VIX Term Structure Explained: Contango and Backwardation

The VIX futures term structure is a snapshot of prices for different futures maturities. It helps explain why two volatility positions can respond differently to the same news. Read it as a set of market prices today, not a guaranteed path that volatility will follow.

Put maturity on the horizontal axis

Plot each futures price against its expiration date, using quotes from the same time. Spot VIX can be displayed alongside the curve for context, but it is not another futures maturity. A future settling next month concerns the 30-day volatility measure at that future settlement date; it is not simply today's VIX averaged until then.

Contango slopes upward; backwardation slopes downward

In the first row, later futures cost more than nearer ones. In the second, nearer futures cost more. Curves can also be flat or have a hump around a particular event. Calling the entire curve “in contango” can hide a backwardated pair of nearby contracts.

In the contango example, the next-minus-near spread is 20 − 18 = 2 points. Relative to the near contract, that is 2 ÷ 18 = 11.11%. This is a comparison between two prices, not a promised monthly loss, annualized yield or probability.

Why the curve changes

A near-term shock can lift nearby futures more than later contracts if market participants expect the disturbance to fade. A known event farther away can instead make one later maturity relatively expensive. Volatility risk compensation and demand for protection also influence the curve. An upward slope is not proof that realized volatility must rise, and backwardation is not a stand-alone signal to sell stocks.

Rolling exposure is different from holding one contract

A rolling strategy closes exposure in an approaching maturity and opens exposure farther out. In the 18/20 example, it replaces a cheaper near contract with a more expensive next contract. That description alone does not mean an immediate two-point cash loss occurs at the instant of the roll: futures are margined contracts, and the result depends on subsequent price changes and the strategy's weighting rules.

To isolate the price effect, suppose the newly purchased future at 20 later falls to 18 as it approaches settlement, while spot VIX remains at 16. A standard long VX contract loses (18 − 20) × $1,000 = $2,000 before costs. This illustrates how a long futures position can lose despite unchanged spot VIX. The assumed futures decline is a scenario, not a necessary consequence of today's curve.

Conversely, a contract bought at 27 that later rises to 30 gains $3,000 before costs. Backwardation can support such convergence, but a drop in the whole curve can overwhelm it. Neither shape guarantees a profitable trade.

How this affects ETFs and options

A futures-based volatility ETF follows its benchmark's rolling schedule; its result combines changes in its futures exposure, expenses and other tracking effects. Persistent contango can create a difficult environment for long rolling exposure. Use the fund's prospectus to identify the contracts and weights instead of estimating its return from a single spot quote.

For VIX options, compare the option expiration with the relevant forward volatility horizon. A distant call need not respond strongly to a short-lived jump in today's index. The curve is useful context, but it is not a complete option-pricing model.

A practical reading sequence

1. Check the quote timestamp and actual contract dates.
2. Compare adjacent maturities rather than relying only on spot VIX.
3. Identify unusual event-related humps or gaps.
4. Map the futures or option position to its own horizon.
5. Evaluate several curve changes, including a broad decline and a sudden spike.

Continue with VIX, futures and ETF differences to connect the curve to specific product types.