Crypto & HMRC: The 5-Minute Yes/No Guide (UK Edition)
5 Hard Questions (5 Straight Answers)
No fluff. No jargon. Just what HMRC actually expects.
Here is what you do if you have losses, missed gains, or a messy crypto history—based on the HMRC Cryptoassets Manual and current UK disclosure rules.
1. “I’ve held crypto for many years but made losses. Should I file?”
YES – and you absolutely should.
Under HMRC rules, if you sell or dispose of crypto for less than you paid, that is an “allowable loss” . You can use it to:
Offset future capital gains
Carry forward indefinitely if not used
Crucially: If you don’t report the loss, you cannot claim it later. Even if you are under the £3,000 annual CGT allowance (for 2025-26), report the loss – it may save you tax in future years .
If your crypto is now worthless (e.g., a project collapsed), you can make a “negligible value claim” under Section 24 TCGA 1992. This treats the asset as disposed of at £nil, crystallising the loss .
Reference:HMRC Cryptoassets Manual CRYPTO41450 – Negligible value claims
2. “I have crypto gains but never filed in the past. How do I fix it?”
YES – use HMRC’s dedicated Cryptoasset Disclosure Facility.
HMRC launched a specific disclosure facility for cryptoassets in November 2023 . This is your best route if you have unreported income or gains from:
Selling or swapping crypto
Staking or mining rewards
Receiving crypto as payment
The process is simple:
Calculate the unpaid tax (use crypto tax software or an accountant)
Make a voluntary disclosure via HMRC’s Digital Disclosure Service (DDS) – selecting the cryptoasset route
Pay the tax owed within 30 days of submission
Benefit of acting first: Unprompted disclosures receive lower penalties and HMRC may waive late payment interest .
If HMRC contacts you first: Penalties can reach 150–300% of the unpaid tax .
3. “I have gains that were never reported on a tax return. How do I go about this?”
YES – same answer as #2, but with more urgency.
Unreported capital gains from crypto are treated the same as any other undeclared asset. Use the Worldwide Disclosure Facility (WDF) if your gains involve offshore exchanges or non-UK wallets .
Step-by-step:
Step 1: Gather all transaction history (even from closed exchanges)
Step 2: Calculate your gain per tax year (HMRC uses pooling and 30-day matching rules – see CRYPTO22500+)
Step 3: Disclose via the cryptoasset disclosure facility
Step 4: Pay tax + interest
Warning: HMRC estimates that 95% of UK crypto holders are non-compliant – and they are actively cracking down using new data sharing rules (DAC-8 and CARF) .
4. “Can I just close my exchange account and behave like I never traded?”
NO – and that would be deliberate non-disclosure.
Closing an exchange account does not delete your transaction history. Under KYC rules, exchanges retain your data and report to HMRC (especially after CARF takes effect in 2027) .
What HMRC can see:
Your deposits and withdrawals
Your trading activity
Your wallet addresses
HMRC’s position: Cryptoassets are not currency . They are property for CGT purposes. Ignoring this is tax evasion, which carries criminal penalties.
5. “I live abroad but traded crypto while UK resident. Do I have to do anything?”
YES – your UK tax liability does not disappear.
Under HMRC’s situs rules for crypto, the location of your cryptoassets is generally determined by the residency of the beneficial owner . That means:
If you were UK resident when you traded, those gains are within the scope of UK CGT
Moving abroad does not erase past liabilities
If you are a non-UK domiciled individual, special rules apply (remittance basis or the new FIG regime from April 2025) . But for most UK residents, the rule is simple: taxable at the time of disposal.
Action: Disclose any unpaid tax from your UK residency period using the Worldwide Disclosure Facility (WDF) – because the assets were held while you were UK resident .
UK-Specific Resources
HMRC Cryptoassets Manual:CRYPTO20000+
Disclosure Facility:GOV.UK – Cryptoassets disclosure facility
Report losses: Use SA108 (Capital Gains Tax summary) – boxes 13.1–13.8 and 45–48
Get professional help: Use a qualified accountant like ourselves with crypto experience – HMRC strongly recommends this for complex cases
Final word from HMRC:
“Each cryptocurrency is unique… and the statements made in the Capital Gains Manual come with more than the usual number of caveats.”
When in doubt, disclose. Penalties for voluntary disclosure are far lower than penalties for being caught.
Book a free initial consultation today and get personalised guidance from a qualified UK crypto accountant.
This blog provides general guidance only and is not legal or professional advice. We are not liable for actions taken based on this content. Full advice and protection apply only to clients
