The billed amount takes into account any discounts or surcharges before taxes are applied. Discounts are distributed proportionately among the billed entries. For example, if the total billed is $500 and you enter a discount of $50, then each entry’s taxable billed amount is decreased by 10%. Surcharges are also applied proportionately to the taxable billed amount if the surcharge is a fixed amount. However, if the surcharge is based on the activity, then tax is applied at the entry level depending on whether or not the activity is taxable.