The UK’s tax authority, HM Revenue & Customs (HMRC), has intensified its hunt for unpaid crypto taxes, sending nearly 65,000 warning letters to investors in the 2024–25 tax year, more than double the number from the year before. The sharp rise marks a new phase in the government’s crackdown on undeclared digital asset gains as crypto ownership surges nationwide.
HMRC Steps Up Surveillance
According to the Financial Times, the surge in letters, often called “nudge letters,” reflects HMRC’s growing focus on voluntary compliance. These notices encourage crypto investors to correct their tax filings before the agency launches formal investigations. Over the past four years, more than 100,000 such letters have been issued, signaling how seriously HMRC is treating crypto-related tax reporting.
Tax experts say many investors may not even realize they owe capital gains tax. “The tax rules surrounding crypto are quite complex,” said Neela Chauhan, a partner at UHY Hacker Young, the firm that obtained the data through a Freedom of Information request. “Even moving from one coin to another can trigger a taxable event.”
Better Data, Bigger Reach
HMRC’s ability to monitor crypto activity has expanded significantly. It now receives transaction data directly from major exchanges, and by 2026, it will gain automatic global access to exchange records under the OECD’s Crypto-Assets Reporting Framework (CARF). This framework will make it easier for tax authorities worldwide to trace crypto transactions across borders, reducing the chances of investors hiding assets overseas.
The move comes as crypto adoption in the UK continues to climb. The Financial Conduct Authority (FCA) estimates that seven million UK adults now own cryptocurrency, up from five million in 2022 and just over two million in 2021.
Global Crackdowns on the Rise
The UK isn’t alone in tightening crypto tax oversight. In the United States, lawmakers are debating whether to exempt small crypto transactions (under $300) from taxation and clarify how staking rewards should be treated. Meanwhile, South Korea’s National Tax Service has warned that even crypto assets held in cold wallets could be seized if linked to unpaid taxes.
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FAQs
Yes. In the UK, you typically pay Capital Gains Tax on profits when you sell, trade, or spend your crypto. You must declare these gains to HMRC.
HMRC receives transaction data directly from major crypto exchanges. New global rules from 2026 will make tracking crypto assets across borders even easier for tax authorities.
HMRC may send a “nudge letter” urging you to correct your return. Ignoring this can lead to formal investigations, penalties, and interest on the unpaid tax amount.
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