You'd just have to buy your polo shirts from Primark. Company cars are a very nice perk though. Does it work like... tax band (as percentage) * price of car = extra earnings. Extra earning taxed at say, 40% ??? So 13% of £30,000 = £3,900 £3,900 /12 = £325 a month. Taxed at 40% = £130. So just the £130 is deducted as tax?