The UK crypto market is getting a reminder that making money from a bull run can come with a second bill later.
HM Revenue & Customs (HMRC) sent 81,172 crypto tax warning letters, emails and text messages during the 2025/26 financial year. That is a noticeable jump from 64,982 warnings the year before and almost three times the 27,714 sent in 2023/24.
The timing is hard to ignore.
The crypto market went through some major moves between 2022 and 2025, and plenty of traders may have taken profits along the way without fully thinking about the tax side. Some may have sold coins for pounds. Others may have swapped one token for another or used crypto to pay for something.
For many people, the confusion comes from assuming that crypto tax only applies when you cash out into traditional money.
That isn't necessarily how the UK rules work.
A crypto transaction can become a taxable disposal when you sell crypto, exchange one cryptoasset for another, use crypto to purchase goods or services, or give crypto away in certain circumstances. Simply holding an asset, however, isn't normally the taxable event.
What has changed is how much information tax authorities can potentially access.
Since January 2026, cryptoasset service providers operating under the UK's reporting framework have been required to collect information about users and their transactions. The first reports covering 2026 activity are due to HMRC by May 2027.
That makes the old assumption that crypto activity is somehow hidden much harder to rely on.
Receiving a warning from HMRC doesn't automatically mean someone has done something wrong or definitely owes tax. But ignoring the message probably isn't a good strategy either. Unpaid tax can lead to penalties and interest, while HMRC also has a process for people who want to voluntarily disclose previously undeclared crypto income or gains.
For me, the bigger takeaway isn't really the number 81,000.
It's the direction things are moving.
Crypto may operate on public blockchains, but the tax consequences still exist in the real world. The bull market created plenty of profitable trades. Now HMRC is taking a much closer look at whether those profits were properly reported.
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