# What is an HMRC crypto nudge letter?

HMRC sends nudge letters when exchange data suggests you may have undeclared crypto tax. Review your records and respond — use the voluntary disclosure service if tax is owed. Ignoring letters can lead to formal enquiry.

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— Digital Assets UK (https://digital-assets.co.uk/answers/hmrc-nudge-letter-crypto/), reviewed 2026-06-23.