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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.

Invoice numbers are a mandatory invoice field. They should be assigned sequentially, meaning that the number of each new invoice increases. Legally, an invoice number sequence should never contain repeats or gaps. It's not recommended to simply number invoices '1', '2', '3', etc.

Assign a Unique Identifier: If the invoice doesn't have a unique invoice number, you'll need to assign one. The identifier could be based on the date, the vendor's name, and/or the invoice amount.

This number is one of the most important elements of every invoice. Its role is to identify transactions, so it needs to be unique. Invoice number can contain only numbers or letters and numbers. It may contain date of issue, name of project or task.

Here are some options: Start with whatever number you like, and then make them sequential. Example: 00001, 00002, etc. Assign numbers chronologically, by date. Example: 010118, 010218, etc. ... Use a different dating system, for instance all the invoices in 2018 would start with 18. ... Assign by customers. ... Assign by project.

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.

If you use an invoice number series that follows the date, it should be updated ingly. For example, the invoice number 'INV-21-12-009' includes the month and year, referring to the ninth invoice issued in December 2021. The first invoice of the next month, January 2022, would be numbered 'INV-22-01-001'.