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You can use the ITA tool ITA Software: Login or similar to check another carriers prices and you can get breakdown of taxes.
The problem you face is taxes and charges may or may not include charges for fuel surcharge etc.
QF for example have a huge fuel surcharge (in the taxes and charges section) but AA do not, they put the fuel surcharge into there base fare.
Credit cards which earn frequent flyer points is a popular way to earn frequent flyer points. You can receive thousands of points on everyday spend. And, many of these cards offer generous signup bonuses! Compare to find the credit card that best suits your needs.