I have a customer who has overpaid on an invoice - how do I enter this as a payment on account so it will reduce the amount owed next month?

Hi dpjyates Did the customer pay the overpayment and amount due on the invoice as one amount or two separate amounts? If it was one amount select receive payment on the invoice and in the amount received field enter the amount that was actually received. This will create a credit on the customers account and when you receive payment on another invoice for the dame customer you'll be able to select the credit/unapplied payment and use it towards payment of the invoice.