7.
Why charging tax in the invoice there may be confusion regarding whether IGST or CGST/SGST is applicable (depending up the place of supply) but there should be no confusion while availing credit (ITC). The buyer/ receiver of service or goods has to take credit of the kind of tax mentioned in the supplier's invoice.
If invoice shows CGST/SGST but the purchaser/receiver of service takes credit of IGST, the department may consider that such wrong ITC has been taken intentionally (may be modus operandi) in order to encash accumulated unutilized credit because of any reason. If mala fide intention is proved to this effect, such wrong credit will attract interest and penalty both.