The only way to insure the taxes you are charges are correct is to get a printout of the full fare calc and use the tool for which ExMo provided a link.

Most likely the difference in taxes revolves around whether you are charged the taxes at a connecting airport. With some governments charging just to land, and others charging if you do not depart in 24 hours, while still other are charging if you do not depart on the same calendar day, it is no wonder many mistakes are made.

A reasonable understanding of the taxes charged is required if you intend to get the best deal for your money. And most importantly do not be afraid to challenge the rate desk when you think you found an error.

rich