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The exact number of incorrect coding notices issued by HMRC is not known. In any year, a small percentage of tax codes will be incorrect, as the codes may not always reflect changes in an individual's circumstances. That is why HMRC send out coding notices well in advance of the start of the new tax year so that customers can review them and report any changes.
Information relating to costs for the last 12 months in respect of incorrect coding notices is not available.