What is the difference between an Invoice and a Sales Receipt? An Invoice records a sale and how much your customer owes. A Sales Receipt records the customer payment and can be used as a receipt when they pay their invoice. An Invoice keeps track of future sales. A Sales Receipt records sales in the current accounting period. An Invoice records a sale and how much your customer owes. A Sales Receipt records a sale and the payment you received (it doesn't track any amount as owed). An Invoice can be used to record customer and vendor transactions. A Sales Receipt only records customer sales