What is Time Decay (Theta) in Options? – Explained with Simple Examples
Time Decay, also known as Theta, is one of the most important concepts in option trading. It affects the value of your options every single day — even if the market doesn’t move! Let’s understand it in the easiest way possible. πΉ What is Time Decay? Time Decay means that as the option gets closer to its expiry date, the premium (price) of the option reduces — even if the market stays flat. This happens because options are wasting assets. They lose value over time. π Example: You bought a Nifty 22,800 CE at ₹100 — with 7 days to expiry. Let’s say Nifty stays flat at 22,800: Days Left Option Premium 7 days ₹100 5 days ₹80 3 days ₹55 1 day ₹25 ✅ Even without movement, the premium drops due to time decay! π What is Theta? Theta is a Greek value that tells you how much premium will reduce daily. Example: If Theta = -5 → Option will lose ₹5/day (if market stays flat) π§ Why It Matters: If you're buying options, time decay works against you If you're selling options, time decay wo...