Service tax entry on provision booked

Pushpak Lal (Student CA Final ) (286 Points)

07 June 2016  
Suppose, i am a service recipient and i pay service tax on reverse charge basis on security expense. On 31st March, i have made a provision entry for march month security expense entry. I have received the bill on 13th April and reversed the provision and recorded this bill. When do i have to book the service tax entry ? And when do i have to make the payment on it?