Correct TR-6 assessee code format required; banks will verify challans to ensure accurate excise and service tax payments. Use of the prescribed TR-6 Challan format is mandated for payment of Central Excise duty and Service Tax, and assessees must enter their correct 15-digit assessee code on the Challan; authorized banks will be provided a complete list of assessee codes to verify entries when accepting TR-6 Challans.