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You can use a sequential, alphanumeric, or even client name/project system to assign invoice numbers, but the most important thing is to make sure the numbering is unique. That said, creating unique numbers for invoices should not be tedious when using accounting or invoicing software as it automates the process.

Use unique numbers Duplicate invoice numbers may get misfiled, discarded or processed multiple times. For example, if you start your invoice numbering with 0001, avoid starting over with the same number the following month or year.

Use a random number generator You can use online tools, apps, or formulas to generate random numbers for your invoices. However, you should also keep a record of your invoices and their numbers, so you can verify and reference them later.

A proper invoice should include: The date. An invoice number. Vendor contact name, company name, address, phone number, and email. Client contact name, company name, address, phone number, and email. Purchase order number. A description of products or services, including prices and quantities.

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.

If you own or are a partner for more than one business, you may invoice yourself for services rendered. For example, your construction business contracts work from your house painting business ? now you need an invoice to document the transaction and keep track of payments.

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.