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Chronological Invoice NumberingThe 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.

The only thing to remember when numbering your invoices are to ensure that they are sequential. Assigning invoice numbers chronologically allows you to easily identify every unique transaction this is especially important as your business grows and you start getting more individual clients to track payments with.

The requirements are that: Every invoice should have its own, unique invoice number (no duplicates) Invoice numbers should be sequential, with no gaps.

Sequential Invoice Numbering Sequentially creating your invoice numbers means moving up numerically by one with every new invoice. 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).

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. They also make it easier to track payments and manage overdue invoices.

Invoice numbers are unique identification numbers assigned to invoices. In the UK, there is no legal requirement for how you should format your invoice numbers.They can include numbers, letters, and special characters.

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.