Originally Posted by hauteboy
I could very easily add this sort of thing to my online validator tool; all I would need is the chart of fares/countries and taxes for each (that's the trickier part).
Tax calculations might be trickier, depending on stopovers/connections, but I could add a stopover/connection delimiter.
I don't know how often it's updated, and it's far from complete down to individual airports, but this site -
http://www.consolidatedtravel.com.au/qf/taxes.asp - seems to have a lot of info on taxes, fees, and fuel surcharges.