The company provides the sales reps with pay-as-you-go mobile phones, who purchase top-ups when they need them, claiming the cost back on expenses. Does the cost of the top-ups need to be included on the forms P11D for those employees? Does it make a difference if the employee bought the pay-as-you-go phone?
Where the mobile phone is owned by the company and the contract is between the company and the telecoms provider, any top-ups purchased for that phone are tax free, as the provision of the phone is tax free. The cost of the vouchers does not have to be reported on the form P11D for each employee. Note this tax-free treatment only applies to one phone per employee.
If the phone was bought by, and thus owned by the employee, the top-up vouchers are taxable and need to be reported on the form P11D. The employee could claim a deduction on their tax return for the cost of business calls made with the top-up payments, but this would involve analyzing all the calls made into the business and non-business calls.