At times, you might have to write-off all or part of an invoice because of non-payment or any other reason. If you know that the payment on an invoice will not be made, you can write off that amount due. It reduces the outstanding balance on invoices and applies to payments as an irrecoverable amount. You can write-off invoices and bad-debts from the Payments screen by selecting Write-off as the Payment Method and then applying that 'payment' to the relevant invoice. Check CORE Help Center for details.