Volatility Decay: Why Leveraged ETFs Lose Ground in Choppy Markets

Start with an index at 100. It gains 5% on Monday and closes at 105, then loses 5% on Tuesday and closes at 99.75. Over two days the index is down a quarter of a percent. Now run the same two days through a fund that promises twice the daily move.

Why the fund falls further

The fund resets every day. It delivers twice Monday’s move on Monday’s starting value, then twice Tuesday’s move on Tuesday’s starting value, which is a larger number after a good day. A 10% loss taken from 110 removes 11 points. The 10% gain took the fund from 100 and added only 10.

That asymmetry is the whole effect. Any series of ups and downs that nets to roughly flat leaves a daily-reset fund below where a simple multiple of the index return would put it, because losses land on bigger bases and gains on smaller ones, and leverage exaggerates both halves of that swing. Inverse funds suffer the same way. A -1x fund on those two days goes 100 to 95 to 99.75. A -2x fund goes 100 to 90 to 99.

What makes it bigger or smaller

These set the size of the drag:

• Leverage.
• Volatility.
• The shape of the path.

Push leverage to 3x on the same two days and the fund goes 100 to 115, then loses 15% to 97.75. That’s a 2.25% loss, nine times the index. The drag grows faster than the leverage does.

Bigger daily swings make it worse too, since the gap between the base a gain lands on and the base a loss lands on widens with the size of each move, so two days of plus and minus 1% barely leave a mark while two days of plus and minus 10% leave a large one.

Steady one-way markets shrink the drag and can flip it. If the index gains 5% on both days it reaches 110.25, up 10.25%, and the 2x fund reaches 121, up 21%, which is more than double. Compounding is the same mechanism in both cases; it just pays you when the path is smooth and charges you when it zigzags. Try your own paths in the leveraged ETF decay calculator.

Where it shows on the fund fact sheet

A fact sheet won’t print a line called volatility decay. Look for the fund’s objective instead, usually one sentence near the top: the fund seeks daily investment results, before fees and expenses, of a stated multiple of the daily performance of its index. The word “daily” carries the warning.

The prospectus says more. It normally has a section explaining that returns over periods longer than one day can differ from the stated multiple, often with a table of hypothetical index returns and volatilities. Read that table. It’s the fund sponsor showing you the same arithmetic as the working above.

What people get wrong

The common mistake is reading a 2x fund as a 2x position you can hold for months. It’s a one-day instrument, and anyone holding it for longer than a day owns a string of one-day bets whose result depends on the order of the moves as much as on where the index ends.

A second mistake is blaming fees. Leveraged funds do charge more than plain index funds, and that shows up too, but the four-to-one gap in the example comes entirely from the path. A third is assuming decay only hits inverse funds. It hits any fund with a daily multiple other than one.

Traders who use these funds well treat them as short swing tools. They set a holding period in days, check the fund against the index each close, and exit when the index starts chopping sideways. The reasoning behind that is set out in inverse ETFs reset daily, and the inverse ETF list says how each listed fund is built.

Related terms

Beta slippage and compounding drift are other names for the same drag. Tracking error measures how far any fund strays from its index over time, and for a leveraged fund most of that stray comes from the reset. Daily rebalancing is the fund’s end-of-day trade that restores its leverage ratio, and it is the step that creates the drag in the first place. More on how funds follow an index sits under ETFs and in tracking error.