I have discovered that the P11D's we have submitted as a firm for clients who have provided cars where the CO2 is under 50g/km have been incorrectly calculated on the individuals DTA and tax codes. The approved zero mileage figure is shown correctly on our software and shown on the P11D provided to the client but is not being picked up by HMRC. HMRC are instead using the CO2 figure as the approved zero mileage figure and therefore figures for the benefit on the DTA and tax codes are less than the amount reported on the P11D. The class 1A NIC figure at HMRC is correct, presumably as this is taken from the P11D(b).
Has anyone else had this issue? We are stuck at the moment between HMRC not being able to investigate further and waiting to hear from our software provider. We would be interested to see if this is a wider issue or if it just us!
The software we use is P11D Enterprise supplied by BDO.