P11D – How to get the correct % for a Car benefit
Article ID
p11d-how-to-get-the-correct-for-a-car-benefit
Article Name
P11D – How to get the correct % for a Car benefit
Created Date
3rd July 2025
Problem
Resolution
The full KB article on engine size and car benefit % calculation is here
The Car benefit % value is calculated using these factors:
a. Car Registration Date (as it uses either the NEDC or WLTP tables from HMRC)
b. Fuel Type. The ‘FUEL TYPE’ of the car may give different % rates – edit it to review the different % rates.
c. CO2 emissions /Approved zero emissions OR Engine Size. Check the values you entered in the two boxes: ‘CO2 emissions’ and ‘Approved Zero emissions’. These two entries OR Engine size correlate to the appropriate % rate (cross reference your entries with the HMRC table).
d. Check your looking at the correct HMRC period/year table- as each period/year may have different HMRC % rate tables.
e. Check the date in the field ‘Car availability- date car acquired’ – this can affect the final car benefit calculation at the bottom (remove/edit the date to see the change)
Please read the FULL KB link at the top of this article if you cannot find the answer.
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