Trading term
What is Cash drag?
Cash drag is the cost of leaving money uninvested. Cash doesn't fall in nominal terms, but inflation reduces what it buys — so a large idle balance quietly shrinks in real value while it waits.
Cash looks safe on a statement because the number never goes down. What the number can't show is that the same amount buys less each year. Inflation across the OECD area ran at 4.2% in the year to June 2026, so money sitting at close to zero interest lost roughly that much of its purchasing power over twelve months.
The arithmetic is simple and worth doing on your own balance. Take the share of your portfolio that's in cash, multiply it by the inflation rate, and you have the annual cost. It's small on a 2% cash position and substantial on a 30% one. The same money invested might have gone up or down — the point isn't that investing always wins, it's that cash's stability is nominal only.
Cash held for a reason isn't drag at all. Money you'll need within a few years, or an emergency fund you can't afford to watch fall in value, is doing exactly the job you gave it. That erosion is the price of not having to sell something at a bad moment. Drag is the balance with no job — the leftovers from a sale, the deposit that never got invested, the amount waiting for a better entry point that hasn't arrived.
For example
You hold $20,000, of which 30% — $6,000 — sits in cash earning nothing. At 4.2% inflation, that $6,000 buys about $252 less by the end of the year. Your statement still reads $6,000.
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Idle cash is the loss that never looks like a loss, which is why it survives so long. Nobody reviews a balance that hasn't fallen. Meanwhile the money is out of the market for however long the pause lasts, so the cost is the inflation plus whatever it missed — and that second part never shows up on a statement either.
⚠ "Waiting for a better price" is a position too
Cash parked while you wait for a dip feels like caution rather than a choice, so it doesn't get reviewed the way a fund would. It's still a bet — one that pays off only if prices fall soon enough to cover what the wait costs. Give every cash balance a purpose and a date, and check it as often as you check anything else.