Sir read rule 3 of point of taxation rules. service tax is chargeable 1 time of issue of invoice 2 date of payment which ever is earlier. this provision apply when invoice is issued within 30 days of complition of service.
in case invoice not issued with in 30 days of complition of service than .. 1 dte of complition of service 2 date of payment which ever is earlier will b the date of service tax liability.