IRS Targets Crypto ETFs with New Tax Notice Amidst BlackRock's IBIT Success

The Internal Revenue Service (IRS) has recently put crypto exchange-traded funds (ETFs) on notice, signaling potential regulatory changes that could impact funds holding digital assets. This warning comes as BlackRock's iShares Bitcoin Trust (IBIT) experiences significant inflows, highlighting the contrasting dynamics in the crypto ETF market.

IRS Notice on Crypto ETFs

On Monday, the IRS issued a notice targeting funds that utilize trading strategies to avoid booking gains from digital assets. This notice follows the IRS's recent shutdown of a tax-free stock swap used by wealthy investors, both actions aimed at enforcing compliance with tax regulations. The IRS has flagged that some ETFs may be circumventing tax obligations by transferring rising digital assets to trading firms without recognizing a taxable gain.

Impact on Crypto Funds

While the notice does not specify which funds are at risk, it raises concerns for those that hold crypto directly or through trusts. Notably, funds that utilize offshore subsidiaries may be exempt from these new regulations. The IRS has indicated that any forthcoming guidance could apply retroactively, affecting past transactions.

BlackRock’s IBIT Leads Market

In a contrasting development, BlackRock's IBIT has emerged as a leader in the crypto ETF space, attracting $55 million in inflows on a single day, contributing to a total of $31.1 million for all US spot bitcoin ETFs. Over the week ending September 25, IBIT captured approximately $1.2 billion of the $2.4 billion in net inflows for the category, marking a significant recovery in the market.

Market Dynamics

The recent inflows into IBIT signal a resurgence in investor interest, reversing a trend of negative flows earlier in the year. The total cumulative inflows for US spot bitcoin ETFs have reached about $57.6 billion, with net assets nearing $108 billion. In contrast, spot ether ETFs have also seen a rebound, accumulating $690 million after a previous outflow.

As the IRS continues to scrutinize the crypto ETF landscape, the market dynamics remain complex, with leading funds like IBIT benefiting from increased liquidity and investor confidence.

New Developments in Crypto ETFs

On September 28, 2026, BlackRock’s iShares Ethereum Trust (ETHA) saw net inflows of $15.35 million, equivalent to approximately 5,730 ETH purchased in a single day.

In the week leading up to this date, US spot Ethereum ETFs collectively attracted around $690 million in net capital, with ETHA contributing $326 million, nearly half of the total.

By the end of September 2026, ETHA’s cumulative net inflows surpassed $13 billion, a remarkable achievement for a product launched in July 2024.

The overall Ethereum spot ETF category has reached approximately $17.78 billion in assets under management, with ETHA holding the majority share.

Additionally, BlackRock launched the iShares Staked Ethereum Trust ETF (ETHB) in March 2026, which allows investors to earn staking rewards without running a validator node. Since its launch, ETHB has experienced zero outflow days.

Together, ETHA and ETHB account for about 5.4% of Ethereum’s overall market capitalization as of late September 2026.