Volatility term structure

Volatility term structure is the curve of at-the-money implied volatility across option expiries, from the nearest expiry to the furthest. Its shape shows whether the options market is paying more for short-dated protection than for long-dated protection. It is a comparison of published quotes, so it can be read without a positioning model.

Senzoukria · Glossary · Updated September 2026

What the curve is made of

Each point on the term structure is one expiry's at-the-money implied volatility, plotted against its days to expiry. The curve therefore compares like with like: the same moneyness, different horizons. It is distinct from the volatility smile, which compares strikes within one expiry, and from skew, which compares the two wings of that smile.

Because the curve is built from published implied volatilities rather than from a pricing model, its inversion can be read without positioning assumptions. Two ATM quotes are compared; nothing about dealer books is inferred.

The shapes and what they usually indicate

  • Contango: the back expiry carries more implied volatility than the front. This is the ordinary state for equity index options, because more time leaves more room for something to happen.
  • Backwardation (inverted): the front expiry is paid above the back. The market is pricing an imminent event or an ongoing stress that is expected to fade with time.
  • Humped: an intermediate expiry sits above both its neighbours, typically around a scheduled event such as an earnings date or a macro release.
  • Flat: no expiry is paid meaningfully above another. Small differences that fit inside the bid-ask of ATM options should not be over-read.

Reading it with skew and gamma exposure

Term structure answers a horizon question; skew answers a direction question. A curve that inverts while put skew steepens describes a market paying for near-term downside protection. Read together with the gamma profile, the picture tells you where hedging pressure might sit and how soon the options that create it will expire. None of this predicts price; it describes what the options market is charging today.

Skew itself has a term structure: short-dated skew reflects the immediate mood while longer-dated skew reflects positioning, as the volatility skew guide sets out.

In Senzoukria

The IV Term Structure panel lives on the Volatility page of the GEX workspace, next to the smile. It plots ATM implied volatility per expiry, labels the shape (contango, inverted, humped or flat) and writes a one-line verdict under the curve with the front-minus-back gap in volatility points. An expiry that returns no usable ATM implied volatility is left out of the curve rather than interpolated; with fewer than two usable expiries the panel says it needs at least two expirations with ATM IV data instead of drawing a shape.

The panel depends on a configured options source; without one the page reports that no chain has come back. Market-data entitlements and fees belong to the options provider and are separate from the software subscription.

Common mistakes

  • Comparing a front expiry that expires today with a back expiry months away and calling the gap a signal; same-day expiries carry event-driven volatility that says little about the curve.
  • Treating a difference smaller than the ATM bid-ask spread as an inversion.
  • Reading the curve as a forecast of realised volatility rather than as the price the market is charging for time.

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Frequently asked questions

What does an inverted volatility term structure mean?
An inverted term structure means the nearest expiry's at-the-money implied volatility is higher than that of later expiries. The options market is paying more for short-dated protection, which usually coincides with an event or a period of stress expected to pass. It is a description of current option prices, not a prediction of the direction price will take.
Is term structure the same as the volatility smile?
No. The smile compares implied volatility across strikes inside one expiry; the term structure compares at-the-money implied volatility across expiries. A trader reads the smile to see which wing is bid and the term structure to see which horizon is bid. Both are built from published implied volatilities and neither requires a dealer-positioning assumption.
Does an inverted term structure require a pricing model?
No. The comparison is between two published implied volatilities, so it holds regardless of which pricing model the rest of a dashboard uses. Gamma exposure, by contrast, is a model output whose levels move when the pricing model or the positioning assumption changes.

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