I recently became aware of a self-employed builder who was caught completely unprepared by an HMRC tax audit.
Following the receipt of an initial 'nudge' letter, he is now negotiating a settlement near £350,000 to avoid a prison sentence. A fellow tradesman he knows suffered a nervous breakdown after HMRC identified a decade-long discrepancy between his declared tax returns and his extensive personal assets, which included buy-to-let properties, premium vehicles, cc bills and foreign holidaysetc, etc.
HMRC has significantly expanded these enforcement operations over the last 12 months, seeking to claw back substantial unpaid revenue from self-employed workers across all sectors. Between automated data-matching tools and tip-offs, historical tax evasion is being detected at an unprecedented rate. (How do I know, lol, I have a relative who works for HMRC and he has told me that AI is getting better and faster by the week at identifying potential tax evaders anf the government needs the money, so every penny counts)
This is what is happenign
If the automated system flags a major discrepancy, HMRC will typically send a n what they call a 'Nudge Letter' or launch a compliance check asking you to provide the records.
If a taxpayer refuses to cooperate or is suspected of serious fraud, HMRC can issue a Financial Institution Notice (FIN) to legally compel a bank to hand over full transaction histories without needing a court order.