If you've accidentally created an invoice or need to delete an invoice for any reason, you can use the method below to delete it:
Deleting an Invoice
Click on "Billing" and then click on "Invoices.
Click on the "View" icon next to the invoice you'd like to delete.
Click on "Invoice Options" at the top-right and then click the "Delete" option.
NOTE: Only invoices that don't have a credit note or payment allocated to it can be deleted. If you want to delete an invoice that has been marked as "Paid", you should use the "Void" option in the Invoice Options menu instead. You can find more information about voiding invoices here: Voiding Invoices.
You can also delete invoices with the status "Saved" in bulk using the method in this article: Deleting Saved Invoices in Bulk.