Many people are not exactly sure how to claim their 30% Tax Credit on the cost of their Solar Install Cost. First off, it is a Tax Credit not a Rebate. What does that mean? First off, a Tax Rebate works like a rebate you would get from a coupon when you go grocery shopping. You mail in your rebate form with necessary documents and they mail you a check for the rebate amount. A Tax Credit can be applied to the amount of tax that you are required to pay in taxes at the end