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Best practices on numbering invoices Make 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.

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.

Save Copies of Each Invoice Sent in Specific Folders One way to do this is to create folders for each of your regular clients, and one for once-off clients. Within those folders, divide the invoices up ing to years or months, depending on how often you bill them.

How to file invoices Make sure all data is correct and updated. Before you file an invoice, you probably want to make sure all the information on it is accurate and up-to-date. ... Create folders by month and year. ... Use software for tracking. ... Scan paper invoices. ... File frequently. ... Back up your files.

While it's up to you, most people would agree that the most convenient first invoice number should be '01'. Though, others prefer to add another zero, making the first number in the sequence '001'. From there, you can add unique identifiers such as customer numbers, a code for your business, or the date.

While it's up to you, most people would agree that the most convenient first invoice number should be '01'. Though, others prefer to add another zero, making the first number in the sequence '001'. From there, you can add unique identifiers such as customer numbers, a code for your business, or the date.

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.