Your employer takes the tax you owe from your wages through Pay As You Earn (PAYE).
The amount you pay depends on what kind of benefits you get and their value, which your employer works out.
Some company benefits can be tax-free, eg childcare and canteen meals.
You have to pay tax and National Insurance on things that are paid in cash, as they’re treated as earnings.
For the tax year ending on 5 April 2016, you won’t pay tax on company benefits if you earned less than £8,500 (including the value of the benefits).