USO’s Hidden Math: Why Oil’s 73% Gain Became Your 22% Return

If you bought United States Oil Fund (NYSEARCA:USO) a decade ago because you thought oil was cheap, the spot price proved you right, but the fund did not. Spot West Texas Intermediate crude has climbed from $48.76 per barrel in June 2016 to roughly $84.65 by mid-June 2026. USO, supposedly your way to ride that move, returned 22.01% over the same 10-year window. The barrel went up, but your wrapper bled.

What you’re actually paying

The headline fee is the smallest piece of this. USO’s published expense ratio sits in the neighborhood of 60 basis points, which translates to roughly $60 a year per $10,000 invested. Over 20 years, that fee compounds into more than $1,000 per $10,000 stake before you account for anything else.

The real bill is the structural one. USO holds short-dated WTI futures and rolls them forward every month. When the futures curve is in contango (a four-word gloss: later contracts cost more), the fund sells the cheap expiring contract and buys the more expensive next one. That gap is a recurring loss baked into the strategy, invisible on any factsheet. The 10-year gap between spot WTI’s climb and USO’s 22.01% total return is roll decay doing its quiet work month after month.

The part the factsheet doesn’t highlight

USO is structured as a commodity pool limited partnership, which means investors receive a Schedule K-1 each tax season rather than the 1099 most ETFs send. K-1s arrive late, complicate filings, and can generate Unrelated Business Taxable Income inside an IRA. That is a soft cost few buyers price in until April.

Then there’s the tracking divergence you cannot see in a one-week chart. USO is down 21.04% over the past month as oil retreated from its spring high. The fund is up 60.89% year-to-date, riding WTI’s surge from $60.04 in January 2026 to $102.13 by May 2026. Holders who timed it nailed the rally. Holders who bought and waited got a different fund than they thought they did. Over the trailing five years, USO returned 123.25% while WTI spot traveled from $71.38 in June 2021 to today’s $84.65. The number works on short bursts of backwardation. It punishes you the rest of the time.

The cheaper mirror

If the goal is crude exposure with less roll bleed, the United States 12 Month Oil Fund (NYSEARCA:USL) spreads holdings across the next 12 futures contracts, softening the contango hit. The United States Brent Oil Fund (NYSEARCA:BNO) does the same for the international benchmark. If equity exposure works for your thesis, the Energy Select Sector SPDR Fund (NYSEARCA:XLE) and the SPDR S&P Oil & Gas Exploration & Production ETF (NYSEARCA:XOP) give you producers whose cash flows rise with crude, no rolling required, plus 1099 tax reporting and dividends. None tracks spot oil perfectly. Each one sidesteps the specific mechanism that has cost USO holders the most.

What this means for you

USO is a tactical instrument that markets itself as a strategic one. The fund delivers what its prospectus promises: exposure to a basket of front-month WTI futures. That is a different product than “oil.” Before you hold it past a few weeks, the question to ask is whether you are paying to bet on the price of crude, or paying to rent a futures-rolling machine whose decay is built into the design.