Zoho Invoice allows you to delete an invoice easily in just two steps. Please follow the below steps to delete invoices in the open and draft status only. The below steps are not applicable for a closed invoice.
You can only delete a closed invoice as long as there are no Payments or open Credit Notes associated with it. So make sure that you delete the payments or open credit notes first and then proceed with the invoice deletion.
To delete an invoice:
To delete a payment:
Similarly, delete the open credit note, and then continue deleting the closed invoice.
Zoho Invoice FAQ