Hi njarecki,

You might want to reconsider paying your taxes to get miles.

Officialpayments charges a convenience fee of 2.35% (2.1% if you have a payment over 100K and use an Amex card). If you use an Amex SPG to earn Starwood points, you will get a 25% bonus when you convert. That works out to 2.35 cents/1.25 miles or 1.88 cents per mile. I personally was lucky enough to convert during the AA 35% conversion bonus promotion so it worked out for me to be 1.4 cents per mile.