13 Nov 2026
What Is a Put-Write ETF, and How Does It Generate Income?
A put-write ETF is a fund that sells put options on an index or stock and holds cash or Treasury bills as collateral, collecting option premiums plus interest on the collateral. If the underlying index stays flat or rises, the fund keeps the premium; if the index falls below the option’s strike price, the fund pays the difference, absorbing losses that can be partly offset by the premium. Because the strategy earns premium and interest while giving up gains above the premium, its return pattern resembles that of a covered call strategy on the same index.
What is a put option?
A put option gives its buyer the right, but not the obligation, to sell an underlying asset at a set price, called the strike price, on or before a set date. The seller of the put, also called the writer, receives a payment called the premium. In exchange, the seller agrees to buy the asset at the strike price, or for cash-settled index options, pay the difference between the strike and the index level, if the index finishes below the strike.
Investors buy puts to hedge against declines. Put sellers take the other side, earning premium for accepting that risk.
How does a put-write strategy work?
A typical put-write fund follows a repeating cycle:
Hold collateral. The fund keeps cash or short-term Treasury bills equal to the full amount it could owe if the index fell to zero. This is why the strategy is often called cash-secured put writing.
Sell puts. The fund sells put options on an index, often at or near the current index level, with expirations ranging from a day to a month.
Collect income. The fund receives option premium and earns interest on its collateral.
Settle at expiration. If the index finishes at or above the strike, the puts expire worthless and the fund keeps the premium. If it finishes below, the fund pays the shortfall.
Repeat. The fund sells new puts for the next period.
What does the payoff look like?
Consider a fund that sells a one-month at-the-money put on an index at 100 and receives premium equal to 2% of the index level. (Hypothetical, before fees and expenses, excluding interest on collateral.)
Index finishes at 105. The put expires worthless. The fund earns the 2% premium. It does not participate in the 5% gain.
Index finishes at 100. The put expires worthless. The fund earns 2%.
Index finishes at 95. The fund pays 5 points and keeps the 2-point premium, for a net result of about minus 3%.
Index finishes at 80. The fund pays 20 points and keeps 2, for a net result of about minus 18%.
The fund’s gains are limited to the premium plus interest, while losses grow as the index falls further below the strike, reduced only by the premium collected.
How does put writing compare with covered calls?
A covered call fund owns stocks and sells call options on them. A put-write fund holds cash and sells puts. Under a relationship in options pricing known as put-call parity, owning an index and selling an at-the-money call produces a payoff similar to holding cash and selling an at-the-money put on the same index with the same expiration. Our article on what is a covered call ETF explains the call side.
In practice, the two differ in several ways:
Source of income. Covered call funds collect dividends from stocks plus call premium. Put-write funds collect interest on collateral plus put premium. When short-term interest rates are higher, collateral income is higher.
What the fund holds. Covered call funds hold stocks; put-write funds hold Treasury bills or cash.
Tax character of income. Interest on Treasury bills is generally ordinary income, while stock dividends may be qualified. Option gains and losses on certain broad-based index options are generally taxed under Section 1256 as 60% long-term and 40% short-term capital gain or loss.1
Distributions. The mix of interest, option gains and any return of capital determines distribution character. Return of capital is a tax classification that applies when distributions exceed a fund’s earnings and profits; it reduces the shareholder’s cost basis rather than being taxed as income when received.
What has the index history shown?
Cboe calculates the S&P 500 PutWrite Index, which tracks a hypothetical strategy of selling monthly at-the-money S&P 500 puts collateralized by Treasury bills. From July 1986 through August 2023, Cboe reported an annualized return of 9.40% for the index, compared with 9.91% for the S&P 500, with a standard deviation of returns of 10.26% versus 15.38%, and a maximum drawdown of minus 32.66% versus minus 50.96%.2 The index tended to lag in sharply rising markets and to decline less than the S&P 500 in many falling periods. Index results are hypothetical, exclude fees and trading costs, cannot be invested in directly and do not predict future results. Our article on buy-write and put-write indexes compares several benchmarks.
What are the risks?
Equity downside. In a significant decline, losses can be large, reduced only by premium and interest.
Limited upside. Gains are capped at premium plus interest, so the strategy can lag substantially in strong rallies.
Volatility. Premiums fall when implied volatility is low, reducing income. Our article on implied volatility and option income explains the link.
Interest rates. Collateral income falls when short-term rates fall.
Distribution variability. Distributions can change and may include return of capital as a tax classification.
Frequently asked questions
Is selling puts riskier than owning stocks?
Over a single period, an at-the-money cash-secured put has downside similar to owning the index, reduced by the premium received, with gains limited to that premium plus interest. It is not leveraged when fully collateralized. The main difference from owning stocks is the trade-off: lower upside in exchange for income. Risk depends on strike selection, frequency and market conditions.
What does cash-secured mean?
Cash-secured means the put seller holds enough cash or Treasury bills to cover the maximum amount it could owe at expiration. For an index put, that is the strike price times the contract multiplier. Holding full collateral avoids borrowing or leverage. The collateral also earns interest, which forms part of the strategy’s return alongside option premium.
Why do put-write funds hold Treasury bills?
Treasury bills are short-term U.S. government debt that serve as collateral for the puts the fund sells. They are liquid and pay interest, so the fund earns income on its collateral while it waits for options to expire. Some funds hold cash or money market instruments instead. The interest earned rises and falls with short-term rates.
How is put-write income taxed?
It depends on the fund’s holdings. Interest on Treasury bills is generally ordinary income for federal purposes, though it may be exempt from state tax in some cases. Gains and losses on certain broad-based index options are generally subject to Section 1256 treatment. Distribution character is reported on Form 1099-DIV. A tax advisor can explain the effect for a specific situation.
Do put-write and covered call ETFs perform the same?
Their payoffs are similar in theory when using the same index, strike and expiration, because of put-call parity. Results can differ because of dividends versus interest income, strike selection, timing of option sales, fees, taxes and trading costs. Investors should compare each fund’s methodology, holdings and total return rather than assume identical outcomes.
What happens in a market crash?
If an index falls sharply below the puts’ strike price, a put-write fund owes the difference at expiration, and its net asset value declines by that amount minus the premium collected. Losses in a severe decline can be substantial. Because the fund sells new puts after each expiration, its subsequent exposure starts from the new, lower index level.
- Internal Revenue Code Section 1256; IRS Publication 550, “Investment Income and Expenses.”
- Cboe, “Generating Income and Managing Risk: Cash-Secured Put Writing in a Low Equity Return Environment,” Cboe Insights, 2023.
Cite this page: Adam Patti, "What Is a Put-Write ETF, and How Does It Generate Income?," VistaShares, updated November 13, 2026, https://www.vistashares.com/what-is-a-put-write-etf/. Plain-text version.
This material is provided for educational purposes only. It is not investment, legal or tax advice, and it is not a recommendation or an offer to buy or sell any security. Information is drawn from sources believed to be reliable as of the date of publication, is not guaranteed as to accuracy or completeness, and may change without notice. Figures attributed to third parties are their estimates. Projections and forecasts are not guarantees of future results. Investors should consult their own financial, legal and tax professionals before making investment decisions. Investments involve risk, including possible loss of principal. Strategies that use options involve additional risks, including limited participation in market gains, the risk that options do not perform as intended, and changes in distributions. Tax treatment depends on individual circumstances and on current law, which may change.