I'm a novice and this is my first post so I apologise if I seem "green".Amex $100 x 1.45% = $1.45 for 300 CBA pts = 150 QFF points or 0.96c per point
MCard $100 x 0.42% = $0.42 for 100 CBA pts = 50 QFF points or 0.84c per point
The general rule seems to be, if you need the points, pay with Amex, if you like the points, but don't want to spend a lot pay with Amex.
I am with WBC Altitude Black so I get 1.25 WBC points per $ on MC and 3 WBC points per $ on Amex, so MC is a much better deal.
WBC MC 0.673c/FF pt v Amex 0.966c/FF pt - Amex points cost 45% more than MC ones, but, of course, you get more points.
If I had, say, $100k tax to pay and I have lots of points, I would prefer to pay CC fees of $420 rather than $1,450 of cash now and would receive 125k WBC points, worth 62.5k KrisFlyer points I may use sometime in the future. Amex would get me 150k points for $1,450.
If you need the points to get enough to redeem a flight, and they cost you 0.966c / point with Amex and you can then redeem them for a business class seat for 3-4c per point then you are still ahead.
Hope this helps.
Angus
I have an AMEX platinum and recently had to pay off a tax bill worth a few thousand.
The fee for paying via AMEX was around 1.45%, for argument sake, let's say my tax bill was $1000, it means fee of $14.50. Now tax payments only get half points, meaning I get 500 points which are redeemable at 1:1, meaning each point is valued at 2.9c, which is expensive. I chose to pay via direct transfer.
I'm trying to accumulate as many points like everyone else, am I missing a trick here??
Thanks.