The difference in one paragraph
A spot bitcoin ETF buys bitcoin, gives it to a qualified custodian, and holds it. Nothing expires, nothing needs replacing, and the fund's job is to sit still while the coin does whatever it does. A futures bitcoin ETF buys cash-settled CME contracts referencing bitcoin and parks the rest of its money in Treasury bills. Those contracts expire on fixed dates, so the manager has to sell each one and buy a later-dated one before it does — forever. When deferred contracts cost more than near ones, which for bitcoin has been the normal state of affairs, that replacement is a recurring loss. Add it to an expense ratio four to six times higher than a spot fund's and you have the entire commercial history of the category.
Where the fund lists are
This page is the conceptual comparison. If you want the rosters — tickers, fees, assets and custodians — they live on the US spot Bitcoin ETF list and the bitcoin futures ETF list.
What each fund owns
Open the holdings page of a spot fund and there is one line: bitcoin, a coin count, a custodian. That is the entire portfolio. The fund's operational complexity sits in creation and redemption — how authorised participants deliver cash or coin in exchange for baskets of shares — rather than in anything the portfolio does day to day. We cover that plumbing in how bitcoin ETFs work.
Open a futures fund's holdings page and there is no bitcoin anywhere. There are Treasury bills, a cash or money-market position, and a handful of futures contracts with expiry months printed beside them. Some funds add swap agreements. ProShares' BITO holds CME contracts and Coinbase-listed futures as well as swaps, and routes part of that exposure through a wholly owned Cayman Islands subsidiary — a standard device that keeps a 1940 Act fund inside its own qualifying-income rules while taking commodity exposure.
This is not a technicality. It changes what you are exposed to. A spot holder carries bitcoin price risk plus custody risk. A futures holder carries bitcoin price risk, plus basis risk between the contract and the coin, plus roll cost, plus counterparty exposure on any swaps, plus whatever the collateral portfolio does. More moving parts, each with its own way of failing to do what you wanted.
How closely each one tracks bitcoin
A spot fund's tracking error comes almost entirely from its fee, which is deducted daily, and from small frictions around creation and redemption. In practice the large US funds have run tracking differences in the region of a few basis points a year, and the number is boringly predictable because there is nothing in the structure to make it surprising.
A futures fund's tracking difference is a different quantity altogether, because roll cost does not appear in any headline figure. The fee is printed on the fact sheet. The roll is not. It surfaces only after the fact, as a gap between the fund's total return and the bitcoin price, and its size depends on the shape of the CME curve during your particular holding period rather than on anything the sponsor controls. That is why we argue on the futures fund page that these products should be judged on multi-year total return against spot, never on their expense ratio.
The mistake we see most often
People compare the two wrappers on the expense ratio alone, decide the gap is "only" 70 basis points, and conclude it hardly matters. It is the wrong comparison twice over. The fee gap is closer to 70 to 110 basis points depending on which funds you pick, and the roll cost sits on top of it, unquoted. Then both compound. If you intend to hold bitcoin exposure for five or ten years — which is the only holding period that makes sense for an asset this volatile — the divergence between a 0.20% spot fund and a 0.95% futures fund carrying roll drag is not a rounding error. It is a meaningful fraction of the position.
What each one costs
Here the numbers do the arguing. US spot bitcoin ETFs charge between 0.14% and 0.25% at the competitive end of the market, with one legacy outlier at 1.50%. The surviving futures funds charge 0.88% to 1.27%, and then pay roll costs the investor never sees itemised. The fee page works through what those numbers mean in dollars.
The comparison that matters
| What differs | Spot bitcoin ETF | Futures bitcoin ETF |
|---|---|---|
| What the fund holds | Bitcoin, with a qualified custodian | Dated CME contracts, swaps and Treasury bills |
| Typical expense ratio | 0.14% – 0.25% | 0.88% – 1.27% |
| Roll cost | None — nothing expires | Recurring, unquoted, worst in contango |
| Registered under | Securities Act of 1933 (grantor trust) | Investment Company Act of 1940 |
| Independent board | No — a sponsor, not a board | Yes, with statutory duties |
| First US launch | 11 January 2024 | 18 October 2021 |
A third option neither wrapper offersBoth of these funds stop at exposure. Neither lets you withdraw a coin, move it, or hold it outside market hours. An exchange account does all three, and charges a trading fee once rather than a percentage every year.
Buy cryptoWhy futures were approved first
The order of approval looks backwards until you understand what the SEC was actually worried about. It was never the ETF wrapper. It was the market underneath it.
A bitcoin futures ETF references contracts traded on the CME — a designated contract market regulated by the CFTC, with position limits, a documented surveillance regime and information-sharing arrangements the Commission was willing to rely on. Spot bitcoin, by contrast, trades on venues the SEC did not consider to be regulated markets of significant size with adequate surveillance sharing. On that basis it approved BITO in October 2021 while continuing to reject spot applications on market-manipulation grounds, year after year. Our regulation guide tracks the full sequence of filings.
Grayscale challenged that reasoning directly. In Grayscale Investments v. SEC, 82 F.4th 1239, decided by the DC Circuit on 29 August 2023, the court held that the Commission had failed to explain why a spot product was materially different from the futures products it had already approved. Both, the court observed, depend on the same underlying bitcoin price and the same CME surveillance. Denying one while permitting the other, without a coherent account of the difference, was arbitrary and capricious, and the denial was vacated.
It is worth being precise about what that ruling did and did not do, because it is routinely overstated. It did not compel the SEC to approve anything. It removed the reasoning the Commission had been relying on and sent the matter back. The Commission could in principle have constructed a new rationale. It did not, and on 10 January 2024 it issued Release No. 34-99306, approving eleven spot bitcoin products at once. They began trading the following morning.
How the door opened The commercial consequence arrived faster than the legal one had. VanEck closed its futures fund XBTF within three weeks of the approval order, immediately after its own spot fund began trading. Hashdex converted its futures fund to spot in March 2024 rather than compete against the new products. The category did not decline gradually — it was made obsolete on a specific date, and the sponsors who moved fastest were the ones who accepted that first.
Two different acts, two different rulebooks
This is the part where the futures funds have a genuine and often-overlooked advantage, and it deserves to be stated fairly rather than waved away.
US spot bitcoin ETFs are not registered investment companies. They are grantor trusts registered under the Securities Act of 1933, holding a commodity, and the protections of the Investment Company Act of 1940 simply do not apply to them. There is no board of directors with fiduciary duties to shareholders. There is a sponsor, a trustee and a custodian, governed by a trust agreement. That structure is well understood — it is the same one used by gold trusts for two decades — but it is not what most investors picture when they hear the word "ETF". We take the distinction apart in what a bitcoin ETF actually is.
BITO is a 1940 Act registered investment company, and that brings a specific enforceable package: an independent board majority, statutory limits on leverage and on affiliate transactions, prescribed custody arrangements for fund assets, and diversification and reporting requirements. It cannot hold bitcoin directly under that Act — which is exactly why it holds futures. The wrapper and the strategy are not two independent choices; one produced the other.
Where spot funds win
- They own the asset, so there is no basis risk between the fund and the coin.
- Fees of 0.14% to 0.25% at the competitive end, against 0.88% and up.
- No roll cost, because nothing in the portfolio expires.
- Tracking difference of a few basis points, and predictable.
- Deep options markets and penny-increment quoting on the largest fund.
Where futures funds still have a case
- Registered under the 1940 Act, with an independent board and fiduciary duties.
- Statutory leverage limits and affiliate-transaction restrictions.
- Eligible in plans and platforms that only admit registered investment companies.
- BITO pays a monthly distribution, which some holders specifically want.
- No direct custody exposure — no private keys anywhere in the structure.
How each is taxed
The two wrappers reach a US taxpayer differently, and the difference is worth understanding before you buy either in a taxable account.
A spot bitcoin trust is a grantor trust, which means you are treated as owning a pro-rata share of the underlying bitcoin rather than shares in a company. Gains and losses on sale are ordinary capital gains and losses. There is one quirk worth knowing: the sponsor fee is paid in bitcoin, and each of those payments is a small taxable disposal passed through to shareholders — a trickle of tiny realisations you did not initiate. And to correct a claim that circulates constantly, the 28% collectibles rate does not apply here; section 408(m)(2) covers tangible personal property, and bitcoin is not that.
A futures fund is a regulated investment company, so it distributes rather than passes through, and you receive a 1099 reflecting whatever the fund realised and distributed during the year. That includes BITO's monthly payments, which are not funded by anything bitcoin produces — bitcoin generates no income — but by the collateral portfolio and the mechanics of the futures position. The full treatment of both wrappers is in our bitcoin ETF tax guide. One rule applies to both: the wash sale rule does apply to ETF shares, even though it does not apply to directly held crypto.
Who each one suits
For the large majority of people asking this question, the answer is short. If you want long bitcoin exposure inside a brokerage or retirement account and you have a free choice, take a spot fund. It is cheaper, it tracks better, it holds the actual asset and it has no structural drag working against you. Our picks by investor type narrow that down further.
The futures case is narrow but real. It applies when the 1940 Act registration is the point — an investment policy statement that distinguishes between a registered investment company and a commodity trust, a trustee who needs an independent board, or a plan menu that will not admit a grantor trust at all. In those situations you are not paying 0.95% by choice; you are paying it for access that would otherwise not exist. That is a defensible trade. Paying it in an ordinary taxable brokerage account, where a 0.20% spot fund is one click away, is not.
And there is a third answer neither fund gives you. Both wrappers deliver price exposure and stop there. Neither lets you withdraw a coin, move it to your own custody, transact with it, or trade outside US market hours. If any of those matter, the comparison you actually want is the fund versus the coin itself, not spot versus futures. And if you have settled on a fund, buying one properly is a short exercise worth getting right.