Tax band for EV Salary Sacrifice

Hi, I cannot find a specific answer for the the below: Example: Salary is £51,500 (so above 20% basic rate threshold), however I sacrifice 9% to pension scheme, therefore the Taxable amount is lower. If I had to lease an Electric vehicle through a Salary Sacrifice scheme, is my tax band rate 20% or 40%? (portal gives me only option to enter gross salary, therefore calculating 40% tax band rate but I am not sure that is correct)

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