According to a Chainalysis report released on August 26, potentially taxable onchain crypto activity exceeded $457 billion globally during 2025, while transactions within the practical reach of international reporting rules represented only 14% of the total. The analytics firm examined realized gains, income, and payments across Bitcoin, Ethereum, Solana, Tron, BNB Smart Chain, and Base, with the income category covering mining, staking, lending, and gambling. The report excluded activity recorded inside centralized exchanges, as trades conducted within their internal systems do not appear on public blockchains. As per Chainalysis, this $457 billion estimate represents a conservative floor for potentially taxable on-chain activity, as it only captures on-chain activity and excludes off-chain transactions that may also be taxable.
The United States generated the largest amount of potentially taxable crypto activity at $112.6 billion, according to Chainalysis calculations. The US figure was divided into $64.6 billion in payments, $30.1 billion in gains, and $17.9 billion in income. North America ranked first among regions with $134.6 billion, followed by the European Union at $125.1 billion and East Asia at $54.7 billion. Germany followed the US with $24.1 billion, while China accounted for $21 billion and the United Kingdom recorded $19.4 billion. India ranked fifth with $19 billion, followed by Brazil at $16.1 billion, Canada at $15.1 billion, and Japan at $13.2 billion. For smaller economies, the impact is particularly significant - Nigeria's $4.4 billion in taxable flows equals 12.3% of everything its government collects, while Kenya's $1.1 billion equals 5.6%.
Developed by the Organisation for Economic Co-operation and Development in 2022, the Crypto-Asset Reporting Framework (CARF) creates a system for participating tax authorities to exchange information about crypto transactions across national borders. Reporting Crypto-Asset Service Providers must collect customer details and submit transaction data to authorities with qualifying connections. Data collection started on January 1, 2026, in 48 jurisdictions, including the United Kingdom and members of the European Union, with most participating countries due to begin exchanging information in 2027. However, even within CARF's structure, covered events represented just 14% of the potentially taxable onchain activity identified in the report. The remaining 86% includes activity on decentralized exchanges, peer-to-peer transfers, onchain income streams and payments that fall outside CARF's scope. As Chainalysis notes, CARF applies to centralized crypto-asset service providers like exchanges and brokers, but a large portion of on-chain activity occurs on decentralized exchanges, peer-to-peer transfers, and other non-intermediated transactions which fall outside the framework's reporting requirements.
CARF's reliance on reportable service providers leaves much of decentralized finance outside its direct reach, as a decentralized exchange may operate through smart contracts without central custodians. Private wallets create another gap because users can hold assets and transfer funds without passing through reporting platforms. Cost basis presents additional problems, as when customers acquire crypto on one platform and later send it elsewhere for sale, the receiving exchange may know proceeds but not the original purchase price or holding period. Historical records can remain missing because CARF does not apply retroactively, and aggregate reports may lack transaction-level detail required to rebuild complete wallet activity sequences. For crypto users, this means that even if they transact on decentralized platforms or directly with peers, they are still legally obligated to report their taxable income in most jurisdictions, as the lack of automatic reporting does not eliminate the tax liability; it simply shifts the burden onto the individual to self-report accurately. The US demonstrates the scale of these challenges, with Senators pointing to studies suggesting a crypto tax gap of at least $50 billion annually.
To address missing platform data, Chainalysis suggests tax agencies can use blockchain analysis to follow transfers between wallet addresses, detect interactions with decentralized or foreign platforms, and identify income from mining, staking, lending, or liquidity provision. Onchain records may help reconstruct cost basis when assets pass through several wallets before reaching reporting exchanges. Such methods have already been used in tax investigations, with Italian authorities tracing more than €1 million in alleged undeclared Ordinals gains after examining seized hardware wallets in May. The Form 1099-DA rules born in the 2021 infrastructure law are projected to recover $28 billion over a decade, which spread out amounts to less than $3 billion annually against the $50 billion annual hole identified. The findings highlight a growing tension between the decentralized nature of cryptocurrency and the regulatory push for transparency, as many transactions occur outside the traditional financial system that tax authorities are accustomed to monitoring. While CARF represents a significant step forward in international tax cooperation, its limitations mean that many crypto users may still be able to avoid detection, and regulators must navigate this evolving landscape carefully as the rules around crypto taxation continue to develop.
