If you are a business owner or accountant, you may need to void an invoice in QuickBooks Online if you have made a mistake in creating the invoice or if the customer has requested a cancellation. Voiding an invoice in QuickBooks Online will ensure that the invoice is removed from the customer's account and that the customer is not charged for the invoice. Knowing how to void an invoice in QuickBooks Online can help you keep your accounting records accurate and up-to-date.