Accounts will have agreed periods in which a balance on an account is due to be paid. Some systems can introduce a discount for balances that are paid on accounts if the payment is received early.
Shopfront will apply this early settlement discount if it is configured. If the order is placed on account then the decision on whether to honour this discount or not can be done in the usual manner. If this customer pays immediately by credit card then the discount will be applied. Shopfront’s handling of early settlement discounts complies with HMRC rules.