VIX Futures Term Structure: Contango Drag and Backwardation

Key Takeaways

• VIX futures term structure is the ordered set of VIX futures (ticker VX) prices from front month to ~9 months; the curve is in contango roughly 80 percent of the time since 2010.
• VXX and UVXY roll daily from cheaper near-month to more expensive next-month futures in contango, producing an annualized drag of 30 to 60 percent in sustained calm markets.
• A common mistake: using long-VIX ETPs as buy-and-hold hedges, over months the roll cost in contango exceeds the protection value; short-dated SPX puts are usually more efficient.
• XIV terminated on February 5, 2018 after losing roughly 90 percent in one day when spot VIX roughly doubled, illustrating that short-VIX products have catastrophic left-tail risk.

What It Is

VIX spot is a calculated index, not a tradeable instrument. To trade vol with a forward settlement, Cboe lists VIX futures (ticker root VX), each expiring to the spot VIX value on a specific Wednesday. At any moment there are typically eight or nine listed contract months, from the front month to roughly nine months out.

Plot each contract's settlement price against its expiration date and you get the VIX futures term structure. Upward sloping (later contracts more expensive) is contango. Downward sloping (later contracts cheaper) is backwardation.

The Intuition

Spot VIX is a point-in-time number. It spikes during stress and collapses during calm. Futures settle at a future VIX value, so each futures price reflects the market's best guess of where spot VIX will be at that future date.

Because volatility mean-reverts, when VIX is low the market expects it to drift higher over time, and longer-dated futures are bid above spot. When VIX is extreme, the market expects it to fall, and longer-dated futures trade below spot. The curve shape is a direct readout of where the market thinks volatility is headed relative to now.

How It Works

A typical contango curve might look like this, with spot VIX at 14:

Spot VIX : 14.0
VX front : 15.5
VX +1    : 16.5
VX +2    : 17.2
VX +3    : 17.8
VX +4    : 18.2

Each step higher is roughly 0.5 to 1.0 vol points per month. That slope is the roll cost paid by any long-volatility ETP that continuously buys the back month and sells the front month.

A backwardated curve looks inverted:

Spot VIX : 38.0
VX front : 34.0
VX +1    : 29.0
VX +2    : 25.0
VX +3    : 22.0
VX +4    : 20.5

Front contracts trade above back contracts because near-term fear is priced higher than expected long-run vol. The roll now works in favor of a long-vol holder: the fund buys cheaper back months and sells richer front months.

The roll yield on VIX ETPs in contango is:

Roll yield ~= ( Front month price - Spot VIX ) / Spot VIX

For VXX and similar products, in typical contango that daily drag compounds into an annualized decay of 30 to 60 percent. UVXY, a 1.5x leveraged VIX ETP, has historically decayed roughly 70 to 90 percent per year in sustained contango. These are instruments designed for tactical hedging, not for buy-and-hold exposure.

Worked Example

On October 24, 2008, spot VIX closed around 80 during the peak of the financial crisis. Front-month VIX futures printed roughly 65, the second month roughly 55, and longer-dated futures in the 40s. The curve was steeply backwardated. A holder of VXX over that week earned positive roll yield as expiring front-month contracts fell faster than back-month contracts.

On a typical calm day in mid-2017, spot VIX was near 10, front-month VX near 11, second month near 12, longer-dated contracts near 15. VXX holders were paying about 8 percent per month in roll drag. Over 2017, VXX fell approximately 70 percent despite spot VIX closing the year near its starting level. That divergence is the roll cost in action.

During volatility events (February 2018, March 2020, August 2024), the curve flipped from contango to backwardation within days, sometimes within a single session. Holders of short-VIX products (XIV, SVXY) took catastrophic losses when spot vol spiked and the curve inverted. XIV terminated on February 5, 2018 after losing about 90 percent in one day.

Common Mistakes

1. Treating long-VIX ETPs as hedges for buy-and-hold. VXX and UVXY work as short-term hedges for days or weeks. Held over months, the roll drag in contango costs more than the protection they provide. A put on SPX is usually a cleaner long-dated hedge.

2. Reading spot VIX without the curve. A VIX of 20 with a deeply inverted curve is a market priced for near-term stress. A VIX of 22 in normal contango is a mildly elevated but calm market. The spot level alone misses the structural signal.

3. Ignoring settlement mechanics. VIX futures settle to the Special Opening Quotation (SOQ) of SPX options on Wednesday morning. The SOQ can differ significantly from the VIX value the prior afternoon, producing surprising gaps at expiration.

4. Shorting vol indiscriminately in contango. The expected value of a short-VIX trade in contango is positive on average, but the distribution is heavily left-skewed. A 90 percent win rate can still lose money over decades when the occasional loss wipes out years of accumulated roll yield.

5. Confusing VIX futures with VIX options. VIX options settle on the same date as VIX futures, but their moneyness is defined against the futures price, not spot VIX. Traders who strike against spot consistently misprice the options.

Frequently Asked Questions

Q: What is the VIX futures term structure in simple terms? It is the set of prices for VIX futures across different monthly settlement dates. A curve that rises from front to back (contango) means the market expects volatility to increase from today's level. An inverted curve (backwardation) means the market expects current high volatility to fall.

Q: How does the VIX futures term structure affect investment decisions? The slope of the curve directly determines the roll cost or roll benefit of holding VIX-linked ETPs. In steep contango, VXX holders pay 30 to 60 percent annually in roll drag. In backwardation, the roll works in their favor. Knowing the curve shape before buying any VIX ETP is essential.

Q: What is a real-world example of VIX futures term structure impact? In 2017, spot VIX near 10, front-month VX near 11, longer-dated contracts near 15. VXX fell approximately 70% during the year even though spot VIX ended near where it started. That loss came entirely from daily roll cost in contango, not from a collapse in realized volatility.

Q: How can investors use the term structure signal practically? Check the VIX futures curve daily. A steep contango (slope above 1 vol point per month) warns against holding long-VIX products. VIX/VIX3M above 1.0 in backwardation signals near-term fear and has historically coincided with above-average 3-month forward SPX returns.

Q: How are VIX futures different from VIX options? VIX futures settle to the Special Opening Quotation (SOQ) of SPX options on Wednesday morning. VIX options are priced off the VIX futures price at expiration, not spot VIX. Striking VIX options against spot VIX instead of the appropriate futures price is a common and costly error.

Sources

1. Cboe. "VIX Futures Specifications." https://www.cboe.com/tradable_products/vix/vix_futures/specifications/
2. Cboe. "VIX Term Structure." https://www.cboe.com/tradable-products/vix/term-structure/
3. Macroption. "VIX Futures Curve." https://www.macroption.com/vix-futures-curve/
4. Sinclair, E. Volatility Trading (2nd ed., 2013). Wiley. https://www.wiley.com/en-us/Volatility+Trading%2C+2nd+Edition-p-9781118347133

Disclaimer

This article is educational content only and is not financial advice. Nothing here is a recommendation to buy, sell, or hold any security. Consult a licensed advisor before making investment decisions.