Originally Posted by Mwenenzi

Real taxes on award flights are the same for all airlines for the same route and class. A surcharge can trigger additional real taxes if the flight changes from a non revenue flight to a revenue flight.

A "carrier imposed surcharge", as QF & BA apply on awards, goes direct to the airline (=profit). A "carrier imposed surcharge" is not a tax. Those who mix taxes and surcharges and consider surcharges as taxes are being take as fools by the airline (they like it that way)
.