Fake receipts have always been part of expense fraud. What's changed is how convincing they've become. AI generated receipt fraud is now a real and growing problem for UK accountants, and the tools producing these documents are widely available, cheap, and getting better fast.
In November 2025, ICAEW published guidance on how to spot an AI-generated receipt, flagging the issue as one that accounting practices need to take seriously. This isn't a niche concern. It's mainstream fraud using mainstream tools, and it lands squarely in your lap.
This post covers what AI generated receipt fraud looks like in practice, the red flags to check for, and how automated detection helps catch what a tired human eye will miss.
Why AI Generated Receipt Fraud Is Harder to Catch
A manually forged receipt usually has tells. Wrong fonts. Misaligned text. Numbers that don't quite add up. A trained eye can often spot the problem within seconds.
AI-generated fakes are different. The tools used to produce them have been trained on thousands of genuine receipts. They replicate layouts, fonts, and formatting with a level of consistency that makes a quick visual check almost useless. The receipt looks real because, in every surface-level respect, it is designed to look real.
This matters because most receipt review processes still rely heavily on a human reviewer glancing at a document and making a judgement. That worked well enough when fakes were crude. It's not enough now.
The ICAEW guidance highlights that AI-generated receipts often pass basic inspection precisely because they mimic genuine documents so closely. The errors that exist tend to be structural or data-level, not visual.
Actionable takeaway: Stop relying on visual checks alone. If your review process amounts to "does this look like a receipt?", it will not catch AI-generated fraud.
Red Flags to Look For in Expense Claims
Knowing what to look for gives you a fighting chance. These are the most common indicators that a receipt may be AI-generated or otherwise fraudulent.
VAT Number Problems
VAT numbers follow a specific format in the UK: nine digits, usually displayed as GB followed by nine digits. AI-generated receipts sometimes include VAT numbers that are structurally wrong, invented, or belong to a different business entirely.
