The Supreme Court of Pennsylvania ruled in favor of the state in a case brought by a customer over a denied refund of overpaid sales tax on orders where coupons were used. The customer was charged sales tax on the original price of the transaction, before the transaction total was reduced by coupons, and was denied a refund claim by the Pennsylvania Department of Revenue Board of Appeals. The customer appealed, and the Commonwealth Court ruled in favor of the customer.
Source: salestaxinstitute.com