A cash-secured put is an options strategy where you sell a put option on a stock you'd be happy to own, while keeping enough cash aside to buy it if assigned. You collect the premium upfront. Either the stock stays above your strike and you keep the premium, or it falls and you buy the stock cheaper than today.
Most beginners only know one way to buy a stock: place a buy order at the current market price. That works. But what if you could be paid to wait until the price drops to a level you actually like?
That's the entire pitch of a cash-secured put. You name a price you'd happily buy at, the market pays you a fee to wait, and either you collect that fee or you get the stock at your price. Both outcomes are ones you signed up for. There is a catch in the details, which we'll unpack below.
The mechanicsWhat a Cash-Secured Put Actually Is
Strip the jargon away and a cash-secured put has just three moving parts. Three boxes you have to tick before the trade is open.
Sell a put
Pick a stock you'd want to own. Choose a strike below today's price, at a level you'd happily buy at. Sell the put. The buyer pays you a premium upfront.
Set aside the cash
Keep strike × lot size in your account, untouched. This is the cash to buy the stock if the put gets assigned. No leverage. No surprise.
Wait for expiry
One of two things happens. The stock stays above the strike (you keep premium, no stock bought) or falls below (you buy stock at strike, premium offsets the cost).
That's it. There's no fourth step where things get complicated. The strategy's elegance is the entire point. Every outcome is something you agreed to before opening the trade.
The phrase "cash-secured" isn't decoration. It's the rule. Without the cash set aside, you're just selling a naked put, which is a very different animal. Leveraged, margin-called when the stock falls, and the fastest way to blow up a small account.
The cash-secured discipline: If you can't fund the full purchase at the strike price, the trade isn't cash-secured. It's a leveraged short put with extra steps. Don't lie to yourself about which one you're running.
A Worked Example: Reliance Industries
Let's run real numbers. Take Reliance Industries, India's largest listed company. Lot size is 500 shares. Say the stock is trading at ₹1,450 today, and you'd be happy to own it at ₹1,400, a price you've patiently waited for.
You sell one Reliance 1400 put expiring on the last Tuesday of next month, and the market pays you ₹25 per share in premium. (Premiums vary with volatility; ₹25 is illustrative of a slightly out-of-the-money monthly put on a large-cap stock.)
The ₹12,500 hits your account the moment the trade fills. It's yours either way. The only question now is whether Reliance closes above or below ₹1,400 in 30 days.
Scenario A: Reliance closes anywhere above ₹1,400
The put expires worthless. The buyer walks away because there's no point exercising the right to sell at ₹1,400 when the market price is higher. You keep the entire ₹12,500.
On ₹7,00,000 of capital set aside for one month, that's 1.78% in 30 days, or roughly 21% annualised if you repeat the trade. Not bad for sitting in cash you would have held anyway.
Scenario B: Reliance closes at ₹1,350 (or anywhere below ₹1,400)
The put is in-the-money. You get assigned. Since NSE stock options have been physically settled since October 2019, this is not a cash adjustment. Actual shares hit your demat account.
500 Reliance shares get credited to your demat on T+1. ₹7,00,000 gets debited (strike × lot). You now own Reliance at ₹1,400 a share, but you also kept the ₹12,500 premium, so your effective cost basis is ₹1,375 per share.
That's 5.2% below today's spot of ₹1,450. You bought a quality stock at a meaningful discount, in a market that just gave it to you. Whether that's a great trade depends on whether you actually wanted to own Reliance — which was the precondition for selling the put in the first place.
Above ₹1,400 at expiry
Put expires worthless.
You keep ₹12,500.
Cash freed. Repeat next month.
Below ₹1,400 at expiry
Put assigned. You buy 500 shares at ₹1,400.
Effective cost: ₹1,375/share.
You now own Reliance — at a discount.
Notice what's missing from both scenarios. There is no "I made a mistake" outcome. There's only "the market did A" or "the market did B", and both were planned for.
Visualise itThe Payoff, At Any Closing Price
Drag the slider below to see what happens to your P&L at any closing price for Reliance on expiry day. The flat line above ₹1,400 is the premium you keep. Below ₹1,400, you're long the stock — every rupee fall costs you ₹500.
Move the slider through ₹1,400 and watch the curve change character. Above the strike, your P&L is flat — you keep the premium no matter how high the stock goes. Below the strike, you're effectively long the stock, with the premium acting as a cushion.
This is what option sellers mean by "defined upside, defined-but-large downside." The premium is small relative to the stock's full value, but it's reliable. The risk is real, but it's bounded by something you can name: the strike price minus the premium, multiplied by the lot.
The reframeWhy Investors Actually Run This Strategy
There are three honest reasons. Notice that "easy money" isn't one of them.
1. Income on cash you'd hold anyway
If you've decided you want to own a stock at ₹1,400 and the market is at ₹1,450, you have two choices. You can place a limit buy order at ₹1,400 and wait, earning zero on the cash while you wait. Or you can sell a cash-secured put at ₹1,400 and earn the premium while you wait for the same fill price.
The second version pays you to do the same waiting. Over a year of repeated trades, that can compound to a meaningful return on capital that was otherwise idle.
2. A discount on the stock, if you get assigned
When the put assigns, your effective cost basis is strike minus premium. In the Reliance example, that's ₹1,375 instead of ₹1,400. You bought the stock at a price below the strike you were already willing to pay.
Over many trades, this can shave 1–3% off your effective purchase price on every position you ever build via puts. For a long-term investor, that's not nothing. It's the difference between average and good.
3. Forced discipline on entry price
This is the underrated one. Most retail investors don't have an entry-price discipline at all. They see a stock running up, panic about missing out, and buy at the top.
A cash-secured put forces you to name your buy price in advance. You have to commit to "I'll buy Reliance at ₹1,400, and only at ₹1,400" before the market does anything. The strike is your discipline.
The cash-secured put doesn't make you a better trader. It makes you a more disciplined buyer — by forcing you to write down the price you'll buy at before you have the chance to talk yourself into buying at the price the market is currently offering.
— Why entry-price discipline matters more than entry timingWhat You Give Up — The Honest Costs
Every options strategy that sounds clever has a price. The cash-secured put is no exception. Three costs you should price in before the first trade.
The upside is capped at the premium
If Reliance rallies from ₹1,450 to ₹1,800 in those 30 days, you don't participate. Your maximum profit is ₹12,500, the premium you collected. And that's it. The buyer of your put walks away, you keep the premium, and you stare at the stock you wanted to own running away from you.
This is the trade-off. You earn income while waiting for the dip. If the dip doesn't come, you earn the income but miss the rally.
The stock can fall far below your strike
You bought at ₹1,375 effective. What if Reliance closes at ₹1,200 a month later? Your assignment loss is ₹175 per share × 500 = ₹87,500. The premium you collected only cushioned the first ₹25 of the fall.
This is identical to the risk of having placed a limit buy at ₹1,400 and getting filled. The cash-secured put isn't a magic shield against downside — it's a slightly cushioned version of the same downside you'd have had buying outright.
The reality-check sizing question: can you hold the position calmly if the stock falls another 20% after assignment? If the answer is no, the strike is too high or the position is too big.
Capital is locked up while the trade is open
That ₹7,00,000 sitting aside isn't earning anything else for 30 days. If you would have otherwise parked it in a liquid fund earning 6.5% annualised, the opportunity cost is roughly ₹3,800. That's nearly a third of the premium gone before you've even celebrated.
The strategy only makes sense if the premium meaningfully beats your alternative use of that capital. Selling deep out-of-the-money puts that pay ₹3 of premium on a ₹2,000 stock? Not worth the lockup.
The mechanicsCash-Secured Puts on NSE — What's Different in India
Most cash-secured put articles you'll find online are written for the US market. A few things genuinely matter for the Indian retail trader.
Only stock options work, not Nifty or Bank Nifty
This is the most common mistake. Beginners read about the strategy, get excited, and sell a Nifty put. They discover at expiry that index options in India are cash-settled. There is no underlying share to take delivery of.
You can't run a "buy the stock at a discount" strategy on an instrument that doesn't deliver stock.
The strategy only makes sense on individual stock options, which are physically settled on NSE since October 2019. The current F&O stock list has 180+ names: Reliance, HDFC Bank, Infosys, TCS, ITC, and so on.
Lot sizes determine your minimum capital
Indian F&O contracts trade in fixed lot sizes set by NSE, calibrated so that one lot is roughly worth ₹5–10 lakh.
As an illustration, near-month lot sizes around May–June 2026 were: Reliance 500 shares, HDFC Bank 550, TCS 175, and ITC 1,600. Lot sizes change every few months, so always confirm the latest contract file on the NSE site before placing the trade.
Multiply by strike price to get your cash-secured capital. On a ₹4,200 TCS put, that's ₹4,200 × 175 ≈ ₹7.35 lakh per lot. On a ₹450 ITC put, ₹450 × 1,600 ≈ ₹7.2 lakh per lot.
Most cash-secured puts on F&O stocks lock up between ₹5 and ₹10 lakh per lot. That's the floor for this strategy in India.
SPAN margin vs. cash-secured (don't confuse them)
Your broker will only block SPAN + Exposure margin on a short put, typically 12–18% of the assignment value. That feels like free leverage. It isn't.
If you fund only the margin and the put assigns, you have a delivery obligation you can't meet. The broker will force-square or charge you penalties. "Cash-secured" means you keep the full strike × lot in your account regardless of what your broker requires. That self-imposed discipline is the entire point of the strategy.
Taxes and charges to budget for
When you sell the put, STT is charged on the option premium. As per NSE's current STT table, from April 1, 2026, sale of an option in securities is charged at 0.15% of the premium. If an in-the-money stock option is exercised at expiry, STT on the exercised option is charged at 0.15% of the intrinsic value. Physically settled stock derivatives may also attract delivery-style equity transaction charges, so always check the final broker contract note before treating a thin-premium trade as profitable.
Options Lab lets you run the cash-secured put through historical regimes — the March 2020 crash, the 2018 volatility spike, the calm grind of 2017 — and see what assignment actually feels like when the stock keeps falling after you've been put the shares. The article above tells you what the strategy does. The Lab lets you live through every awkward outcome before risking real money.
How to Actually Run a Cash-Secured Put — Step by Step
The strategy fits in five steps. Three are about the setup. Two are about discipline.
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Step 1 · The list
Build a watchlist of stocks you actually want to own
Before you sell a single put, write down 5–10 F&O stocks you'd be genuinely happy to own at the right price. Quality businesses, ones you've researched, ones you'd hold through a bad quarter. If the only reason you'd buy is "the premium is juicy," delete that name. The list is the strategy's foundation.
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Step 2 · The price
Pick a strike below the current price
For each stock, write down the price you'd happily buy at. A rule of thumb: 3–7% below the current market for a monthly expiry. The lower the strike, the lower the premium, but also the lower the chance of assignment — and the bigger the cushion if assigned.
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Step 3 · The expiry
Choose monthly, not weekly
Monthly stock options on NSE now expire on the last Tuesday of the month (since September 2025). If that Tuesday is a trading holiday, the expiry shifts to the previous trading day.
Stick with monthlies for cash-secured puts. They give the stock room to wiggle, decay smoothly, and don't require weekly management. Weekly options exist but are designed for shorter speculative trades.
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Step 4 · The cash
Park the full assignment value, untouched
Strike × lot size in cash, set aside before the trade. Not "I'll move money in if it assigns." Not "my broker only blocks the SPAN, so I have headroom." The whole amount, in the account, doing nothing else. This is the rule that turns a leveraged trade into an investing tool.
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Step 5 · The waiting
Do nothing until expiry, or close at 80% profit
Most cash-secured puts can be held to expiry. If the premium decays to 20% of what you collected with 1–2 weeks left, you can close (buy back the put) and free the capital early. Don't touch the trade if the stock falls and the put goes in-the-money. That was Scenario B, the one you signed up for.
Should I Sell This Put? — Quick Check
Plug in a real trade you're considering. The checker validates the setup — funded, willing, cushioned — and gives you an instant verdict.
You're funded, you'd own the stock at the strike, and the premium cushion is reasonable.
Educational only. The checker validates the structural setup of a cash-secured put. It does not predict outcomes, recommend trades, or replace your own due diligence on the underlying stock.
When a Cash-Secured Put Is the Wrong Strategy
The strategy is genuinely useful for income-oriented investors who want to enter quality stocks at a discount. It's a poor fit in several other situations. Be honest about which one you're in.
- You'd happily own the stock at the strike — and have cash to fund the purchase
- The stock is large-cap, liquid, and you understand the business
- Implied volatility is moderately elevated (richer premium)
- You have 30 days of patience and won't fiddle with the trade
- The expected return on premium meaningfully beats parking cash in a liquid fund
- You wouldn't actually want to own the stock at the strike
- You can't fund the full assignment value in cash today
- You're trying to "trade the premium" without an entry-price view
- The underlying is a small-cap, news-driven, or earnings-event stock
- You're using Nifty / Bank Nifty options (cash-settled — no stock delivered)
Notice the symmetry: every "do" has a matching "don't" on the other side. The strategy is more about the precondition than the execution. If the stock-and-strike combination is honest, the rest is mechanical.
Frequently Asked Questions
What is a cash-secured put?
A cash-secured put is an options strategy where you sell a put option on a stock you'd be happy to own, while keeping enough cash aside to actually buy the stock at the strike price if you get assigned. You collect the premium upfront. If the stock stays above the strike, the put expires worthless and you keep the entire premium. If it falls below the strike, you buy the stock at your target price, minus the premium you already received.
Can I do a cash-secured put on Nifty or Bank Nifty in India?
No. Index options like Nifty and Bank Nifty are cash-settled in India — there is no underlying share you can take delivery of. A cash-secured put only makes sense on stock options, which are physically settled on NSE since October 2019. If you sell an in-the-money index put at expiry, you settle in cash with no stock acquired.
How much cash do I need to keep aside?
Enough to buy one full lot of the stock at the strike price. If you sell one Reliance 1400 put with a lot size of 500 shares, you need to keep 1400 × 500 = 7,00,000 rupees aside. Your broker will only block the SPAN plus exposure margin (typically 12 to 18 percent of that amount) to open the trade — but the whole point of the cash-secured version is that you set aside the full assignment value yourself, so you can never be forced into a position you can't fund.
What is the maximum loss on a cash-secured put?
The theoretical maximum loss is the strike price minus the premium received, multiplied by the lot size — this is the loss if the stock falls to zero. In practice, a quality F&O stock going to zero is rare, but a 30 to 40 percent crash is not. The honest way to size this is: assume the stock can fall 25 percent below your strike, and ask if you can still hold the position calmly. If not, the strike is too high or the position size is too big.
What happens at expiry if I get assigned?
Since stock options on NSE are physically settled, you take delivery of the shares. 500 Reliance shares get credited to your demat account on T+1, and 7,00,000 rupees (strike × lot) get debited from your trading account. The premium you collected at trade initiation stays with you, which means your effective cost basis is the strike price minus the premium per share. You now own the stock and can hold, sell, or run a covered call against it.
Is a cash-secured put riskier than buying the stock outright?
Mathematically, no — it is slightly less risky. Your downside is identical to owning the stock outright from the strike price downward, but you start with a premium cushion that reduces your break-even. The trade-off is the upside cap: if the stock rallies 20 percent, you only earn the premium. So the strategy is genuinely lower-risk than direct buying, with a lower ceiling on upside.
Which strike price should I sell?
Pick a strike at or slightly below a price you would have happily placed a buy order at anyway. A common rule of thumb is to sell the strike that is 3 to 7 percent out-of-the-money for a monthly expiry — close enough to collect meaningful premium, far enough to give the stock room to wiggle without assigning you. If the strike is one you wouldn't want to own the stock at, don't sell that put. The strategy only works if you mean every leg of it.
The Honest Take
The cash-secured put isn't magic. It's not an income hack, and it's not a way to escape the basic risk of owning stocks. It's a structured discipline that pays you for the patience of waiting for the right entry price — and gives you the stock at a discount when the wait is rewarded.
The only people who get hurt by this strategy are the ones who fudge the rules — selling puts on stocks they don't actually want, sizing positions they can't fund, or treating "cash-secured" as optional. If you mean every leg of the trade, the strategy will treat you well over time. If you don't, it'll teach you to mean it next time.
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Educational only: This article explains how the strategy works. It is not a stock recommendation, investment advice, or a promise of returns. Options involve real risk, including large losses and delivery obligations.