A debit note is a document sent by a buyer to seller or in other words a purchaser to a vendor notifying that a debit has been made to their accounts. A debit note is a document that adjusts the amount due for a sale of goods or services between buyers and sellers. Learn when and why a debit note is issued, how it affects accounting records, and see a practical example. A debit note is a document a seller uses and issues to let the customer know of existing debt responsibilities. It might act as a reminder for missed payments or offer details about forthcoming invoices. Buyers can also write debit notes upon credit-based returns of items acquired.