How to change your invoice number series

Add numbers and characters to your invoice number series

It’s one of the main requirements of every invoice you create: a unique invoice number, one that falls next in your invoice number sequence. Your invoice numbers should progress sequentially without any gaps or repeats.

Thankfully, Debitoor takes care of that for you. Once you’ve decided on the right invoice number sequence for your business, you can set it up in your Debitoor account simply by typing it into the ‘Invoice No.’ field in the next new invoice you create with our ready-made invoice templates.

The invoice number is read by the system so that the next time you hit the ‘New Invoice’ button in your invoice list, the invoice number will automatically apply the next sequential number of the invoice numbers you’ve entered.

When it comes to formatting, we typically suggest thinking logically. You can start with a structure like Prefix-Year-Number and go from there. For example: ABC-2021-001. That way, the sequence is easy to reset each year if you choose to do so.

As long as your invoice numbers follow the main requirements for invoices: that each invoice has a unique invoice number, that there are no gaps in your numbering, and that there are no duplicates, you can use the numbering system that works best for your business.

Here’s how to apply your new invoice number sequence:

Short on time? Here’s a quick step-by-step recap of the video:

  1. Click on your ‘Invoices’ tab and click the blue ‘New Invoice’ button

  2. In the ‘Invoice No.’ field at the top right of the invoice template, enter the first number of your new invoice number series

  3. That’s it! The next invoice you create will automatically apply the next in the number sequence you’ve entered for your invoices

Questions or feedback? Don’t hesitate to reach out to us at

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