Do you have to pay sales tax on Energy Star replacement windows?

It depends entirely on the state (and sometimes on the local taxing bodies in the state). You cannot make any general statements on a national basis. For example, you would not pay sales tax on candy...

How much sales tax do you pay on a used $22,000 vehicle? How much sales tax do you pay on a used $22,000 vehicle?

If you purchased the car from a dealership, the dealer collects it from you and pays it. If you purchased the car from a private owner, the county courthouse will collect it from you when you get it...

The person who is buying the product pays the sales tax.

Probably the total price you paid for the vehicle - less the value of any trade multiplied by the tax percentage of your state: Example $20,000 vehicle minus $5,000 trade value = $15,000 X 5% =...