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Does HMRC already have your crypto data?

The Crypto-Asset Reporting Framework (CARF) went live on 1 January 2026. Every UK-serving crypto exchange now reports customer transaction data to HMRC once a year, automatically. Pick the exchanges you've used and we'll show you which ones already share your activity with HMRC — and what that means for your 2026/27 Self Assessment.

Which exchanges have you used?

Tick every exchange or wallet type you've ever used, even briefly. Full picture matters — HMRC works from the aggregate.

Received a nudge letter already?

HMRC's crypto nudge-letter wave is powered by CARF data. If one has landed on your doormat, our step-by-step guide walks through what to do — including the 60-day disclosure window and the penalty differences.

Read the nudge-letter guide →

This tool is informational, based on publicly-announced CARF adoption by major exchanges as of Aug 2026, and does not constitute legal or tax advice. HMRC's scope is broader than any one platform — self-custody activity, DeFi, and OTC deals can still trigger scrutiny even when the on-ramp isn't on the CARF list.