We have been registered with effect from 1st October 2014, under the Service Tax, but the service pertains to AY 2011-12, (though the service was provided during the period after registration).
The invoice is dated 6-Feb-2015. Can I avail the service tax cenvat credit
 Cenvat Credit Denied for Service Due to Timing Issues Under Rule 4A, Service Tax Rules 1994, and Six-Month Limit. A user inquired about availing Cenvat credit for a service provided after registration under Service Tax in October 2014, with the service pertaining to the financial year 2011-12 and an invoice dated February 6, 2015. One response indicated that the credit could not be claimed due to the service's date and the invoice timing violating Rule 4A of the Service Tax Rules, 1994, and the six-month limit. Another response suggested notifying the service tax range office to potentially avail the input Cenvat credit. (AI Summary)