Originally Posted by acf573
Even if you have a refund for 2005, you can make an estimated tax payment for 2006 (whether you need to or not). This can really pay off:
Example: Charge $5,000 and pay a fee of $124.50. Receive 10,000 SPG points, which can buy 1 night at the Sheraton Park Lane in London. Cheapest rate at the Park Lane is around 149 pounds = $260.
Net gain = $135.50, or more than a 50% discount on the room.