A service or goods provider may need to create a revised invoice if the customer changes an order. Revisions may also be necessary if the provider ran into problems with providing a service or the customer asked for additional services after receiving the initial invoice. The method for creating a revised invoice differs according to the method used to produce it.
For service providers who hand-write or print invoices from a computer, creating a revised invoice is simple. Create a new invoice with a new date on it. Across the top or bottom of the invoice, print or write "Revised Invoice." Put the original dates of service, item numbers, and other pertinent details so the billing is recorded in the proper month. If the customer is aware of the revised invoice and the reasons for it, no further explanation is necessary. However, if the customer is unaware, include a short note explaining the reason for the revision.
Many small businesses use online auction or sale sites to sell products. Creating a revised invoice on most of these sites for the purpose of combining shipping costs or revising method of shipment at the customer's request is the same as sending an original invoice. The seller uses the invoice system to create a new invoice and send it to the customer. The customer should ignore the original invoice and pay the revised one.
Accounting programs for businesses often have an invoice feature. Some do not allow revisions to the original invoice, so the business owner creates a new invoice and encloses a note. Other programs allow the owner to open the original invoice, make changes, then save. These programs allow the sender to include a note explaining the revisions.