For service provider portion

Expense A/C Dr

Service tax deposit A/C Dr

To Creditor A/C

For Service Receiver portion

First you have to create a service tax payable A/C and a vendor A/C in the name of govt. Then pass the following entries

At the time of booking exp.

For liability creation

1)ST payable A/C dr

To vendor a/c

At the time of payment

For payment

2) vendor a/c dr

To bank a/c

For availment of credit

3) ST deposit a/c dr

To ST payable a/c

(OR) otherwise pass manual entry

ST deposit a/c dr

To bank a/c

Note: st deposit a/c is Input credit a/c