- Option buyer: pays a premium, risk is limited to that premium, needs a big move quickly.
- Option seller (writer): collects the premium, needs much more margin, and can lose far more than the premium if the market moves sharply.
- Time decay (theta) helps the seller and hurts the buyer every day.
How an option buyer makes money
When you buy a call, you pay a premium for the right to profit if the index rises above the strike. When you buy a put, you profit if it falls below the strike. Your maximum loss is the premium you paid. The catch: the move has to be large enough and fast enough to beat time decay. If the market stays flat, the premium slowly melts.
How an option seller makes money
The seller is on the other side. They receive the premium up front and keep it if the option expires worthless. Because time decay works for them, sellers can make money when the market goes nowhere. But if the market moves sharply against a short option, the loss is not capped at the premium. A short call can keep losing as the market rises; a short put can keep losing as it falls.
Side by side
| Option buyer | Option seller | |
|---|---|---|
| Pays or receives | Pays premium | Receives premium |
| Maximum loss | Premium paid | Can be many times the premium |
| Maximum profit | Large if the move is big | Limited to the premium received |
| Capital needed | Only the premium | Exchange margin, usually far larger |
| Time decay | Works against you | Works for you |
| Wins when | Big, fast move in your direction | Market stays in a range or moves slowly |
| Typical pain | Many small losses | Rare but very large losses |
The Greeks that matter most
- Delta: how much the option price moves for a 1-point move in the index. At-the-money options are around 0.5.
- Theta: how much value the option loses per day from time decay. It speeds up near expiry.
- Vega: how sensitive the premium is to volatility. Premiums often fall after big events (results, budget) even if the index moves, because volatility drops.
- Gamma: how fast delta changes. It is highest for at-the-money options close to expiry, which is why expiry-day premiums swing so wildly.
Common mistakes on each side
Buyers
- Buying far out-of-the-money options because they look cheap.
- Holding through flat markets while theta eats the premium.
- Ignoring volatility: buying expensive options just before an event, then losing even when right on direction.
Sellers
- Selling naked options without a stop-loss or a hedge.
- Using all available margin, leaving no room for a sudden gap.
- Thinking a high win rate means low risk. One bad day can erase months of small gains.
Where to start
- Understand support and resistance before trading options at all.
- Learn how expiry and theta work on the Nifty weekly expiry page.
- Fix your maximum loss per trade with position sizing.
- If you sell options, learn defined-risk spreads, where a bought option caps your loss, before you ever sell naked.
For education only. This is not investment advice or a recommendation to buy or sell any security. Abhimanyu Traders is not a SEBI-registered investment adviser. Trading in equities and derivatives involves risk of loss.