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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.

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.

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.

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.

The first number in this identifier is the date, followed by the customer number, and the unique sequence number. The last number is important if you have multiple invoices for the same customer on the same date in that case, the next invoice would be numbered 05232017-4602-01.

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. However, it is required that your invoice numbers follow a sequence and do not include any repeats or gaps.

Since they are not legally binding documents, an invoice number should not be included. It is, however, important to distinguish between invoices and proforma invoices by including a Proforma or Invoice title.