Choosing the Strike and Expiration for a Cash-Secured Put
Reviewed by Leon Moyer - Published October 9, 2026 - Last reviewed October 9, 2026
In this lesson
Compare cash-secured puts at different strikes and expirations by premium, break-even, model chance of assignment and worst-case loss, and choose one that matches a price you would pay for the stock.
The best strike for a cash-secured put is a price at which you would be glad to own the stock, and the best expiration is one that pays enough premium for how long your cash will be tied up. Everything else is a trade-off between collecting more premium and being assigned more often.
This lesson compares three strikes and four expirations on the same stock, using model prices from the same pricing engine as the free OptionsPro profit calculator, so you can see the trade-offs in dollars.
How do you choose a strike price for a cash-secured put?
Start with the stock, not the premium. Decide what you would be willing to pay for 100 shares, and look at strikes at or below that price. A strike chosen only because it pays well can leave you owning a stock you never wanted, at a price you would not have paid.
Then compare the strikes near your price. With XYZ at $50 and 45 days to expiration, at 30% implied volatility:
Three XYZ puts to sell, 45 days out, with XYZ at $50
45 put (further out)
Collect $37, set aside $4,500
Break-even $44.63
47 put (closer)
Collect $80, set aside $4,700
Break-even $46.20
50 put (at the money)
Collect $196, set aside $5,000
Break-even $48.04
Gray line: zero, where the position breaks even. Dashed line: strike. Each sketch shows profit or loss at expiration as the stock price rises from left to right.
The pattern holds for any stock: a higher strike pays more premium, has a higher break-even, is assigned more often, and loses more if the stock collapses. A lower strike pays less but gives the stock more room to fall before you buy.
More premium means more chance of buying the shares
Premium collected, one contract
Model chance of finishing in the money
The chance figures come from the Black-Scholes model, which estimates the odds from implied volatility alone. They are a useful yardstick for comparing strikes, not a forecast of what the stock will do.
Worked example
Three cash-secured XYZ puts, 45 days out
XYZ trades at $50. You compare selling one 45, 47 or 50 put, each expiring in 45 days.
- The 50 put pays five times the premium of the 45 put, but it is assigned whenever XYZ finishes below $50, which the model puts at 50%.
- The 45 put is assigned less often (16% in the model), and it loses only $63 if XYZ falls to $44, but it earns just $37 if nothing happens.
- Every row carries a worst case above $4,400. Choosing a strike changes how often you buy the stock and at what price; it does not make the downside small.
Illustrative and hypothetical. The ticker and prices are invented for teaching, and the figures exclude commissions, fees, margin interest and taxes, which reduce real results. Past or hypothetical outcomes do not indicate future results.
What delta should you use for cash-secured puts?
Many put sellers use delta as a quick way to compare strikes. A put's delta shows roughly how much its price moves for a $1 move in the stock, and traders also read it as a rough gauge of how likely the put is to finish in the money. The 45, 47 and 50 puts above have deltas of about -0.13, -0.24 and -0.46.
A lower delta means a strike further below the stock: less premium, less frequent assignment. A higher delta means more premium and more frequent assignment. Delta is a convenient filter, but it should come second to the price you would actually pay. The Course 1 lesson What Is Delta in Options? How Option Prices Follow the Stock explains it in full.
How do you choose an expiration for a cash-secured put?
Longer expirations pay more premium in total, because the stock has more time to fall below the strike. They do not pay proportionally more per day, and they lock up your cash for longer.
The XYZ 47 put at four expirations
Premium collected, one contract
Premium per calendar day
For the 47 put, the 14-day contract pays $20 (a 0.4% return on the $4,700), the 30-day pays $53 (1.1%), the 45-day pays $80 (1.7%) and the 60-day pays $104 (2.2%). Per day, the 30, 45 and 60-day puts pay about the same, and the 14-day pays less, because a strike $3 below the stock is unlikely to be reached in two weeks.
Other things to weigh:
- Shorter expirations mean more decisions and more trades, and the put's value swings faster near expiration as the stock moves around the strike.
- Longer expirations tie up the cash longer and leave more time for bad news. The Course 1 lesson What Is Theta in Options? Time Decay in Dollars per Day explains how time decay speeds up near expiration.
- Events inside the window. An earnings report before expiration can move the stock far past your strike overnight. Check the date before you sell.
What else should you check before selling the put?
- Liquidity. Wide bid-ask spreads cost you on the way in and again if you buy the put back early. The Course 1 lesson Bid, Ask and the Spread - What Trading an Option Costs covers how to read them.
- Implied volatility. Higher implied volatility pays more premium because the market expects bigger moves. A rich premium is often a warning, not a gift.
- Your plan if assigned. Know whether you will hold the shares, sell them, or sell calls on them. Cash-Secured Put Assignment walks through each choice.
Check your understanding
Using the table, why does the 50 put lose $404 at $44 while the 45 put loses only $63?
Show answer
The 50 put obliges you to buy at $50, so it loses $600 at $44 before its $196 premium. The 45 put buys at $45, losing $100 before its $37 premium. A higher strike pays more but buys the stock at a higher price.
The 60-day 47 put pays $104 and the 30-day pays $53. Is the 60-day put twice as good?
Show answer
No. It pays about the same per day, ties up $4,700 for twice as long, and gives the stock twice as long to fall below $47. Its worst case is still about $4,600.
What should come first when choosing a strike: the premium or the price you would pay for the stock?
Show answer
The price you would pay for the stock. The premium is small next to the shares' value, so the strike should be a price at which owning the shares is acceptable.
Key takeaways
- Pick a strike at or below a price you would gladly pay for the stock; let premium and delta decide between strikes near that price.
- Higher strikes pay more, break even higher, are assigned more often and lose more in a fall. Lower strikes pay less and give more room.
- Longer expirations pay more in total but about the same per day past the first few weeks, and they lock up the cash longer.
- Every choice still carries a worst case of roughly the strike times 100 if the stock goes to zero.
Common questions
What is the best delta for cash-secured puts?
There is no single best delta. A put with a smaller delta, further below the stock price, pays less and is assigned less often; a larger delta pays more and is assigned more often. Start from the price you would pay for the stock, then check what delta that strike carries.
Should you sell cash-secured puts in the money or out of the money?
Most cash-secured puts are sold at or out of the money, below the current stock price, so the stock has to fall before you buy it. An in-the-money put pays more but is likely to be assigned, at a price above today's market.
What is the best expiration for cash-secured puts?
It depends on how long you are willing to tie up the cash and how often you want to make a decision. Longer expirations pay more in total but about the same per day past the first few weeks, and they give the stock more time to fall below your strike.
Should I sell cash-secured puts before earnings?
Premiums are often higher before earnings because the market expects a bigger move, and that move can go against you overnight. If an earnings date falls before expiration, size the trade for the stock gapping well below the strike.