You may cancel an invoice you have sent to a customer, as long as the customer has not sent you a payment for the invoice.
How to cancel an Invoice
Click the Invoices tab. Select the invoice from the list you would like to cancel.
From the right-side menu, select Cancel Invoice.
To cancel, click Yes cancel invoice. To go back to your invoice list, click No return to list.
After you cancel the Invoice, the status of the invoice will be updated to canceled.