Based on this I would think that the conversion rate on the TURBOTAX offer to subtract the cost of the service from your return for a HUGE 100% fee (meaning the

Based on this I would think that the conversion rate on the TURBOTAX offer to subtract the cost of the service from your return for a HUGE 100% fee (meaning the cost of that method of payment is as much as the tax service itself) but allows you to skip the entering of your CC information, given that it comes at the end of doing your taxes, is probably pretty high. They should try a cake add on.