The Impact of Event-Driven Volatility on Intraday Option Trading

Intraday option traders must stay alert to not just technical patterns but also to event-driven volatility, which can dramatically distort price behavior within minutes. Events like RBI policy announcements, US inflation data, corporate earnings, or geopolitical updates can trigger rapid surges in implied volatility (IV) and create sharp but short-lived movements in both index and option premiums. Let’s understand how this works. Ahead of a scheduled event (say, an RBI rate decision at 10 AM), market participants start building positions based on expectations. IVs typically rise in the options chain because there’s uncertainty around the outcome. This causes premiums to inflate — not necessarily because the underlying has moved yet, but because market-makers anticipate movement and price in the risk. Now, here’s where intraday opportunity — and risk — comes in. Suppose you’re trading Bank Nifty and notice that both call and put premiums are rising ahead of the announcement. If you buy options here, you're paying for the volatility. Once the event passes, even if the underlying moves, premiums might drop if the actual move is less volatile than expected. This is known as IV crush — and it can destroy even well-placed trades. Many intraday traders make the mistake of holding long straddles or directional positions into events, expecting a breakout. But if the move doesn’t exceed the “priced-in” volatility, both sides of your position can lose value. On the other hand, if you’re aware of the volatility behavior, you could trade smarter. For example, you might wait for the announcement, observe the first candle reaction, and then trade the momentum that follows once volatility stabilizes. There’s also the flip side: sometimes, an unexpected event hits during market hours — a political resignation, an overnight global market crash, or sudden news on crude or USD-INR.