Voluntary disclosure, without the panic
If you have bought, sold, swapped or earned crypto and never told HMRC, you are far from alone. Many UK investors simply did not realise their activity was taxable. The good news is that there is a clear, established route to put things right, and coming forward voluntarily almost always leads to a better outcome than waiting to be found.
This page explains who needs to disclose, how HMRC’s cryptoasset disclosure facility works, and how we support you through the process.
Who needs to make an HMRC crypto disclosure?
HMRC treats cryptoassets as chargeable assets, so Capital Gains Tax can apply when you dispose of them. A disposal is broader than many people think. You may have tax to declare if you have:
- Sold crypto for pounds or any other currency at a gain
- Swapped one cryptoasset for another, including stablecoin trades
- Spent crypto on goods or services
- Gifted crypto to anyone other than a spouse or civil partner
- Earned crypto through mining, staking, airdrops or as payment for work, which can be subject to Income Tax under HMRC’s Cryptoassets Manual
The Capital Gains Tax annual exempt amount is now just £3,000, so even modest gains can create a liability. If any of the above applies to you and you have not reported it, a voluntary disclosure is worth serious consideration.
What is HMRC's cryptoasset disclosure facility?
In November 2023 HMRC launched a dedicated facility for people to tell HMRC about unpaid tax on cryptoassets. You register your intention to disclose, then you have time to calculate what you owe, including tax, interest and any penalty, before submitting your figures and paying.
How many years you need to include depends on your behaviour. Broadly, that means around 4 years where you took reasonable care, 6 years where you were careless, and up to 20 years where the failure was deliberate. Getting this assessment right matters, because it shapes the whole disclosure.
Why disclosing beats waiting
Penalties scale with behaviour and with how the disclosure came about. An unprompted disclosure, made before HMRC contacts you, attracts significantly lower penalties than one made after a letter lands or an enquiry opens.
And HMRC increasingly does know. In the 2024-25 wave, HMRC sent roughly 65,000 crypto nudge letters, more than double the previous year. It already receives data from major exchanges, and from January 2026 the Cryptoasset Reporting Framework requires exchanges to report user and transaction data to HMRC automatically. If you want to understand quite how visible your activity is, read our guides on whether HMRC can track crypto and what to do if you receive a nudge letter.
Waiting rarely improves the position. Interest keeps accruing, the window for an unprompted disclosure can close without warning, and an HMRC-initiated enquiry is more stressful, slower and usually more expensive.
How Crypto Asset Consultants helps
Disclosures fail or drag on when the underlying records are incomplete. That is where we come in. We help you:
- Gather transaction histories from exchanges, wallets and DeFi platforms, including closed accounts where possible
- Reconstruct missing data using blockchain records and bank statements
- Calculate gains and losses correctly under the share pooling rules, including the same-day and 30-day rules
- Identify allowable losses that reduce what you owe
- Prepare a clear, well-evidenced pack for submission
We work hand in hand with an experienced crypto tax accountant UK clients trust, so the tax technical side and the crypto data side are handled together rather than falling between two stools. If you are not sure where you stand, a crypto consultation is the simplest place to start.
What happens after you disclose
Once your disclosure and payment are submitted, HMRC reviews the figures. In many cases that is the end of the matter. Sometimes HMRC asks follow-up questions, which is why a well-documented disclosure pays off: clear workings and evidence make queries quick to resolve.
Afterwards, you are on a clean footing. We help you set up simple record-keeping going forward so future Self Assessment returns are straightforward, and so the January 2026 reporting regime holds no surprises for you.
Frequently asked questions
Do I need to tell HMRC about my crypto if I never cashed out to pounds?
Quite possibly. Swapping one cryptoasset for another, spending crypto or gifting it to someone other than your spouse or civil partner are all disposals for Capital Gains Tax purposes, even if no money ever reached your bank account.
How far back does an HMRC crypto disclosure go?
It depends on behaviour. Broadly, HMRC can look back 4 years where you took reasonable care, 6 years where you were careless, and up to 20 years where the failure was deliberate. The disclosure facility asks you to assess this honestly, and it is an area where advice genuinely helps.
Will I definitely face a penalty if I disclose?
Not necessarily. Penalties depend on why the tax went unpaid and whether you came forward unprompted. A voluntary, unprompted disclosure generally leads to the lowest outcome, and in some reasonable care cases no penalty applies at all.
What if I have lost records from old exchanges or wallets?
This is very common, especially where platforms have closed. Transaction histories can often be rebuilt from exchange exports, blockchain records and bank statements. We help clients reconstruct their history so the disclosure is as accurate as possible.
Can Crypto Asset Consultants file the disclosure for me?
We prepare the groundwork: gathering records, calculating gains and losses and organising everything the disclosure needs. We then work alongside experienced crypto tax accountants so your submission is handled properly from start to finish.
What We Do
Portfolio Guidance
Our crypto consultants will educate you to invest in the safest and lucrative crypto assets.
Crypto Staking
Staking is a way to earn passive income from your cryptocurrency holdings.
Crypto Reports
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Crypto Tax Planning
Our consultants work alongside with our recommended crypto accountant to plan crypto tax.
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