The rules at a glance
- The idea: sell options that are likely to expire worthless and keep the premium; the time decay works for you, the big moves against you
- Strikes: out of the money, far enough that the Nifty needs a bigger-than-usual move to reach them (in the example 400 points, about 1.6%: roughly one standard deviation over six days at 12% volatility)
- Position size: work out the loss at your stop, and at a 4% gap, before you sell; one lot of Nifty is 65 units
- Exit: buy back if the premium doubles (stop), or once most of it has decayed; never hold a losing short option hoping
- Avoid: selling into big events (RBI policy, the budget, major global data) unless that's the plan, and naked selling without a stop
How option sellers make money
An option buyer pays a premium for the right to profit from a move. The seller takes that premium and the obligation that comes with it. If the move doesn't come, the option expires worthless and the seller keeps the whole premium. If it does, the seller pays the difference, and that can be far more than the premium collected.
Most out-of-the-money options do expire worthless, so sellers win often. But the wins are small and capped at the premium, while a single big move can wipe out weeks of them. That trade-off, many small gains and occasional large losses, is what option selling comes down to. Every rule below is about surviving the large losses.
Time decay: the seller's edge
An option's price is part intrinsic value (how far it is in the money) and part time value. Time value shrinks as expiry gets closer, and it shrinks fastest in the last few days. This is theta, and it's what sellers are paid for. Here is the model price of a 24,600 put with the Nifty staying at 25,000 and volatility unchanged:
| Days to expiry | 24,600 PE premium (model) | Value of one lot |
|---|---|---|
| 6 | 25.55 | ₹1,661 |
| 4 | 13.10 | ₹852 |
| 2 | 2.75 | ₹179 |
| 1 | 0.25 | ₹16 |
The decay looks like free money in a table like this. In practice it only works if the Nifty stays away from the strike. A fall towards 24,600 makes the put more expensive every day, not cheaper.
Choosing the strike
- Distance. The further out of the money, the more likely the option expires worthless, and the less premium you get. A strike 400 points (about 1.6%) away gave about 25 points of premium in the example; one 200 points away gave about 66.
- Delta. Option chains show each option's delta, roughly how much its price moves for a 1-point move in the Nifty. Many sellers use it as a rough guide to distance: the 24,600 put in the example has a model delta of about −0.13.
- Volatility. When volatility (shown as India VIX for the Nifty) is high, premiums are richer, because bigger moves are expected. Selling is better paid then, and also riskier.
- Events. Election results and budgets have moved the Nifty several percent in a day (it fell about 5.9% on 4 June 2024, election results day); RBI policy days usually move it less but can surprise. Premiums before them are high for a reason.
Worked example: selling a Nifty put
Profit or loss at expiry
With the Nifty at 25,000, sell one lot of the 24,600 put for 25.55. That's ₹1,661 received. If the Nifty finishes above 24,600 on expiry day, the put expires worthless and that's the profit.
| Short 24,600 PE, 1 lot | |
|---|---|
| Net premium | ₹1,661 received |
| Maximum profit at expiry | ₹1,661 |
| Maximum loss at expiry | ₹15,97,339 in theory (if the Nifty fell to zero) |
| Breakeven at expiry | 24,574.45 |
| If the Nifty falls 2% to 24,500 | −₹4,839 |
| If the Nifty falls 4% to 24,000 | −₹37,339 |
| Stop: buy back if the premium doubles | exit at about 51.10, a loss of about ₹1,661 plus slippage |
| STT on the sale (0.15% of the premium) | ₹2 |
Compare the best case with the 4% row. The best case is ₹1,661. A 4% fall, which the Nifty has done in a single day several times in its history, costs over ₹37,000. The stop, buying the put back if its premium doubles, keeps a normal bad week to roughly the size of one win. It doesn't protect you from a gap at the open, when the premium can jump far past your stop before you can act. That's why many sellers buy a further out-of-the-money option as a hedge, which turns the trade into a credit spread with a fixed maximum loss.
Common option selling strategies
| Strategy | What you sell | Maximum loss | Guide |
|---|---|---|---|
| Short put or call | One out-of-the-money option | Large (unlimited on a call) | This page |
| Short strangle | An out-of-the-money call and put | Unlimited | Short strangle |
| Short straddle | The at-the-money call and put | Unlimited | Straddle |
| Iron condor | A strangle with protective options bought further out | Capped | Iron condor |
| Credit spread | One option, with a further one bought as protection | Capped | Bull put and bear call spreads |
Margin and costs
- Margin. Selling a naked Nifty option blocks a large margin, set daily by the exchange (SPAN plus exposure margin), and more on expiry day. Buying a protective option cuts it sharply. Check the exact figure in your broker's margin calculator.
- STT. 0.15% of the premium on every option you sell, since 1 April 2026, and 0.15% of the intrinsic value if an option you hold is exercised at expiry.
- Other charges. Brokerage, exchange charges, SEBI fees, GST and stamp duty. On small premiums they're a real share of the profit.
Rules that keep sellers in the game
- Size for the bad day, not the average day. Ask what a 4% gap would cost, and make sure you could take it.
- Set the stop when you sell. A common rule is to buy back if the premium doubles.
- Take profits early. Many sellers buy back once 70–80% of the premium has decayed, rather than holding the last few rupees into expiry day.
- Prefer hedged positions. A protective option costs a little premium and caps the worst case.
- Don't add to losers. Selling more as the Nifty moves against you turns a bad week into a disaster.
How to test it before you trade it
TradingView's Strategy Tester works on one chart at a time, so it can't test a multi-leg option strategy that sells new strikes every week. Testing an option strategy works differently from the chart strategies on this site.
- Check the shape with today's prices. Put the live premiums into the payoff calculator and note the breakevens, the maximum loss and the result if the Nifty moves 2% or 4%.
- Check the margin. Use your broker's margin calculator for the whole position. Hedged positions need much less than naked ones.
- Backtest on past option prices. Some Indian platforms, such as AlgoTest, let you test option strategies on historical Nifty option data. Include costs and slippage.
- Paper trade it first. Sell on paper for at least a few months of weekly expiries, including at least one sharp move, and note what your stop actually filled at.
- Keep a journal. Write down the entry, the exit, the reason and the result for every trade. A trading journal shows quickly whether your exits follow your rules.
With one trade per weekly expiry, 100 trades take about two years. Judge a selling strategy on a long sample: it can win for months and then give much of it back in one bad week.
Try it in the payoff calculator, and get the PDF
Open the short put in the free payoff calculator with these legs filled in, then type in today's premiums from your option chain to see the real breakevens and maximum loss. The PDF is a one-page cheat sheet with the rules, the payoff diagram and a checklist.
Nifty options and the rules in India
Nifty options trade on NSE and are legal for residents through a SEBI-registered broker. SEBI tightened the rules for index derivatives in stages: from 20 November 2024, weekly options on only one benchmark index per exchange, a minimum contract value of ₹15 lakh and an extra 2% extreme loss margin on short options on expiry day; from 1 February 2025, option premiums collected upfront. Since 1 April 2026, STT on options sold is 0.15% of the premium. Check your broker's current margin and charges before you trade.
The odds are worth knowing. SEBI found that 93% of individual traders in equity futures and options lost money over FY22 to FY24, and 91% did in FY25. Nothing on this page is advice about what the Nifty will do; it explains how the strategy works and what it risks.
Related strategies: short strangle, straddle, iron condor, bull put and bear call spreads, opening range breakout, VWAP pullback. Build any of them in the payoff calculator. All 34 strategies are compared on one page on the trading strategies page.