Why does a leveraged ETF lose over time?Needs one idea

Because it promises twice the daily move, and twice the daily move compounded is not twice the move over a year. The gap is arithmetic, not a fee.

3 min read · 491 words

Because of what it actually promises. A leveraged product almost always promises twice — or three times — the move of its index over one day. It does not promise twice the move over a month, and over any period longer than a day the two are different numbers.

The arithmetic, once

Take an index at 100 that rises 10% and then falls back to exactly where it started. To return to 100 from 110, it has to fall by 10 ÷ 110, which is about 9.09%. The index is flat over the two days.

A 2x product does this instead:

• Day one: +20%. From 100 to 120.
• Day two: twice −9.09%, so −18.18%. From 120 to 120 × 0.8182 = 98.18.

The index is unchanged. The 2x product is down about 1.8%. No fee has been charged in this example and nothing has gone wrong.

Why it happens at all

Because the product resets. To deliver twice the next day's move, it has to hold twice the current value in exposure — so after a good day it buys more, and after a bad day it sells. Buying after a rise and selling after a fall is the pattern that loses money in a market that goes both ways, and it is not a mistake: it is the only way to keep the daily promise.

The effect has a name — volatility drag — and it grows with two things: how far the index swings, and how long you hold. In a market that trends steadily in one direction, the same resetting works the other way and a 2x product can beat 2x. Both outcomes come from the same mechanism.

What this is not

• It is not a hidden fee. There are fees, and financing costs on the borrowed exposure, and they matter — but the gap above appears with neither.
• It is not a flaw in the product. The daily promise is stated plainly in the documents. It is being read as a longer promise that causes the surprise.
• It is not specific to ETFs. Any instrument that resets a leverage ratio on a schedule has the same shape, including many leveraged notes and constant-leverage certificates.

How to read the documents

Look for the reset period. "Daily" is the common one; some products reset monthly, which reduces the effect and changes the exposure you actually hold intraday. Look for whether the leverage is on price or on total return, and look for the financing rate, because the borrowed part is borrowed at a real rate.

The fund factsheet playbook is about reading these documents in general; leverage is the mechanism underneath.

The one-line version

A daily 2x product does exactly what it says every day, and the compounding of those days is not the same as 2x of the period. The rougher the ride, the bigger the difference — and the difference is not a charge anybody made.