looks like the commonwealth bank diamond Amex card gets 3 points per dollar, and paying on the ATOwebsite the fee is 1.45% for American Express payments.
and the Diamond Master card gets 1.25 points per dollar spent, but the ATO credit card fee is reduced to 0.42% for VISA and MasterCard payments.
And at the moment the Commonwealth bank had a double point promotion with MasterCard for the rest of this month...
This is hurting my little brain, can someone work out which card to use whilst knowing the above?
Can I even use the Commbank Diamond Amex card for ATO payments? or is it just MasterCard that is still good?