Does anyone have experience of paying their tax bills with credit card, using a third-party payment system like B2BPay? Is it worth it? I may have this wrong, but as I understand it: If I pay, say, $150,000 then the processing fee from a third party could be as high as 2.4% ($3600). 150,000 Qantas points @ 1c each gives me a return of $1500 -- hardly seems worth it when I can do a funds transfer at no cost. Have I got the maths wrong?