Bitcoin rally delivers $4.1 billion tax windfall for Strategy

Strategy estimated a $4.1 billion income-tax benefit after Bitcoin's fair value rose above cost as of Sept. 30, according to its Oct. 5 filing. The benefit comes from a lower estimated tax expense through an accounting adjustment.

The filing shows what can change when Bitcoin crosses a large holder’s cost basis. The next consequence depends on the position being measured: a company’s Bitcoin holdings, an ETF’s underlying assets and an investor’s ETF shares each have their own purchase history.

Strategy said it reversed a deferred tax asset related to its Bitcoin and released the associated valuation allowance. These management-prepared financial figures had neither been audited nor reviewed by KPMG.

The estimated benefit concerns the company’s own tax accounts and its September valuation-allowance adjustment.

The company disclosed 848,000 BTC at an average purchase price of $75,440.70, including fees and expenses, as of Oct. 4 at 4 p.m. Eastern time. That later acquisition figure has a separate cutoff from the Sept. 30 accounting comparison.

Fund cost and shareholder break-even are separate

An ETF acquisition estimate measures the fund’s underlying holdings. Maketo estimated the average cost of Bitcoin remaining in BlackRock’s iShares Bitcoin Trust ETF (IBIT) at $81,188 per BTC as of Oct. 2. Its model reconstructs underlying Bitcoin costs from daily money flows and prices.

An IBIT shareholder buys shares at a market price, so investors entering on different dates can have different break-even prices, even though their shares represent interests in the same pool of Bitcoin. The fund’s estimated acquisition cost measures a different position from each shareholder’s investment.

BlackRock’s Oct. 5 holdings file listed about 806,038 BTC, and its fund page reported nearly $69 billion in net assets and a Bitcoin benchmark level of $85,694.41 that day.

Its June 30 quarterly filing recorded 734,261 BTC with an investment cost of about $61 billion and a fair value of about $43.4 billion. That historical comparison places the same holdings below cost at the same cutoff.

IBIT calculates realized gains and losses on Bitcoin disposals using average cost, and the June filing records substantial activity in both directions. During the six months ended June 30, the Trust acquired 157,501 BTC and disposed of 192,970 BTC for share redemptions. Those categories include in-kind transfers.

Testing whether redemptions accelerated below cost requires daily flows, prices and cost estimates aligned to the same dates. The first-half totals leave the timing of trades relative to cost crossings, and investors’ motives, unresolved.

How a shareholder exit reaches Bitcoin

An investor can sell ETF shares in the secondary market. Redemption with IBIT is a separate transaction: only authorized participants can create or redeem baskets directly with the Trust.

IBIT’s prospectus distinguishes cash redemptions from redemptions in Bitcoin. With a cash redemption, the Trust converts underlying Bitcoin into cash, while an in-kind redemption delivers Bitcoin.

Share trading, cash redemptions and Bitcoin transfers describe different steps. The fund’s acquisition cost alone leaves those steps and the recipient’s subsequent decisions unmeasured.

US spot Bitcoin ETFs recorded net outflows of $89.8 million on Oct. 5, while Farside Investors’ data show that BlackRock’s fund recorded inflows in that same session.

That split captures a day of different flow directions across funds. Establishing whether cost-basis crossings influence those decisions requires comparing flows before and after the crossings over a longer period.

Crossing cost changes the gain-or-loss comparison on the underlying position, and Strategy’s filing demonstrates a material tax-accounting consequence.

Actual creations, redemptions, and the handling of redeemed Bitcoin are the next signals to watch for market impact. A shared price level, on its own, leaves the identity and motivation of the next buyer or seller unresolved.