HM Revenue and Customs (HMRC) staff have pocketed over £12million in overpayments within the past 10 years, new reports show. Around 250 employees were mistakenly overpaid by more than £1,000 last year alone. The employees who received these extra payments were those who had left the company but messages did not get through to payroll to halt their salary payments. The tax officials have admitted to incorrectly paying staff £12.6million over the past decade. Those affected are now having to pay back what they owe. Staff have already paid back £12.3million, leaving a £300,000 shortfall, figures…