Service tax liability for delay in payment

Dear Sir/Madam,

Pls. advise the maximum liability of my Service Tax including penal provisions (i.e. Interest and penalty if any), the details of which are given below ;

Date of Invoice for raising Invoice for Commission : 20.01.2012

Amount of Service Tax  Rs.4560/-

Payment has not been made till date and the amount of Service Tax had not been reflected in Return submitted for Mar'12.