How to use the VIX

The VIX is the most widely quoted volatility measure in the world, and one of the most misused. Most people think of it as a fear gauge that goes up when markets fall and down when markets rise. That's true but incomplete. For options traders, the VIX is a regime indicator, an entry timing tool, and a positioning signal, all in one number.

What the VIX actually is

The VIX is the CBOE Volatility Index. It measures the 30-day implied volatility of the S&P 500, derived from a weighted basket of SPX options prices across multiple strikes and expirations. It's expressed as an annualized percentage.

A VIX of 20 means the options market is pricing in approximately 20% annualized volatility on the S&P 500. To convert to an expected monthly move, divide by √12: VIX 20 ÷ 3.46 ≈ 5.8% expected monthly move (one standard deviation).

The VIX is not directional. It doesn't tell you whether the market will go up or down, only how much movement is expected.

VIX levels as a regime indicator

The VIX operates in distinct regimes that meaningfully change the options landscape:

The key insight: High VIX means expensive options, but it also means the market is genuinely moving. Selling premium in a VIX-40 environment is not the same as selling in VIX-15. The premium is higher because the risk is higher. VIX level adjusts the opportunity, not the edge.

Using VIX spikes for entry timing

The single most actionable VIX signal for premium sellers is a spike followed by reversion. VIX is mean-reverting, it rises during stress and falls back toward its long-term average (historically around 18–20) as conditions normalize.

The pattern to exploit:

1. VIX spikes sharply, market sells off, fear elevated, put buying drives IV higher
2. VIX peaks and begins to flatten or turn down
3. Options premiums remain elevated but realized volatility starts to normalize
4. Selling options here captures inflated IV that's likely to contract

What to avoid:

• Selling into a rising VIX, you're fighting the trend. IV can keep rising.
• Waiting for VIX to fully revert before selling, by then IV is already cheap again

The ideal entry is when VIX has clearly spiked and shows signs of stabilizing or turning, not before the peak, not long after.

VIX vs individual stock IV rank

The VIX tells you about broad market volatility. It doesn't tell you about individual stock volatility. A stock's IV rank can be low even when the VIX is high, and vice versa.

How to use both together:

High VIX + High individual IV rank: The strongest setup for premium selling. Broad market fear has elevated individual stock options. Double confirmation, both macro and stock-specific IV support selling premium.

High VIX + Low individual IV rank: The market is stressed but this specific stock hasn't repriced much. Less attractive for selling premium on this name, but potentially interesting for buying cheap options if you expect the stock to eventually reprice with the market.

Low VIX + High individual IV rank: Stock-specific event (earnings, product launch, regulatory outcome) is driving elevated IV on this name despite calm markets. Often the cleanest premium-selling opportunity, the elevated IV has a specific, resolvable catalyst.

Low VIX + Low individual IV rank: Options are cheap everywhere. Lean toward buying premium or debit spreads. Income strategies will collect minimal premium.

The VIX term structure

VIX futures trade across different expirations, and the shape of the futures curve tells you about market expectations:

Contango (normal, upward sloping): Near-term VIX futures are cheaper than longer-dated ones. The market is calm and expects volatility to remain normal. This is the default state roughly 75% of the time. Premium sellers generally favor this environment, near-term options are reasonably priced and the macro backdrop is stable.

Backwardation (inverted, downward sloping): Near-term VIX futures are more expensive than longer-dated ones. The market is stressed right now but expects conditions to normalize. This signals peak fear and is often a contrarian signal, some of the best entry points for premium sellers occur when the VIX curve is deeply inverted and begins to normalize.

Practical VIX-based rules

Rule 1, Use VIX as a sizing guide: When VIX is below 15, size premium-selling positions conservatively. The reward is modest. When VIX is above 25, you can justify larger credit spreads and iron condors, but keep individual position sizes smaller due to the higher actual volatility.

Rule 2, Don't fight a rising VIX: If VIX is trending sharply higher day over day, wait before selling premium. A rising VIX means the market is still pricing in more uncertainty, your freshly sold options may immediately reprice against you.

Rule 3, VIX above 30 = consider defined risk only: In crisis VIX environments, undefined risk positions (naked puts, short strangles) carry significantly elevated tail risk. Stick to iron condors, credit spreads, and defined structures until VIX normalizes.

Rule 4, Use VIX reversion after a spike: When VIX has spiked 30–50% above its recent average and begins to flatten, that's often the best 2–4 week window for premium selling of the entire year. These windows (March 2020, October 2022, August 2024) are where systematic premium sellers make disproportionate returns.

Related terms: Implied volatility, IV rank, volatility term structure, VIX futures, contango, vega, credit spread

Try it on Stryke: Monitor how individual stock IV rank moves relative to the VIX using the Options Screener. High IV rank during a VIX spike is your strongest entry signal.