New crypto tax UK 2026 rules went live on 1 January, as the Cryptoasset Reporting Framework (CARF) came into force across the UK. Every exchange, broker and custodial wallet provider must now report customer transaction data directly to HMRC.
Key figures at a glance:
- CARF regulations took effect on 1 January 2026, covering all UK-based reporting cryptoasset service providers (RCASPs).
- First reports to HMRC are due between 1 January and 31 May 2027, covering the full 2026 calendar year.
- Around ~50 RCASPs are currently in scope, according to the government’s impact assessment.
- HMRC sent an estimated ~65,000 nudge letters to suspected non-compliant crypto holders during 2024 to 2025, per UHY Hacker Young.
- Some 75 countries have committed to implementing CARF, with major hubs joining from 2027.
Why HMRC introduced CARF reporting
Cryptoassets have grown rapidly in the UK. An estimated seven million adults now hold around £12.9 billion in digital assets, according to FCA research cited by UHY Hacker Young.
Until now, HMRC relied on voluntary Self Assessment declarations and ad hoc data requests to individual exchanges.
CARF closes that gap by requiring standardised, automated HMRC crypto reporting from every in-scope provider.
What the new rules require
Every RCASP operating in the UK is now required to collect detailed data on each customer. This covers full name, date of birth, address, tax residency, National Insurance number or UTR, and complete transaction records.
Data collection began on 1 January 2026, with the first annual reports due to HMRC by 31 May 2027.
From 2027, HMRC plans to exchange this data automatically with participating tax authorities across the EU, the Channel Islands, Brazil and South Africa.
Major hubs including the UAE, Hong Kong, Singapore and Switzerland are expected to begin data collection from 2027, with exchanges from 2028. The US is expected to follow in 2028, with exchanges beginning in 2029.
The UK government’s impact assessment puts HMRC’s total IT and compliance costs for CARF at approximately £69 million.
Penalties for non-compliant RCASPs include fines of up to £300 per user for inaccurate reports and £5,000 plus £600 per day for late submissions.
How HMRC is already targeting crypto holders
HMRC has not been waiting for CARF to take action. Accounting firm UHY Hacker Young obtained FOI figures showing approximately 65,000 HMRC crypto nudge letters were sent during 2024 to 2025.
That represents a reported 134% increase on the roughly 27,700 letters issued the year before. HMRC has reportedly been receiving data from major exchanges since around 2021.
Andrew Park, Tax Investigations Partner at Price Bailey, described CARF as a watershed moment. He told the Financial Times it signals “the beginning of the end for crypto investors who thought they could invest in secrecy.”
HMRC has also opened an HMRC voluntary disclosure crypto facility for undeclared gains made before April 2024. This offers a route for investors to come forward before a formal investigation begins.
Crypto tax UK 2026: what counts as a disposal
A taxable disposal occurs when crypto is sold for fiat currency, swapped for another token, spent on goods or services, or gifted to a non-spouse.
Buying crypto with fiat, holding it, transferring between wallets owned by the same person, and gifts to a spouse or civil partner are not taxable.
Crypto capital gains tax UK rates stand at 18% for basic-rate taxpayers and 24% for higher and additional-rate taxpayers, following changes from 30 October 2024.
The annual exempt amount for the 2026 to 2027 tax year is just £3,000, down from £12,300 in the 2022 to 2023 tax year.
Heavy or frequent trading could be reclassified by HMRC as a trade, attracting Income Tax and National Insurance instead.
Crypto losses tax relief UK rules allow losses to be carried forward indefinitely to offset future gains, provided they are reported within four years.
What to do if you hold crypto
With HMRC now set to receive detailed data from exchanges, ensuring your crypto tax Self Assessment 2026 filing is accurate is essential.
The return now includes a dedicated crypto section, and Box 51 is used to split gains either side of the 30 October 2024 CGT rate change.
Steps to take now
- Review your full transaction history for every disposal since 6 April 2024, including token-to-token swaps.
- Calculate your total gains and losses for each relevant tax year, applying the £3,000 annual exempt amount.
- Declare crypto to HMRC through Self Assessment, using the dedicated crypto section on the return.
- Report any allowable capital losses within four years of the relevant tax year to preserve carry-forward relief.
- Consider HMRC’s voluntary disclosure crypto facility if you have undeclared gains from earlier years, particularly before April 2024.
- Check whether your disposals are taxable using HMRC’s cryptoasset guidance.
Penalties for deliberate omissions can be severe. HMRC has the power to assess up to 20 years of historical gains, with penalties reaching up to 200% of the tax owed.
Could you be owed a tax rebate?
If your crypto losses exceed your gains in a given year, those losses can typically be carried forward to reduce future tax bills.
You may also be due money back if you have been placed on the wrong tax code or have employment-related overpayments.
Tax Rebate Services can help you check whether you are owed a refund. The capital gains tax guide covers the key rules and reliefs that could apply to your situation.
