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In most cases, you can find the invoice number at the top-left or top-right corner of the invoice. Every invoice must always have an invoice number.

If you use an invoice number series that follows the date, it should be updated accordingly. 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'.

How to assign an invoice number Use unique numbers. Make each invoice number unique to avoid confusion.Assign numbers sequentially.Designate invoice numbers chronologically.Consider using project codes.Use accounting software.Follow any regulatory guidelines.Double check your invoice numbers.Maintain your invoices.

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.

An invoice number is a unique number generated by a business issuing an invoice to a client. This number is included on the invoice and it is used for payment tracking purposes. When the client makes payment, they will reference this number to show that the funds are for that particular invoice.

They are approximately three to four digits long. An invoice number might also include a customer's name. An invoice number is based on the invoice number format or a numbering system that you choose.

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 2021-01-001. combining the customer code and date, for example XER-2021-01-001.