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How to create an invoice number numbering your invoices sequentially, for example, INV00001, INV00002. starting with a unique customer code, for example, XER00001. including the date at the start of your invoice number, for example, 2023-01-001. combining the customer code and date, for example, XER-2023-01-001.

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.

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.

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 the Custom transaction numbers option to set your own numbering preference. This adds an Invoice number field where you can enter any number or letter format you want. This is on by default, and includes a default numbering system.

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.

Use unique numbers Make each invoice number unique to avoid confusion. 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.