Put Selling Calculator
Calculate cash-secured put returns and break-even price from strike, premium, and margin. Enter values for instant results with step-by-step formulas.
Formula
Return on Cash = Premium / (Strike x 100) | Annualized = Return x (365 / DTE) | Break-even = Strike - Premium
Return on cash measures premium income as a percentage of the cash collateral required. Annualized return extrapolates the period return over a full year. Break-even price is the strike minus premium received, below which the position loses money.
Worked Examples
Example 1: Cash-Secured Put on Blue Chip Stock
Problem: Stock XYZ trades at $100. You sell 1 contract of a 30-day $95 put for $3.00 premium. Calculate returns and break-even.
Solution: Total premium = $3.00 x 100 shares = $300\nCash required = $95 x 100 = $9,500\nBreak-even = $95 - $3.00 = $92.00\nReturn on cash = $300 / $9,500 = 3.16%\nAnnualized return = 3.16% x (365/30) = 38.4%\nOTM percentage = ($100 - $95) / $100 = 5.0%\nEffective buy price if assigned = $92.00
Result: Premium: $300 | Break-even: $92.00 | Return on Cash: 3.16% | Annualized: 38.4%
Example 2: Multiple Contracts with Margin
Problem: Stock ABC at $50. You sell 5 contracts of a 45-day $47.50 put for $1.50 premium. Margin requirement is 20%.
Solution: Total premium = $1.50 x 5 x 100 = $750\nCash required (fully secured) = $47.50 x 500 = $23,750\nMargin required = $50 x 0.20 x 500 = $5,000\nReturn on cash = $750 / $23,750 = 3.16%\nReturn on margin = $750 / $5,000 = 15.0%\nAnnualized on cash = 3.16% x (365/45) = 25.6%\nAnnualized on margin = 15.0% x (365/45) = 121.7%\nBreak-even = $47.50 - $1.50 = $46.00
Result: Premium: $750 | Return on Cash: 3.16% | Return on Margin: 15.0% | Break-even: $46.00
Frequently Asked Questions
How do I choose the best strike price for selling puts?
The ideal strike price depends on your goals and risk tolerance. If your primary goal is income generation, choose strikes closer to at-the-money for higher premiums, accepting greater assignment risk. If you genuinely want to acquire the stock at a discount, choose strikes at or below your target buy price. A common approach is to sell puts at 5-10 percent out of the money, balancing decent premium with a meaningful discount if assigned. Look at technical support levels and choose strikes at or below those levels for additional safety. Delta can guide strike selection too: a 0.30 delta put has roughly a 30 percent chance of expiring in the money. Consider selling at the 0.20-0.30 delta range for a good balance of premium and probability.
What happens if a put I sold gets assigned?
When a put you sold gets assigned, you are obligated to buy 100 shares per contract at the strike price, regardless of the current market price. Your brokerage automatically deducts the cash and adds the shares to your account. Your effective purchase price is the strike price minus the premium you received. For example, if you sold a $95 put for $3 premium and get assigned, your effective cost is $92 per share. Assignment typically happens at or near expiration when the stock is below the strike, though early assignment can occur at any time (more common near ex-dividend dates). If you do not want to hold the shares, you can immediately sell them, though you may realize a loss if the stock has fallen significantly.
What is the break-even price on a cash-secured put?
The break-even price on a cash-secured put is the strike price minus the premium received. Below this price, the overall position starts losing money. For instance, selling a $95 strike put for $3 premium gives a break-even of $92. If the stock drops to $90 and you are assigned, you buy at $95 but effectively paid $92 after accounting for the premium, resulting in a $2 per share unrealized loss. Above $92, the position is profitable whether assigned or not. At exactly $95 you keep the full $3 premium and must buy shares at market price. Above $95 the option expires worthless and you keep the premium with no obligation. The break-even calculation is crucial for evaluating the risk-reward profile of each put selling trade.
How often can I repeat the put selling strategy?
You can sell puts as frequently as options expire, which can be weekly, monthly, or at other intervals depending on the available expiration dates. Many active put sellers use weekly options to generate income 52 times per year, rolling positions each Friday. Monthly cycles provide 12 opportunities per year with less management overhead. After each expiration, whether the put expires worthless or you get assigned and sell the stock, you can immediately sell another put. If assigned, some traders switch to selling covered calls on the acquired shares (known as the wheel strategy) before eventually selling the stock and returning to put selling. Consistent put selling can generate significant annual income, though returns vary based on market conditions and volatility levels.
What is the wheel strategy and how does put selling fit in?
The wheel strategy is a systematic income-generating approach that combines put selling and covered call writing in a continuous cycle. Step one: sell cash-secured puts on a stock you want to own. If the put expires worthless, you keep the premium and sell another put. Step two: if assigned, you now own the shares and begin selling covered calls against them. If the covered call expires worthless, sell another one. Step three: if shares are called away, you receive the strike price and return to step one. This wheel continues indefinitely, generating premium income at each stage. The strategy works best on quality stocks with moderate volatility and liquid options markets. It provides income in flat and mildly trending markets but can underperform in strong bull or bear markets.
How does implied volatility affect put selling returns?
Implied volatility (IV) directly impacts the premiums you receive when selling puts. Higher IV means the market expects larger price swings, which inflates option prices and increases the income you collect. When IV is elevated, such as during earnings season or market selloffs, put premiums can be two to three times higher than during calm periods. Smart put sellers look for situations where IV is above its historical average (high IV rank) to maximize income. However, higher IV also means greater actual risk of large moves. The ideal scenario is selling puts when IV is elevated due to temporary fear rather than fundamental deterioration. After major market drops, selling puts on quality stocks can be particularly lucrative as fear-driven IV spikes create outsized premiums.