Originally Posted by Family flyer
What procedure have people used if they owe an amount that exceeds the double-miles limit? For example, SPG gives double miles up to $5K and you owe $8K. You charge $5K. How do you pay the remainder with a check or auto-debit? In other words, can you pay taxes with two different forms of payment?
Yes, I've done that many times. You just process your credit card payment the usual way, and submit a check, auto-debit or whatever else is proper, for the balance. The IRS is keeping score on your payments, so when you claim payments of $x, the computers will add up payments from all sources to be sure that you have, in fact, paid $x.