We are having a concerning amount of trouble with fraud...it appears that they (the conmen) have enough details to realistically impersonate HMRC employees. They also send letters that look 100% real but have payment slips with different bank account numbers. They have 0300 phone numbers, they know your reference numbers and they know your current bill. Until this is sorted I would suggest refusing to pay if anyone calls or writes to your company (or self-employed self or tax credit overpayments) claiming to be HMRC and then call us only on the numbers I'm listing here to confirm and discuss. Please keep these for reference. PAYE: 0300 200 3859 SA: 0300 322 7823 VAT: 0300 200 3838 CT: 0300 322 7831 TC: 0300 322 7832 (tax credits) Best wishes.