Specifying or modifying surcharge for invoice Use this page to specify or modify the surcharge for the invoice. Click Add on the Invoice Surcharge tab of the Invoice details page. The Surcharge page is displayed. You can use the Edit option corresponding to Amount. The Surcharge page is displayed. Specify or modify this information: Net Surcharge Amount The additional amount applicable as surcharge to the invoice amount. Comments The information related to the surcharge. Click Save.