An invoice number is a unique identifier, and it is used by businesses.  It is a combination of letters, numbers, or both, and it helps the user to track the invoice.

For example, INV-0001, INV-0002, and so on are the sample invoice formats. Businesses use an invoice number to search the transactions.

How to Create an Invoice Number?

Sequential Numbering: For example, 00012,00013.

 Alphanumeric: Combination of letters and numbers (example: INV-123, INV124).

Client-based: The client code should be added to the start of the number (example: Client-002).

Create an invoice using an online invoice generator