The Option Premium is the upfront price the option buyer pays to the seller (writer) to obtain the contractual right. It has two components: intrinsic value (how much the option is already in-the-money) and time value (the optionality of moves before expiry).
Plain-English example
HDFCBANK spot = ₹1,650. The 1,700 Call expiring in 30 days trades at ₹28. Intrinsic value = max(1,650 − 1,700, 0) = 0. Time value = ₹28 − 0 = ₹28. The entire premium is time value. If 20 days pass and HDFCBANK is still at ₹1,650, the same call may decay to ₹8 even though spot is unchanged — that's theta at work.
What drives premium
- Spot vs strike distance (intrinsic value)
- Time to expiry (more time = more premium)
- Implied Volatility (higher IV = higher premium)
- Risk-free rate (small effect)
- Dividends expected before expiry
When it matters
Premium = max loss for a buyer, max gain for a seller. Comparing premium to potential payoff = expected-value check.
SEBI caveat
Options premium movement is non-linear (gamma, vega). Past premium behaviour is not predictive. Educational only.