Crypto tax rules may miss 86% of $457B in onchain activity, Chainalysis says

Chainalysis has estimated that potentially taxable onchain crypto activity exceeded $457 billion worldwide in 2025, while transactions within the practical reach of international reporting rules represented only 14% of the total.

Chainalysis said in an Aug. 26 crypto tax report that the other 86% included decentralized exchange activity, peer-to-peer transfers, onchain income and crypto payments that fall outside the practical scope of the OECD’s Crypto-Asset Reporting Framework.

The analytics firm examined realized gains, income, and payments across Bitcoin, Ethereum, Solana, Tron, BNB Smart Chain, and Base. Its income category covered mining, staking, lending, and gambling, while the payments estimate included merchant services and transfers that resembled peer-to-peer payments.

Activity recorded inside centralized exchanges was excluded because trades, staking, and lending conducted within their internal systems do not appear on public blockchains. The report also did not cover every blockchain, transaction type, or trading venue, leading Chainalysis to describe the $457 billion estimate as a “lower boundary.”

US crypto activity accounted for $112.6 billion

At $112.6 billion, the United States generated the largest amount of any country. Chainalysis divided the US figure 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, placing it ahead of the European Union at $125.1 billion and East Asia at $54.7 billion. Germany followed the US in the country table 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. Russia and Thailand generated an estimated $13 billion and $12.5 billion, respectively.

The calculations represent activity that could be taxable under commonly used rules rather than the amount of tax owed or unpaid. Chainalysis noted that local exemptions, tax rates, and classifications differ, meaning authorities would not collect the full value as revenue.

For US taxpayers, selling crypto for dollars, swapping one token for another, and spending digital assets can create taxable disposals under Internal Revenue Service rules. Mining and staking rewards can also count as ordinary income, while buying crypto with dollars or moving assets between wallets controlled by the same person generally does not create a taxable event, according to a recent US crypto tax guide.

US custodial brokers began filing Form 1099-DA for customer disposals made during the 2025 tax year. Gross proceeds are reported first, while cost-basis reporting phases in for covered transactions made in 2026.

According to Chainalysis, the US crypto tax gap was estimated at roughly $50 billion annually in 2022. The report cited congressional projections showing that Form 1099-DA could generate $28 billion in federal revenue over 10 years.

CARF captures activity handled by crypto intermediaries

Developed by the Organisation for Economic Co-operation and Development in 2022, CARF creates a system for participating tax authorities to exchange information about crypto transactions across national borders.

Reporting Crypto-Asset Service Providers, a category that largely covers centralized exchanges and brokers, must collect customer details and submit transaction data to the authorities with which they have a qualifying connection. Some retailers and wallet providers can also fall within the framework.

Data collection started on Jan. 1, 2026, in 48 jurisdictions, including the United Kingdom and members of the European Union. Most participating countries are due to begin exchanging the collected information in 2027, with other jurisdictions following in 2028 or 2029.

Closed order books operated by centralized exchanges offer tax agencies a clearer route to customer records because the platform normally knows who conducted each trade. CARF also covers some blockchain transactions, including certain deposits or withdrawals between a private wallet and an exchange when the transfer relates to a sale.

Even within that structure, CARF-covered events represented just 14% of the potentially taxable onchain activity found in the report. Chainalysis did not argue that the framework should be rewritten, saying its data can still give authorities information about transactions on platforms where most crypto trading occurs.

The EU is also implementing DAC8, which uses a scope similar to CARF while applying connection rules drawn from the Markets in Crypto-Assets framework. Under both systems, tax agencies can receive platform data even when a user conducts transactions outside their country of residence.

DeFi and private wallets leave transaction histories incomplete

CARF’s reliance on reportable service providers leaves much of decentralized finance outside its direct reach. A decentralized exchange may operate through smart contracts without a central custodian that controls customer assets or maintains complete identity records.

Private wallets create another gap because users can hold assets, interact with protocols, and transfer funds without passing through a reporting platform. Foreign services with no qualifying connection to a CARF jurisdiction may also sit outside its requirements.

Cost basis presents a separate problem. When a customer acquires crypto on one platform and later sends it elsewhere for sale, the receiving exchange may know the proceeds but not the original purchase price or holding period.

Historical records can remain missing because CARF does not apply retroactively. Aggregate reports supplied under the framework may also lack the transaction-level detail required to rebuild a complete sequence of wallet activity, according to Chainalysis.

Recordkeeping problems can increase when one investor uses exchanges, self-custody, staking, and liquidity pools. A public blockchain records contract calls and token transfers, but it does not automatically classify an event for tax purposes or establish the owner’s intent.

The same enforcement issue has appeared outside CARF’s first group of participating jurisdictions. South Korea has said its planned 22% crypto tax will cover income from private wallets and exchanges when the regime starts on Jan. 1, 2027, although its National Tax Service acknowledged practical limits in finding every unreported private-wallet transaction.

South Korean officials plan to use CARF and their overseas financial-account reporting system to obtain records from foreign platforms. Tax treatment for staking, lending, airdrops and hard forks remains under review as authorities prepare for the first returns covering 2027 income.

Blockchain records may supplement platform reports

To address missing platform data, Chainalysis said 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 also help reconstruct cost basis when assets pass through several wallets before reaching a reporting exchange. Linking those records to customer information from a regulated platform can give investigators a route from a transaction history to an identified taxpayer.

Such methods have already been used in tax investigations. In May, crypto.news reported that Italian authorities traced more than €1 million, or about $1.1 million, in alleged undeclared Ordinals gains after examining a seized hardware wallet.

Investigators in Foggia and Rome used exchange records and blockchain transaction patterns to follow proceeds from Bitcoin Ordinals and BRC-20 token sales, according to Chainalysis. The firm said the suspect allegedly created the assets, sold them for several times their original cost, and routed the proceeds back to a main Bitcoin wallet.