Service tax provision at year end

Dear all,

Do we need to provide Service Tax along with the charges for taxable services at the fin. year end even if the bill is not received?

i.e.

Which is the correct entry for creating provision?

1.

Professional Charges(Dr)               100.00

Service Tax (Dr)                                     12.36

    To Provision for Expenses (Cr)                 112.36

Or

2.

Professional Charges (Dr)                100

      To Provision for Exp (Cr.)                        100

Further,

If Service Tax is booked on provisional basis (As per eg.1), can we take input Credit for the same in this Fin. year itself?

Please Help.