NOTE:
VAT Cash Accounting and UK Flat Rate VAT schemes - If the payment is more than the invoice value, account for the VAT on the overpayment. Sage posts the overpayment as a payment on account. Before you save the invoice, Sage prompts you to choose a tax code for the overpayment. Sage automatically uses the customer's default tax code, but you can select a different one from the list. Alternatively, cancel the prompt, return to the invoice, and change the payment amount to match the order value.