New UK crypto rules now apply. Here’s how mandatory reporting affects contractors

On January 1st 2026, a significant change in the UK's approach to cryptocurrency taxation came into force, with implications for contractors and other Britons holding, trading or earning crypto assets.

Who do the new mandatory reporting crypto rules apply to?

Under the new rules introduced earlier this month by HMRC, crypto account and transaction details must now be reported by cryptocurrency exchanges and wallet providers automatically to the tax authority.

This new mandatory reporting requirement reduces the scope for crypto activity to go unnoticed by HMRC, writes Dan Mepham, managing director of contractor accountancy firm SG Accounting

Furthermore, the now in-force January framework brings crypto much closer into line with traditional financial assets, reflecting HMRC's intention to treat digital currencies as a mainstream part of the tax system.

What is the Crypto-Asset Reporting Framework (CARF)?

The changes stem from the UK's adoption of the Crypto-Asset Reporting Framework (CARF), an international tax transparency standard developed by the OECD (Organisation for Economic Co-operation and Development).

CARF requires crypto exchanges and other Crypto-Asset Service Providers (CASPs) to collect information about their users and report it to tax authorities.

Under January's new crypto rules, crypto-asset platforms — whether based in the UK or overseas but serving UK residents — must gather personal details including name, address, date of birth and tax residency.

What information are CASPs required to report to HMRC?

CASPs must also report transaction data covering purchases, sales, swaps, transfers and realised gains/losses. All that information is then passed automatically to HMRC, allowing the UK tax authority to cross-check reported activity against tax returns.

In line with a Budget 2025 policy paper, CARF came into force at the start of 2026. As a firm of trusted accountants to contractors and others with crypto asset revenues, our assessment is that the framework represents one of the most substantial regulatory changes to the UK crypto market.

Why HMRC is now acting on crypto

HMRC has long made clear that crypto assets are not tax-free.

CGT (Capital Gains Tax) can arise when crypto is sold, exchanged or used to pay for goods or services, while income tax may apply to activities such as mining, staking or receiving crypto as payment.

Historically, however, enforcement has been challenging.

The decentralised nature of crypto trading and the lack of consistent reporting by exchanges made it difficult for HMRC to build a complete picture of an individual's activity. CARF is designed to close that gap, giving HMRC far greater visibility and making under-reporting (deliberate or otherwise) much harder.

What this means for crypto-contractors and other UK crypto investors

For UK investors including contractors who hold digital assets, the practical impact of CARF is clear: crypto activity held on exchanges is now visible to HMRC.

Therefore, investors should assume that transaction histories can and will be matched against Self-Assessment tax returns.

This places greater importance on accurate record-keeping and correct tax calculations.

Why multi-platform crypto holders might invest in a modern accountant

Crypto tax is rarely straightforward. Multiple transactions, asset swaps, pooled cost calculations, and differing tax treatments for income versus capital can quickly become complex, particularly for those trading across several platforms.

As a result, many investors are finding that professional support is increasingly valuable. An accountant who understands how crypto works (in relation to wallets, exchanges, forks, staking and decentralised finance) can help ensure:

Is it illegal not to share your details?

The new UK crypto rules under CARF do not require individuals to hand private keys or wallet passwords to HMRC.

However, investors still have legal responsibilities.

Can Britons simply opt out of the new crypto rules?

In practice, opting out of the reporting regime is simply not possible if you're a UK contractor using crypto platforms regulated by the Financial Conduct Authority (FCA). [Editor's Note: An FCA consultation for these parties is still open but closes on February 12th 2026].

For contractors holding crypto, HMRC's increased access to data also makes it easier for the tax authority to ask follow-up questions about how crypto investments were funded, and whether profits have been taxed appropriately.

CARF impact on contractors

For freelance and contract workers who invest personally, crypto now sits firmly alongside shares and property in HMRC's compliance toolkit.

As reporting becomes more comprehensive, inconsistencies are more likely to be flagged automatically.

With that in mind, seeking advice from an accountant who understands both tax law and crypto mechanics can be a sensible step. Not because crypto is inherently risky, but because its tax treatment is nuanced, evolving and increasingly visible.

And finally, prepare for greater scrutiny

As HMRC tightens its grip on digital assets, the message is clear — crypto may be innovative, but from a tax perspective, it is now very much part of the mainstream.