As per Section 2(56) of MGL, ISD means an office of the supplier of goods and / or services which receives tax invoices issued under section 23 towards receipt of input services and issues tax invoice or such other document as prescribed for the purposes of distributing the credit of CGST (SGST in State Acts) and / or IGST paid on the said services to a supplier of taxable goods and / or services having same PAN as that of the office referred to above. For the purpose of distributing the credit, ISD is deemed as supplier of services.