In my home country there's a special tax rule for company cars. If you use a company car privately you have to add 22% of the catalog price (when it was new) to your income. This 22% is taxed according to your tax bracket (43% - 52%). This is based on the idea that having the private use of a company car is a kind of income.
I understand that there's a similar system in the UK.
What's the situation in the US? I've googled around a bit but I couldn't find anything.
Ximinez