Company Car Tax- Salary sacrifice

I have a client who has a car sacrifice scheme in place through his employer. They have failed to account of this in the P60 figures and there is no P11D, HMRC instructed us to file an amended tax return for 2023 and include this figure into the return. Where can we enter this figure/ as this is a deduction rather than a benefit charge.

Hi,

If it is a company car, then it will be declared on the employment page on the Self Assessment tax return. 

Thank you.