How to Sell Cash-Secured Puts: Complete Step-by-Step Guide

A cash-secured put (CSP) is an options strategy where you sell a put option while holding enough cash in your account to buy 100 shares if assigned. You collect premium upfront and either keep it when the put expires worthless or acquire shares at a price below the current market. Either outcome can be profitable when executed correctly.

This guide gives you the exact mechanics: what capital you need, how to choose the right stock, how to select a strike and expiration, how to place the order, and how to manage the trade from open to close. We will work through a complete example using AMD.

What Is a Cash-Secured Put?

When you sell a put option, you are agreeing to buy 100 shares of the underlying stock at the strike price if the buyer exercises the option. "Cash-secured" means you hold enough cash in your account to fulfill that obligation. This is different from a naked put, where you might not have the funds to cover assignment.

The mechanics are simple:

• You sell to open a put option and receive premium immediately.
• If the stock stays above the strike price at expiration, the put expires worthless. You keep the full premium. No shares change hands.
• If the stock falls below the strike price, you are assigned. You buy 100 shares at the strike price. Your effective cost basis is the strike price minus the premium you collected.

For a deeper conceptual overview, see our complete cash-secured put guide.

Capital Requirements

The capital your broker holds as collateral equals the strike price multiplied by 100. This is non-negotiable in a cash account. Here are some examples:

If you have a $25,000 account, you can comfortably sell CSPs on stocks with strike prices up to $250 (though position sizing rules suggest staying well below that). Smaller accounts should focus on stocks priced between $15 and $50 to allow diversification across multiple positions.

Step 1: Choose the Right Stock

Every CSP you sell is an agreement to buy 100 shares. You must be comfortable owning the stock at the strike price. Key selection criteria:

• Fundamental quality: Profitable company, growing revenue, reasonable valuation. Avoid speculative names with no earnings.
• Adequate implied volatility (IV): Target IV between 25% and 50%. Below 20%, premiums are too thin. Above 60%, the risk of large drops is elevated.
• Liquid options: Bid-ask spreads on the options should be under $0.15. Tight spreads mean better fill prices.
• No earnings within the contract period: Earnings announcements cause unpredictable gaps. Avoid having an earnings date fall between your trade date and expiration.

For our worked example, we will use AMD trading at $135. AMD has IV around 35%, excellent options liquidity, and strong fundamentals in the semiconductor space.

Step 2: Select Your Strike Price Using Delta

Delta is the single most useful metric for strike selection. Put delta (expressed as a negative number) approximates the probability that the put will be in the money at expiration. Here is the framework:

For income-focused CSP selling, −0.25 to −0.30 delta hits the sweet spot. You collect meaningful premium while maintaining a 70–75% probability of keeping that premium without assignment.

With AMD at $135, a −0.30 delta put at 45 DTE might land around the $125 strike. Explore how delta relates to probability and premium in our Delta Lab.

Step 3: Choose Your Expiration (The 30–45 DTE Sweet Spot)

Time decay (theta) is your primary edge when selling options. Theta decay is not linear—it accelerates dramatically in the final 30 days before expiration. By selling options at 30–45 days to expiration (DTE), you capture the steepest part of the theta decay curve.

Here is why 30–45 DTE is optimal:

• Under 14 DTE: Gamma risk increases sharply. Small stock moves cause large swings in your option's value. Delta can shift rapidly, turning a safe trade into a dangerous one overnight.
• 15–29 DTE: Theta is high, but you have less time to manage or roll if the stock moves against you.
• 30–45 DTE: The ideal range. Theta decay is accelerating, premium is rich enough to justify the trade, and you have ample time to roll or adjust if needed.
• Over 60 DTE: Premium is higher in absolute terms, but theta decay is slow. Your capital is tied up longer for marginal additional return.

For our AMD example, if today is March 5, we would look at the April 17 expiration (43 DTE). This falls squarely in the sweet spot.

Step 4: Place the Order

Here are the exact steps to place a CSP order in your brokerage:

1. Navigate to the options chain for AMD. Select the April 17 expiration.
2. Find the $125 put in the put column. Note the bid and ask prices. Let's say the bid is $3.10 and the ask is $3.30.
3. Select "Sell to Open." This is critical. "Sell to Open" creates a new short position. "Sell to Close" is for closing an existing long position.
4. Set quantity to 1 contract (100 shares worth of exposure).
5. Use a limit order. Never use market orders for options. Set your limit price at the mid-point between bid and ask: ($3.10 + $3.30) / 2 = $3.20. If it does not fill in 5–10 minutes, adjust down by $0.05 increments.
6. Review the order. Confirm: Sell to Open, 1 AMD April 17 $125 Put, Limit $3.20. Your broker will hold $12,500 in cash collateral.
7. Submit. Once filled, you receive $320 in premium, credited immediately to your account.

Use the cash-secured put calculator to run these numbers for any stock and strike combination.

Step 5: Manage the Position

Once your CSP is open, active management separates consistent winners from gamblers. Here are the three management rules you should follow:

Rule 1: Close at 50% profit

If you collected $320 in premium and the put is now worth $1.60 (half of $3.20), buy it back. You lock in $160 of profit and free your $12,500 in capital to sell a new put. Why close early? You captured half the premium in a fraction of the time. The remaining $160 takes disproportionately longer to earn, and you are exposed to directional risk the entire time.

In our AMD example, if after 15 days AMD has risen to $140, the $125 put might be worth $1.50. You "Buy to Close" at $1.50, netting $170 profit ($320 − $150) in 15 days instead of waiting the full 43 days for the remaining $150.

Rule 2: Roll when tested (for credit only)

If AMD drops to $126 with 10 days remaining, your put is "tested"—the stock is near or at your strike. You can roll:

1. Buy to Close the April 17 $125 put (now worth roughly $4.80).
2. Sell to Open a May 16 $125 put (worth roughly $6.50) in the same order ticket.
3. Net credit: $6.50 − $4.80 = $1.70 ($170 additional premium collected).

The golden rule: only roll for a net credit. If you cannot collect additional premium by rolling, it is better to accept assignment or close the trade for a loss.

Rule 3: Let assignment happen on quality stocks

If AMD drops to $118 and stays there through expiration, you will be assigned 100 shares at $125. Your effective cost basis is $125 − $3.20 = $121.80. Since you chose AMD because you wanted to own it at a discount, this is simply the next phase of the wheel strategy: you now transition to selling covered calls against your shares.

Step 6: Handle Assignment

Assignment happens automatically through your broker. Here is what to expect:

• Timing: Assignment typically occurs on the Saturday after expiration. You will see 100 shares of AMD in your account and $12,500 less cash on Monday morning.
• Early assignment: Rare for puts, but possible if the put is deep in the money and the remaining time value is minimal. Your broker will notify you.
• Cost basis: Your broker may or may not automatically adjust your cost basis for the premium collected. Keep your own records. In our example, the true cost basis is $121.80, not $125.00.
• Next step: Immediately begin evaluating covered call strikes. You want to sell a call above your $121.80 cost basis so that if shares are called away, you realize a profit.

Advanced Tips for Better CSP Results

• Sell on red days. Implied volatility and put premiums tend to spike when the market is falling. Selling CSPs on a day when the stock drops 2–3% often yields 20–40% more premium than selling on a green day. Fear inflates option prices; that fear is your edge.
• Avoid the week before earnings. IV expands ahead of earnings, which inflates premiums—but the directional risk of a post-earnings gap dwarfs the extra premium. Wait until after earnings to sell your CSP.
• Layer your expirations. Instead of selling all CSPs at the same expiration, stagger them. Sell one at 30 DTE, another at 37 DTE, a third at 45 DTE. This smooths out your premium income and reduces concentration risk.
• Track annualized yield, not absolute premium. A $200 premium on $5,000 collateral at 30 DTE is a better trade than $500 premium on $30,000 collateral at 45 DTE. Always calculate the annualized return to compare trades objectively.

CSP Risks to Understand

Selling CSPs is not risk-free. Here are the real risks and how to mitigate them:

• Stock drops significantly below your strike. If AMD crashes from $135 to $90, you still buy at $125. Your unrealized loss is ($121.80 − $90) x 100 = −$3,180. Mitigation: only wheel stocks you are willing to hold through a drawdown.
• Opportunity cost. The $12,500 in collateral could have been invested elsewhere. If the market rallies 15% while your cash is tied up earning 2.5% from premium, you underperformed. Mitigation: compare your annualized yield to the market's expected return.
• Gap risk. A stock can gap down on bad news, skipping past your breakeven. Mitigation: avoid selling CSPs ahead of binary events (earnings, FDA decisions, mergers).

Complete AMD CSP Timeline

Here is how the entire trade plays out in our best-case scenario:

Result: $170 profit in 15 days on $12,500 capital. Annualized: 33.1%. Your capital is now free to sell another put immediately, compounding your returns over time.