Volatility Crush After Events
Volatility crush is the sharp decline in implied volatility that occurs immediately after a scheduled macro event — Union Budget, RBI monetary policy, election results — once the uncertainty that inflated options premiums is resolved.
Implied volatility is fundamentally a measure of market uncertainty. Before a major scheduled event, market participants who need protection against large moves buy options aggressively, driving up implied volatility and therefore option premiums across all strikes. This pre-event IV elevation is systematic and predictable enough that experienced traders build strategies specifically around it.
In the Indian context, the three most reliably volatility-inflating events are the Union Budget (presented in February), Reserve Bank of India monetary policy committee (MPC) meetings (six per year), and national election results. Before each of these events, Nifty IV typically rises 20-50% above its trailing 30-day average. In the case of general election result days (May 2019, June 2024), implied volatility on near-expiry Nifty options rose to levels exceeding 30-40 VIX readings, reflecting genuine uncertainty about political outcomes and their policy implications.
The crush happens because once the event is announced — the budget speech is delivered, the RBI governor reads the policy statement, the election commission announces results — the principal source of uncertainty is resolved. Regardless of whether the outcome was positive or negative for the market, the uncertainty itself dissipates. Traders who bought options to hedge or speculate rapidly unwind those positions, and the sudden reduction in option-buying pressure collapses IV within minutes of the event conclusion. An option that was worth Rs 200 on the morning of Budget day might fall to Rs 50 by afternoon even if the underlying index barely moved.
The classic trade structure targeting this phenomenon is known as a short straddle or short strangle entered just before the event announcement, collecting the inflated premium, and closing after the crush. The risk is that the underlying moves so sharply that the delta loss exceeds the vega gain from the IV collapse. In May 2019 and June 2024 elections, the index did move sharply enough to punish short-gamma positions heavily even as IV fell, demonstrating that volatility crush and directional risk are not mutually exclusive.
Measuring pre-event versus post-event IV levels is now standard practice among professional options desks. The India VIX index (published by NSE, derived from Nifty option prices) is the most accessible proxy for this, though it represents 30-day forward IV. Strike-specific IV can be extracted from the chain and provides a more granular picture of the term structure of fear around a given event date.