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Invoice number - What is an invoice number? An invoice number is a unique, sequential code that is systematically assigned to invoices. Invoice numbers are one of the most important aspects of invoicing as they ensure that income is properly documented for tax and accounting purposes.

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 number examples Some examples of common invoice number formats include: 2021-027: This refers to the 27th invoice issued in the year 2021. 2021/INV/017: This refers to the 17th invoice issued in the year 2021. ?INV? stands for invoice to differentiate it from other sales documents such as quotes.

Use unique numbers Make each invoice number unique to avoid confusion. Duplicate invoice numbers may get misfiled, discarded or processed multiple times. For example, if you start your invoice numbering with 0001, avoid starting over with the same number the following month or year.

1 The name and address of your business For all businesses, it's helpful also to include your contact details on an invoice, including your: Name. Phone number. Email address.

You will usually find this unique sequence of characters at the top of an invoice in the header section. That is because every new invoice should have a unique number generated to help sort and identify invoices in an accounting system.