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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.

Yes, Invoices may need to be numbered serially and also need to follow other rules if they are to be accepted for particular purposes depending on jurisdiction. This requirement is so that you can be audited correctly for tax, excise and other such liabilities.

Sequential Invoice Numbering You could start with 1, 2, 3, or even 00001, 00002, 00003. The most common sequential invoice numbering approach is to start with 0000000001 (9 zeros, followed by a 1). When doing this numbering manually, always write down the customers' name and amount owed in a separate sheet.

An invoice number is a number assigned to uniquely identify invoices. It generally appears near the top of the invoice document so it can be easily noted by both the recipient of the invoice and the business providing it.

Chronological Invoice Numbering The first series of numbers is the date, the second series of numbers is the customer number and the third series of numbers is the sequential unique identifier for the invoice. If you generate a second invoice on that date for that customer, the invoice number will be 20170630-4072-01.

It can be argued that the invoice number is one of the most important components of an invoice other than the amount owed, of course. That's why it's important to have a firm grasp on what is invoice number. Having a numbering system allows you a means to identify each invoice.

Best practices on numbering invoicesMake every invoice number unique you can start from any number you want.Assign sequential invoice numbers.Assign invoice numbers in chronological way.Structure invoice numbers any way you want, you may: use only numbers 001, 002, 003 etc., include Customer Name CN001, CN002, etc.More items...?