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An invoice number is simply a unique record number assigned to each invoice you issue. This number can be automatically generated by invoicing software, if you use it, or you can manually create one when issuing the invoice.

Invoice numbers can help a business keep track of its expenses and incoming payments in an organized manner. It can be made up of just numbers, letters, unique characters, or a combination of these. The invoice number is usually located at the top of an invoice in the header section.

While it's up to you, most people would agree that the most convenient first invoice number should be '01'. Though, others prefer to add another zero, making the first number in the sequence '001'. From there, you can add unique identifiers such as customer numbers, a code for your business, or the date.

How to create an invoice number numbering your invoices sequentially, for example, INV00001, INV00002. starting with a unique customer code, for example, XER00001. including the date at the start of your invoice number, for example, 2023-01-001. combining the customer code and date, for example, XER-2023-01-001.

An invoice number can be any string of numbers and letters. You can use different approaches to create an invoice number, such as: numbering your invoices sequentially, for example, INV00001, INV00002. starting with a unique customer code, for example, XER00001.

Start with longer numbers Start by using a longer number, like 1001, for your first invoice. The next invoice number should be a sequential number that's easy to keep track of.

The ideal contents of a standard invoice are as follows: The standard invoice must have a header as 'Invoice'. Name, logo, address, and contact number of the seller. Name and address of the buyer, if it is a business-to-business transaction. Invoice reference number or invoice number.