IGST on imports requires declaration of GSTIN or PAN and EDI validation for input tax credit claims. Integrated goods and services tax and compensation cess will be levied on imports in addition to customs duties, with valuation rules requiring inclusion of customs duties for calculating IGST and cess. Bills of Entry and Shipping Bills have been modified to capture GSTIN, PAN and state code so Customs EDI can validate IGST credit claims and export refund claims against GSTN returns; importers claiming IGST credit must declare GSTIN or, if unregistered, PAN and state code.