, according to DALBAR's Quantitative Analysis of Investor Behavior — a gap driven almost entirely by mistimed withdrawals and re-entries rather than by fund selection. A cash reserve sized to your actual spending needs means you're never forced to sell equities into a drawdown at exactly the point where selling is most costly, which is precisely the behavior that data is measuring. Not a return-generating function. A permanent-loss-of-capital-avoidance function. Those aren't the same thing, even though they tend to get evaluated with the same return-on-cash math.

There's a third, quieter job cash does: it changes how you read the news. An investor with eighteen months of spending needs sitting in cash reads a bad earnings quarter or a market selloff differently than one who's fully invested and watching a mortgage payment become a live question. The first investor can afford to be analytical. The second is, understandably, reading for reassurance. That difference in posture shows up in decisions, not just in feelings.

A Framework for Deciding How Much Cash to Hold

There's no single right percentage, and I'd be skeptical of anyone who hands you one without first asking about your situation. The right allocation depends on three variables, and they interact with each other more than most cash guidance admits.

• Time horizon and liquidity needs. Money you'll need within two to three years belongs in cash or near-cash instruments regardless of what markets are doing, independent of any strategic argument for holding it.
• Portfolio concentration. A portfolio built on eight or ten high-conviction positions, sized the way we've described in our [conviction-tier framework](/blog/position-sizing-by-conviction), often needs a larger cash buffer than an already-diversified, index-like portfolio, because the individual holdings carry more idiosyncratic risk cash exposure can't offset on its own.
• Behavioral honesty. If you've sold into past drawdowns, a larger cash buffer that keeps you from touching your equity positions is worth more to your actual long-run returns than whatever the "optimal" allocation a spreadsheet would recommend.

Most individual investors land somewhere between 5% and 15% of the portfolio in cash, with the number moving toward the higher end for those closer to needing the money and toward the lower end for younger investors with long horizons and stable income. That range isn't a prescription. It's a starting point for the conversation you should be having about your own situation, not a target worth hitting for its own sake. And the number should move as your circumstances do — a cash allocation set five years ago and never revisited is a decision made once and never re-examined, which is its own quiet failure of discipline.

Cash Isn't a Verdict on the Market

The one place cash-as-strategy breaks down is when it quietly becomes a market call instead of a position. Holding 10% in reserve because you've sized your liquidity needs and your behavioral tendencies honestly is a decision. But holding 40% because you think stocks are expensive and you're waiting for a better entry point is market timing wearing a risk-management costume. Nothing more.

The distinction matters because it changes what would make you change your mind. A deliberately sized cash position doesn't move just because the market had a good year — it moves when your liquidity needs, time horizon, or risk tolerance change, or when a rebalancing rule you set in calm markets gets triggered. A market-timing cash position moves whenever your conviction about near-term prices shifts, which in practice means whenever you're anxious. That's decision discipline in the first case and its opposite in the second, and the two can look identical from the outside while meaning completely different things about the process behind them.

I'm genuinely less certain than I'd like to be about where the line sits for any individual reader between a prudent reserve and timing dressed up as prudence. The honest test I keep coming back to: could you write down, in advance, the specific condition that would make you deploy the cash — a valuation level tied to your opportunity cost math, a personal liquidity event, a rebalancing trigger? If you can't name the trigger, you're probably not holding a position. You're holding a feeling, and feelings make poor portfolio inputs no matter how reasonable they sound in the moment.

Key Takeaways

• Cash's opportunity cost is real — T-bills have returned close to zero in real terms over the past century, and the gap against equities compounds meaningfully over decades. Don't pretend otherwise.
• Cash held deliberately does three jobs a fully invested portfolio can't: it buys optionality for moments like Berkshire's 2008 Goldman Sachs preferred stock deal, funds a pre-committed drawdown plan, and prevents forced selling at the worst possible time — the exact behavior DALBAR's investor-behavior data shows costing the average investor over a full percentage point annually.
• Size cash to your actual time horizon, portfolio concentration, and your own demonstrated behavior under stress — not to a single "optimal" percentage that ignores your situation.
• The test for whether cash is a position or a market call: can you name, in advance, the specific condition that would make you deploy it? If not, it's not decision discipline. It's anxiety with a spreadsheet.