The Relationship Between the VIX and 0DTE Options

What is the VIX?

The Cboe Volatility Index (VIX) is known as the market’s “fear gauge.” It represents the market’s expectation of 30-day forward-looking volatility, calculated using the implied volatility of S&P 500 (SPX) options.

When the VIX is high, options premiums across the board are generally more expensive because market makers are pricing in larger expected moves.

Why the VIX Misses 0DTE Volatility

The most common misconception among new 0DTE traders is that watching the VIX will tell them how 0DTE options are priced today. This is false.

The VIX is strictly a 30-day calculation. It uses SPX options expiring between 23 and 37 days out. It completely ignores 0DTE options.

This creates a structural disconnect:

• The S&P 500 can experience a massive intraday swing (high 0DTE volatility).
• But if the market believes the turmoil will resolve within a few days, the VIX (30-day volatility) might barely move.

The VIX1D (1-Day VIX)

To address this gap, Cboe launched the VIX1D in 2023. The VIX1D specifically measures the expected volatility of the S&P 500 over the current trading day using 0DTE and 1DTE options.

If you are trading 0DTE options, the VIX1D is a far more accurate representation of the premiums you are paying or receiving than the traditional 30-day VIX.

How Baseline VIX Impacts 0DTE Premiums

Even though the VIX measures 30 days out, a high baseline VIX environment still lifts the floor for 0DTE premiums.

• Low VIX Environment (VIX < 15): 0DTE options are relatively cheap. An At-The-Money (ATM) straddle might price in a 0.4% daily move.
• High VIX Environment (VIX > 25): 0DTE options are expensive. An ATM straddle might price in a 1.2% daily move.

Practical Application

If the VIX is highly elevated (e.g., during a geopolitical crisis), buying 0DTE options becomes extremely difficult because the break-even points are pushed far away from the current price. You need an exceptionally large intraday move just to overcome the initial premium cost. Conversely, selling 0DTE premium can be lucrative, provided you can manage the massive intraday tail risks that caused the VIX to spike in the first place.