I have had several staff members come in to work today after receiving notification from HMRC that they have underpaid tax of £50.80 for the year 21/22 and asking for payment - Pretty sure these are genuine HMRC letters.  I have never had this in 20 years of running sage payroll, and certainly seems weird that they are the same amount (Employees all earning differing salaries).  Any ideas, or has anyone else had same issue?