HM Revenue and Customs sent about 81,000 warning letters to cryptocurrency investors in the UK tax year ended 5 April 2026, according to new figures supplied by accountancy group UHY Hacker Young. That is roughly 25 percent more than the 64,982 letters documented in UHY’s previous release based on HMRC data, and almost three times the roughly 27,700 sent in 2023 to 2024. The rise shows a larger compliance campaign, but the letters are not tax assessments and their recipients have not automatically been found to have evaded tax.
The latest count extends the acceleration reported when HMRC sent nearly 65,000 crypto tax letters in the prior year. UHY says the notices give recipients a chance to check their affairs and disclose unpaid tax before a formal enquiry begins. The practical pressure will increase again in 2027, when the first reports collected under the UK’s Cryptoasset Reporting Framework become due.
A nudge letter normally means HMRC has information suggesting that a return may be missing or inaccurate. The data could come from a UK exchange, banking records or another source available to the department. It asks the taxpayer to review the relevant years and correct any omission. It does not, by itself, establish that tax is owed or prove deliberate evasion.
That distinction matters because the supplied UHY release describes the letters as evidence of increased investigations. The figures measure compliance contacts, not opened investigations. HMRC may start an enquiry if a recipient does not respond or if the explanation does not resolve the mismatch, but a letter can also arise from incomplete information. Transfers between a person’s own wallets, for example, may look like disposals in a platform export even though beneficial ownership did not change.
Neela Chauhan, a partner at UHY Hacker Young, said younger traders may have limited experience dealing with HMRC and may assume the department cannot see their activity. She added: “The tax treatment of cryptocurrency in the UK is complex, and many individuals do not fully understand their reporting obligations or recognise when transactions give rise to taxable income or gains that must be disclosed to HMRC.”
A Crypto Swap Can Create A Taxable Disposal
The most common misunderstanding is that tax only arises when crypto is converted into pounds. HMRC’s Cryptoassets Manual says a disposal includes selling tokens for money, exchanging one token for another, spending tokens on goods or services and most gifts. Moving the same asset between wallets that remain under the same beneficial owner is generally not a disposal.
This means an exchange of bitcoin for ether can crystallise a capital gain even if no cash reaches a bank account. Each disposal must be valued in sterling at the transaction date, while acquisition costs and allowable fees must be tracked under the UK’s pooling and matching rules. Fragmented records across centralised exchanges, self-custody wallets and decentralised protocols can turn that calculation into the hardest part of compliance. The earlier growth of crypto tax reconciliation tools addressed the same recordkeeping problem, although software output still depends on complete and correctly classified inputs.
Income treatment is separate. HMRC says staking rewards are generally taxable as income when the activity is not itself a trade, with a later capital gains calculation if the received tokens are sold. Lending and decentralised finance arrangements require closer analysis because the contract can transfer beneficial ownership and trigger a disposal. Parliament has since moved toward a narrower no gain, no loss treatment for qualifying arrangements from April 2027, an approach covered in the new UK crypto lending tax rules.
What Changes Under CARF In 2027
The 2027 timetable needs precision. UK reporting cryptoasset service providers began collecting reportable information on 1 January 2026. Under HMRC’s current CARF guidance, their first report must be filed between 1 January and 31 May 2027 and cover the 2026 calendar year. Providers report identifying information and a summary of relevant transactions for users who are tax resident in the UK or another reportable jurisdiction.
UHY says HMRC will start receiving full data from businesses in 52 jurisdictions on 31 May 2027, with another 15 jurisdictions following in 2028. The official material does not support treating 31 May as one universal receipt date for all overseas data. It is the UK filing deadline. Cross-border exchange is enabled through the OECD framework and depends on each jurisdiction’s implementation, activated exchange relationships and reporting timetable. The OECD maintains the current signatory information, while HMRC directs providers to that live list rather than fixing the partner count in its guidance.
The description of “full transaction records” also needs qualification. HMRC’s published guidance says providers must report user details and a summary of transactions. The framework can give tax authorities acquisition and disposal totals by asset and transaction category, together with identifying data such as a name, address and tax identification number. A National Insurance number can serve as a UK tax identifier, but the rules do not mean every overseas platform will deliver a complete, trade-by-trade ledger for every customer on the same date.
Even with those limits, the change materially improves matching. Earlier UK CARF reporting coverage explained how exchange data can be compared with tax returns. The broader international CARF rollout reduces the value of using an overseas exchange merely to avoid domestic visibility. UK residence, rather than the location of an exchange or bank account, generally determines the scope of UK tax on worldwide income and gains.
Penalty Claims Need More Nuance
UHY’s release says penalties are capped at 30 percent of unpaid tax when an investor approaches HMRC first, rising to 70 to 100 percent after HMRC makes contact. Those are not universal bands. HMRC’s standard inaccuracy penalty table sets unprompted ranges of zero to 30 percent for careless errors, 20 to 70 percent for deliberate errors and 30 to 100 percent for deliberate and concealed errors. Prompted ranges are 15 to 30 percent, 35 to 70 percent and 50 to 100 percent respectively.
Higher ranges may apply to some offshore matters, while no inaccuracy penalty is due where reasonable care was taken. Interest and late-payment charges can be separate. A recipient therefore cannot infer a likely penalty from whether a nudge letter has arrived alone. Conduct, the tax year, the type of failure, the quality of disclosure and the location of the underlying matter all affect the result.
HMRC operates a dedicated cryptoasset disclosure service for unpaid capital gains tax or income tax. A disclosure does not replace current filing obligations, and someone who has received a letter should follow its response instructions. Taxpayers also need transaction histories, sterling values, fees, wallet transfers, income receipts and evidence supporting their cost basis before submitting a calculation.
Why The Letter Count Matters
The increase from about 27,700 letters to nearly 65,000 and then roughly 81,000 in two years shows that crypto compliance is moving from occasional outreach toward repeatable data matching. CARF adds a wider reporting channel, but it will not calculate a taxpayer’s final bill. HMRC will still need to distinguish taxable disposals from internal transfers, apply losses and pooling rules, and decide whether returns from staking or lending are income or capital.
For investors, the useful deadline is earlier than the first 2027 reports. Records for 2026 are already being collected, and corrections become harder once HMRC has indicated that it has found a discrepancy. The safest reading of the 81,000 letters is therefore neither that 81,000 people evaded tax nor that an automated system can settle every case. It is that HMRC is contacting more crypto users now, before domestic and international reporting gives it a broader set of figures to compare.