If our company sells a solar system and the customer invoice is $2500.00, Then there is a rebate for $500.00. The customer pays for $2000.00 and we recieve (5 months later) a rebate from either the panel manufacturer, or the government, a rebate for $500.00, how is it recorded? Recognized as Revenue? Carried as a receivable? Discounted against the cost of material? Is the customer billed for $2500 or $2000?