Complaints about customer service at HM Revenue and Customs (HMRC) have risen sharply over the past year, according to reporting that figures show a 66% increase. The complaints are described as relating to delays and mistakes, with taxpayers saying they experience problems when dealing with HMRC processes and responses. The coverage frames the increase as part of a broader concern about how HMRC handles customer interactions, including the accuracy of information and the timeliness of replies. While the reporting highlights the scale of the increase, it does not provide detailed breakdowns by complaint type, outcome, or specific HMRC teams. The accounts also do not state whether the increase is linked to any particular policy change, staffing level, or systems update. Overall, the reports indicate that more people are raising concerns with HMRC than in the prior year, with the main themes being administrative errors and slow resolution times.