Been paying my tax with AMEX Plat for a while now but only just did some calculations....
UK return in J = 256,000 QF points.
256,000 points requires a $512,000 spent using my AMEX at the ATO.
A $512,000 spend @ 1.45% surcharge = $7,424
Purchasing a return QF flight in J = $7,681
With many UK...