What A Hedge Actually Costs You

"Just hedge it" sounds like a free way to sleep better. It isn't. Every hedge costs something, and the biggest cost is usually the one that doesn't show up on a trade ticket: the expected return you were earning from the exposure you just cancelled out. Add that to the visible costs — commissions, financing, borrow fees on a short hedge leg — and a hedge that seemed obviously worth putting on can turn out to be a bad trade in its own right.

The four costs

Direct trading cost. Commissions and bid-ask spread on entering and later unwinding the hedge — small per trade, but real if you hedge and re-hedge often.

Financing cost. If the hedge is a short position or a levered instrument, you pay financing on it, exactly as you would on any other short or leveraged position.

Borrow cost. If the hedge vehicle itself needs to be borrowed to short (an ETF, a stock), you pay the borrow fee for as long as the hedge is on.

Opportunity cost. This is the one people forget. If the exposure you're hedging away has a positive expected return — equities on average do, most risk premia do by design — hedging it out means giving up that expected return for the length of time the hedge is on, whether or not the risk you were worried about ever shows up.

Worked example

You hold a $10m equity position with an expected annual return of 8 percent (roughly the long-run equity risk premium plus a bit of alpha) and you hedge out the market beta with a 3-month index future because you're worried about a specific event risk.

• Opportunity cost: giving up 8 percent annualized on the hedged notional for 3 months is $10{,}000{,}000 \times 0.08 \times 0.25 = 200{,}000$, about $200,000.
• Futures financing embedded in the roll: roughly 20bp annualized on $10m for 3 months, $10{,}000{,}000 \times 0.002 \times 0.25 = 5{,}000$.
• Commissions on entry and exit: a few hundred dollars, call it $800.

Total cost of running this hedge for the quarter: roughly $205,800 — over 2 percent of the position's value, for three months of protection. That's the real price of "just hedge it," and it needs to be weighed honestly against what you're actually worried about, not treated as a free option.

When the cost is worth it

The hedge is worth it if the probability-weighted loss you're protecting against, times how much of it you'd actually avoid, exceeds the total cost. If you believe there's a genuine 15 percent chance of a 20 percent drawdown around a specific event, that's an expected loss of $10{,}000{,}000 \times 0.15 \times 0.20 = 300{,}000$ on the unhedged position — bigger than the $205,800 cost, so the hedge clears the bar. But that comparison has to actually be made, explicitly, rather than assumed — a vague sense of "better safe than sorry" isn't a probability estimate, and plenty of hedges get put on without anyone doing this arithmetic at all.