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Does HMRC check expenses?

In US, when you submit tax filings to IRS, they don't care what you wrote there, as long as you pay some tax.

Is UK the same? Do they check every transaction?
would assume they doing some rudimentary automated checks for reasonable expenses like where your address is etc.
If you earn 10k a year but have an address in mayfair. it might trigger something.
 
The Inflation Reduction Act (IRA) of 2022 gives the IRS $80 billion over ten years to hire up to 87,000 new IRS employees, largely to increase the number of tax audits. Individuals making under $400k per year are not supposed to get extra scrutiny; emphasis will be on high earners, large corporations, and partnerships.