Availability of Service Tax INput Credit on INterest charged

Service tax paid on input services which used for providing the output services is available.

Yes. Banking service is an input service. You are eligible for credit.

If the bank has not charged the service tax separately, but it has debited account by an amount which is inclusive if service tax, then we can take credit on the amount or not

Seek details of service tax charged from the bank, and take credit of that amount.