Reading the VIX Term Structure for Volatility Trades

The VIX measures the implied volatility of 30-day S&P 500 options. The VIX futures curve — contracts at different maturities — reveals the market's expectation of volatility over time and is one of the most persistently exploitable structures in listed derivatives markets.

The Term Structure Explained

Under normal market conditions, VIX futures trade in contango: the near-term contract is cheaper than longer-dated contracts, reflecting the expectation that short-term conditions will normalise. During periods of acute stress, the curve inverts into backwardation — spot VIX trades above futures — as the market prices in an immediate risk premium that it expects to decay. The spread between the front-month and second-month VIX futures contract is the primary input for volatility carry trades. When this spread is wide and the curve is steeply contango, the roll yield from selling front-month and rolling to the next contract is substantial.

Contango Decay as a Trade

The persistent contango structure creates a mechanical headwind for long volatility products. VIX ETPs such as VXX must continuously roll from expiring front-month futures into second-month futures, paying the contango spread each month. In a stable, low-volatility environment, this roll cost compounds to 15 to 25% annually. Short volatility strategies that systematically sell front-month VIX futures and buy them back before expiry capture this spread. The trade performs consistently in low-volatility regimes and suffers severely during volatility spikes — the February 2018 VIX spike destroyed several inverse VIX products in a single session, underscoring that the position requires strict risk management and position sizing relative to portfolio volatility.

Event Volatility and Term Structure Distortion

Scheduled macro events — Federal Reserve meetings, non-farm payrolls releases, elections — inflate implied volatility for the options expiry bracketing the event date. This creates a kink in the term structure that is visible weeks in advance. Buying options spanning the event date and selling options on either side captures the event volatility premium if the implied move underestimates the realised move. The inverse — selling event volatility — is profitable in the more common scenario where the market overprices expected moves. Fed meetings, historically, have resolved with less equity market movement than the options market implied approximately 60 to 65% of the time since 2010.