
A internal review has indicated that one in five of the records held by HM Revenue and Customs (HMRC) could be wrong.
The revelations come as tens of thousands of people begin to receive letters from HMRC informing them of inaccuracies in how their PAYE tax was calculated.
The latest review found that of the 45 million employment files held by HMRC, over nine million potentially contained mistakes.
Flaws in the tax system have left a group of cross-party MPs calling for reform, with the group's chairman claiming that HMRC is a 19th century organisation in a 21st century environment and saying that it was simply not up to the job of collecting income tax.

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