Cash-Secured
Put

What is a cash-secured put?

A cash-secured put is the disciplined version of selling a put: you write one out-of-the-money put option, collect the premium, and set aside enough cash to actually buy the underlying at the strike price should the put be assigned. You are paid to take on the obligation to buy a stock you would happily own — but only at a lower price.

There are two good outcomes. If the stock stays above the strike, the put expires worthless and the premium is pure profit. If it falls below the strike, you are assigned and buy the shares at the strike, but your effective cost is the strike minus the premium — a built-in discount. The risk profile is identical to a naked short put; what makes it “secured” is the earmarked cash that guarantees you can honour the purchase.

Key takeaways

• A cash-secured put is a bullish-to-neutral income trade — you want the stock flat, up, or only mildly down.
• Your reward is capped at the premium; the put must stay out of the money for the full payoff.
• If assigned, you buy the stock at the strike, with effective cost = strike − premium.
• The cash set aside covers the purchase, so you are never caught short of funds.
• The loss below breakeven is stock-like and large — only a price of zero floors it.

How a cash-secured put works

The construction is a single leg: sell one OTM put on a stock or index you are happy to own, choosing a strike below the current price. You receive the premium immediately. To make it cash-secured, you reserve cash equal to the strike times the lot size — the amount you would need to take delivery. Above the strike at expiry, the put expires worthless and you keep the premium; below it, you buy at the strike.

Because you are short an option, the exchange blocks SPAN + exposure margin rather than the full strike value, but a true cash-secured writer keeps the rest idle as a buffer. Time is your ally: every day the stock holds above the strike, theta decay erodes the put in your favour, and a drop in implied volatility helps too. NIFTY and Bank Nifty puts are cash-settled, while many single stocks are physically settled — meaning an in-the-money put genuinely delivers shares into your account at expiry.

The numbers that matter

Worked NIFTY example

Suppose NIFTY is near 22,500 and you would be content to gain exposure around 22,200. You sell the 22,200 put for a premium of ₹110. With a lot size of 75, you collect ₹110 × 75 = ₹8,250 up front and earmark roughly ₹16.65 lakh (22,200 × 75) of notional cash (illustrative figures):

• Breakeven: 22,200 − 110 = 22,090.
• Max profit: ₹8,250, kept in full if NIFTY expires at or above 22,200.
• Below 22,090: you take stock-like losses, ₹75 per point.

NIFTY at expiry	Outcome	P&L (1 lot)
23,000	Put expires worthless	+₹8,250
22,200 (strike)	Put expires worthless	+₹8,250
22,090 (breakeven)	Assigned	₹0
21,800	Assigned at 22,200	−₹21,750
21,500	Assigned at 22,200	−₹44,250

Notice the trade-off: a fixed, modest income against a large but bounded downside. You are paid to stand ready to buy — which is fine as long as you genuinely want the underlying at that price.

When to use a cash-secured put

• You are bullish to neutral and would happily own the underlying at a lower price.
• Implied volatility is elevated, fattening the premium you collect.
• You want to generate income on idle cash while waiting for a better entry.
• You have the capital and intent to take delivery if assigned — not just to chase premium.

Risks to respect

• Large downside: a sharp drop below breakeven hands you stock-like losses, capped only by zero.
• Opportunity cost: a strong rally leaves you with just the premium while the stock runs away.
• Assignment timing: a physically settled put delivers shares you must hold or sell, possibly at a loss.
• Tying up capital: the cash you reserve earns little while it backs the position.

Cash-secured put vs covered call

These two are mirror images and form the classic “wheel.” A cash-secured put gets you paid to enter a long position at a discount; a covered call gets you paid to exit a long position at a premium. Their payoff diagrams are nearly identical — both cap the upside at the premium and carry stock-like downside. Sellers often run them in sequence: write a put, take delivery if assigned, then write calls against the shares.

Cash-secured put vs bull put spread

A cash-secured put carries open, stock-like downside in exchange for the full premium. A bull put spread buys a lower put to cap that downside, sacrificing some premium for defined risk. If you truly want to own the underlying, the cash-secured put is the right tool; if you only want the income without delivery risk, the spread is the safer, capital-light alternative.

Common adjustments

If the trade moves against you, you can roll the put — buy it back and sell a later-dated or lower-strike put to collect fresh premium and push out breakeven. If you no longer want delivery, simply buy the put back to close. Many income traders systematise this into the wheel, alternating cash-secured puts and covered calls to harvest premium across cycles.

Frequently asked questions

Is a cash-secured put bullish or bearish?

Bullish to neutral. You profit if the stock holds above the strike, and you are willing to buy it at the strike if it falls.

What is the maximum profit on a cash-secured put?

The premium received. It is realised when the underlying expires at or above the strike and the put expires worthless.

What happens if a cash-secured put is assigned?

You buy the stock at the strike using the cash you set aside. Your effective cost is the strike minus the premium collected.

How is a cash-secured put different from a naked put?

The payoff is identical, but the cash-secured version earmarks enough cash to fund the purchase if assigned, so you are never caught short of funds.

The bottom line

The cash-secured put is one of the most sensible income trades on the market: you get paid to wait for the underlying at a price you like, and if it never gets there, you simply keep the premium and repeat. The discipline lies in the word “secured” — only sell puts on stocks or indices you genuinely want to own, with the cash truly set aside. Skip that, and it becomes a naked put dressed up as a plan.

Related strategies & terms

• Covered Call — the income mirror that gets you paid to exit a long position.
• Bull Put Spread — a cash-secured put with the downside capped by a long put.
• Long Put — the buyer's side, a defined-risk bearish bet.
• Assignment · Theta · Breakeven