Itemised list of goods or services
Depending on the type of work that is being billed, a description of the work performed should be listed. For example, if the invoice is for a certain product, the product name, quantity, per-unit price, and total price should be listed on the invoice, typically in columns that run vertically on the page.
If the invoice is for services (for example, the completion of a design or writing project), then the name of the project, a brief description of the type of work performed and the hourly or flat rate should be listed. If it is an hourly rate, the number of hours worked should be included. If payment is per piece, each piece completed should be listed separately.
Underneath the listing of products or services being billed, there should be a clearly marked invoice total.