This increase seemingly is due to errors and glitches in the new HMRC system, which was designed to make PAYE processing faster and more accurate.
The Independent quotes an HMRC spokesman:
"Over and underpayments have long been a feature of the PAYE system. But our contact centres are able to correct inaccuracies, in part because of the new system."
The new system has caused more problems, but the new system is able to correct the problems that it is causing.
So that's alright then!
Tax does have to be taxing.
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