How to Hedge Your Stock Portfolio Against a Crash
Every common way to protect a stock portfolio, from cash and bonds to puts, collars and trend rules: how each works, what it costs, and how it actually behaved in 2008, 2020 and 2022.
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How Much Does It Cost to Hedge a Portfolio?
Every hedge is paid for somehow: a premium, capped upside or lower long‑run returns. Here is what puts, collars, bonds, cash and trend rules have cost historically, and the cheaper ways investors reduce risk.
Key takeaways
- Hedging costs a premium (puts), upside (collars) or long‑run return (cash, bonds). Cboe’s put‑protected S&P 500 back‑test had lower annualized returns than the index over 35 years, with 18 monthly drops of 6% or more instead of 35.
- Put premiums depend on strike, time and implied volatility. Protection tends to cost most right after markets have already fallen.
- Safer assets charge through lower returns: T‑bills (BIL) earned 2.1% a year over the 10 years to Sep 30, 2026, against 15.2% for the S&P 500 (Exent’s data).
- The cheapest risk reduction is usually sizing: trimming concentrated positions and holding a mix you would not sell in a crash.
How much does it cost to hedge with puts?
A put costs a premium paid upfront, and the price rises with three things: how close the strike is to today’s price, how long the protection lasts, and how volatile the market expects to be (implied volatility). A protective put that is never needed simply expires, and the premium is gone.
The real cost shows up when protection is renewed again and again. The table below is an illustrative way to think about it, not a quote.
| Illustrative put program on a $500,000 portfolio | Premium per roll | Rolls per year | Cost if no put pays off |
|---|---|---|---|
| 3‑month put, 10% below the market | 1.0% | 4 | ≈4% a year ($20,000) |
| 3‑month put, 5% below the market | 2.0% | 4 | ≈8% a year ($40,000) |
| 1‑year put, 10% below the market | 4.0% | 1 | ≈4% a year ($20,000) |
Illustrative premiums only. Real prices change daily with implied volatility, interest rates and dividends, and are usually higher after a selloff. Put payouts in a crash offset part of the cost; the question is whether they offset enough over many years.
How much have puts dragged on returns historically?
Historically, a permanent put program cut both losses and returns. Cboe’s benchmark‑index review (July 2021) covers the S&P 500 5% Put Protection Index (PPUT), a back‑test that holds the S&P 500 and buys a one‑month put 5% below the index every month. Over 35 years from June 1986, the S&P 500 had 35 monthly declines of 6% or more and PPUT had 18. PPUT also had fewer strong up months, a beta below 0.75 and lower annualized returns than the S&P 500.
Academic work is harsher. Roni Israelov’s “Pathetic Protection” (Journal of Alternative Investments, 2019) found that put‑protected portfolios had worse peak‑to‑trough drawdowns per unit of expected return than portfolios that simply held less stock. Puts protect best when a fall lines up with their expiry date; real drawdowns rarely do.
Options also carry their own risks: expiry, liquidity, assignment and tax rules. The OCC’s Characteristics and Risks of Standardized Options is the required reading before trading them.
What do the main hedges cost?
Each hedge charges in a different currency. Figures are Exent’s data as of Sep 30, 2026, unless marked.
| Hedge | How you pay | What history shows |
|---|---|---|
| Protective puts | Premium, renewed each expiry | Fewer deep monthly losses but lower returns (Cboe PPUT back-test, 1986–2021) |
| Collars | Gains above the call strike | Low upfront cost; a strong rally is given away |
| Inverse ETFs | Losses when markets rise; daily-reset drift | Built for one-day goals; multi-day results can differ sharply (SEC) |
| Long Treasuries (TLT) | Low or negative return in rising-rate years | +13.4% in Feb–Mar 2020; −31.2% in 2022 |
| T-bills (BIL) | Return given up vs stocks | 2.1% a year vs 15.2% for SPY over 10 years |
| Gold (GLD) | Volatility of its own | −0.9% in Feb–Mar 2020; 11.7% a year over 10 years |
| Trend filter (backtest) | Whipsaws and missed rebounds | 9.4% a year vs 15.2%; −7.7% vs −19.4% in Feb–Mar 2020 |
Inverse ETF note: the SEC’s investor bulletin explains that most reset daily, so returns over longer periods can differ from the stated multiple. More in inverse ETFs as a hedge. The trend filter is a hypothetical backtest from July 2016 that switches SPY to T‑bills below its 10‑month average; see its strategy page.
How can I hedge my portfolio cheaply?
The lowest‑cost hedge is usually not a product. It is reducing the risks you are not paid for. Single‑stock risk is the clearest example. In Exent’s crash replay of large US stocks, 220 of 349 fell more than the S&P 500 index’s 56.5% drop in the 2007–09 financial crisis, and 338 of 464 fell more than its 25.4% drop in the 2022 bear market. Spreading a concentrated position across more holdings lowers that risk without paying a premium.
Diversification is not completely free either. Assets that held up in falls, such as T‑bills, usually earned less over time. And correlations tend to rise in selloffs: in the same data since mid‑2016, 11 of 12 common diversifiers (all but T‑bills) were more correlated with the S&P 500 across all months than in calm months alone. What actually diversifies has the full table.
Other low‑cost tools investors use: rebalancing back to target weights, a cash buffer sized to near‑term spending, and an allocation whose worst historical loss you could hold through. Knowing which positions drive your portfolio’s loss in a crash tells you what is worth protecting before you pay for protection. Every approach is laid out in how to hedge a portfolio.
Are collars a cheaper way to hedge?
A collar lowers the upfront cost by selling a call to pay for the put, so the price moves from premium to upside. Cboe’s CLL back‑test, for example, holds the S&P 500, buys puts 5% below the index each quarter and sells calls 10% above it each month. That limits losses within each option cycle and also caps gains above the call strike.
A “zero‑cost” collar is only zero‑cost on the day it is opened. Over many years, the gains given up in strong rallies are the bill. A put spread cuts cost a different way: it protects only between two strikes, so a very deep fall is not covered below the lower one.
How to weigh a hedge’s cost against what it protects
- Put the possible loss in dollars first: a stress test of your current holdings shows what a 2008 or 2022 repeat would cost.
- Price the hedge per year, not per trade. Illustrative: 4% a year on $500,000 is $20,000, every year it is renewed.
- Compare it with simply holding less of the risky asset. Research has found that this often protects as well for less.
- Check the timing risk: a hedge that expires, resets daily or lags can miss the fall it was bought for.
- Remember taxes and trading costs, and read the options risk disclosure before using options.
How to see what is worth hedging with Exent
- Upload a screenshot of your holdings, or a CSV, Excel, PDF or Google Sheet; no brokerage login.
- Exent replays the portfolio through 2008, 2020, 2022 and 2025 and shows which positions drive the loss.
- Trim the riskiest positions or add cash in the what-if simulator to compare that with paying for a hedge, before you trade.
Frequently asked questions
It depends on the strike, the time to expiry and implied volatility, and it changes daily. Puts closer to the current price, with longer terms or bought after a selloff, cost more.
Historically, yes. Cboe’s put-protected S&P 500 back-test from 1986 to 2021 had fewer deep monthly losses but lower annualized returns than the S&P 500.
Reducing unpaid risks, such as a single oversized stock, costs no premium. Holding a mix of assets and rebalancing also helps, though safer assets usually earn less over time.
No upfront premium is paid, but the gains above the call strike are given up. Over time, missing strong rallies is the cost.
Cash has no premium, but it costs return. In Exent’s data, T-bills earned 2.1% a year over the 10 years to Sep 30, 2026, against 15.2% for the S&P 500.
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Educational content, not investment advice. Examples are illustrative; past performance does not guarantee future results.