The "double miles" promo with UA Visa is continuing, so should be able to pay quarterly fed and other taxes throughout the year. And no cap on amount eligible for the double miles!

"Double miles" deal with SPG AmEx was capped at $5K, and offer was to end 4/17/06, so not there for payment of taxes at a later time.

CitibankAA "double miles" deal cheaper than UA Visa and SPG AmEx ones (1.99% vs. 2.49% "convenience fees"), but I don't hold that card, nor participate in AA FFP, so don't know more. Is CitibankAA double miles promo still open, so might pay taxes with it later in year?

So...will these "double miles" deals be continuing or recurring opportunities? (If AA one still there, I will look into that card and possibly use it to build miles with AA.) Any other twists or wrinkles to these deals, which seem to me very good? Are there other cards to consider for this purpose, that is accruing substantial miles at very reasonable prices? (I wonder if WSJ coverage boosted use of the cards for tax purposes. Would an increase in their use for this purpose be a good thing for us, perhaps encouraging more competition among card companies to get still more business, with added inducements, like lowered "convenience fees"?)