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  3. How is my P11d benefit in kind calculated for my car?
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  3. How is my P11d benefit in kind calculated for my car?

How is my P11d benefit in kind calculated for my car?

If your company car (owned, leased or hired by the company) is available to you for personal use, then a benefit in kind arises and is taxed on your personally.


In order to work out the value of the benefit, you need to collate the following information:

o    Find the price of the car – this is the list price when new and you should add any additional accessories if these weren’t included in the list price.

o    If you have made a capital contribution to the car, this should be deducted from the list price.
o    The list price is then multiplied by a percentage based on the car’s CO2 emissions or the range that the electric car can travel.

Petrol powered and hybrid powered cars for the tax year 2024 to 2025

CO2 emissions (grams per km)Electric mileage rangeNEDC %WLTP %
0N/A22
1 to 50 130 and above22
1 to 5070 to 12955
1 to 5040 to 6988
1 to 5030 to 391212
1 to 50less than 301414
51 to 541515
55 to 591616
60 to 641717
65 to 691818
70 – 741919
75 to 792020
80 to 842121
85 to 902222
90 to 942323
95 to 992424
100 to 1042525
105 to 1092626
110 to 1142727
115 to 1192828
120 to 1242929
125 to 1293030
130 to 1343131
135 to 1393232
140 to 1443333
145 – 1493434
150 to 1543535
155 to 1593636
160 to 1643737
165 to 1693737
170 and above
  • For each tax year add 4% for diesel cars up to a maximum of 37%. Cars that meet the Real Driving Emissions Step 2 (RDE2) standard are exempt.
  • There may be further adjustments to this figure if the car was not available during the tax year.

Calculation example

A director has a company car with a list price of £38,639.

Its CO2 emissions are 119 g/km.

If we look at the table for 2024/25 we will multiply the list price by 28% so the BIK is £10,818 if you had private use of the vehicle for the full tax year.

If the car is diesel, then there is a 4% supplement added – so the percentage applied would be 32%. (The maximum percentage that can be applied to the list price is 37%.)

Therefore the director will pay personal tax on this amount, if he is higher rate tax payer, this will be £10,818 x 40% = £4,327.20.

The company will also pay Class 1A National Insurance of £10,818 x 13.8% = £1,492.88.

Updated on 3rd May 2024

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