Sourabh Katiyar (-) 26 May 2014
no you dont need to charge the service tax on Invoice as it is the export of Service hence no Service Tax.
Arun Kumar Singh (GST Advocate) 26 May 2014
Services are provided by you outside india then no need to pay service tax. If services provided in India (taxable tarritory) then you need to pay service tax under reverse charge system.