Invoice numbers are important for your accountant, as the synchronisation with accounting software is based on these numbers. By law, invoice numbers must be sequential and therefore you are not allowed to change them just like that, except, for example, at the beginning of each new fiscal year. At Teamleader One, we have come up with some solutions for this, should you need to change them anyway..

Invoice settings

In the settings of your account, you will find the Invoice settings, among other things. There you can change the invoice numbers of your next draft and final invoices. In this article, we explain the various options.

Removing the invoice number from the most recent invoice

Do you want to remove an invoice number? It's a good idea to consult your accountant before making changes to finalised invoices, especially if they have already been sent to customers or the accountant. Your accountant will likely suggest creating a credit note.

You can remove an invoice number by reopening the invoice. Only invoices that have not yet been sent or synchronised with the accountant can be reopened. To do so, click on this option:

When you reopen an invoice, the number is released as if the invoice had not been finalised. You can leave the reopened invoice as a draft or delete it. The next invoice you finalise will receive the released number, ensuring that no numbers are skipped.

Please note: You can only reopen invoices that have not yet been paid. If you have added payments already, you can easily remove them by clicking on the Payments button. You can then reopen the invoice.

Removing the invoice number from an older invoice

You can only reopen the most recent finalised invoice. If you want to adjust the number of an older invoice, it's possible, but it requires reopening all previous invoices starting from that invoice. This is only possible if that invoice has not yet been sent and the invoices created after that have not yet been sent either. When you reach the number you want to remove, you can leave that invoice as a draft. The other reopened invoices will need to be finalised again. The next invoice you process will receive the released number, ensuring that no numbers are skipped.