I actually do only compare the final prices with taxes and insurance, but a few quotes have shown each item individually and it was interesting to see how the government tax rate varied from 10% to 20%. Some also charged an additional 5% surcharge and a $15-$18.75 airport fee. I really want someone knowlegable to inform me of the proper government tax on rental cars. Surely there is a rental agent who actually knows this information and charges the correct amount. In most countries you can' t just charge whatever you want. There are actually rules to follow!