An audit is an investigation carried out by HMRC to ensure a business is tax compliant. It can range from a request for records, to a longer and potentially more disruptive process where investigators go through all your financial information looking for errors or evidence of fraudulent behaviour. Both, and everything in between, can be stressful.
HMRC don’t limit their focus to big businesses, money launderers, or deliberate tax avoiders. Any business, big or small, can be subject to an investigation if they suspect something’s not right in the accounts. Or even if they just fancy doing a spot check.