Limited taxable value for convention services when catering is included reduces the service tax base absent Cenvat benefit. The notification limits the taxable value of convention services that include catering by exempting service tax to the extent it exceeds tax computed on a value equal to sixty per cent of the gross amount charged, where that gross amount is inclusive of catering charges. 'Catering service' means supply of a substantial and satisfying meal. The exemption does not apply if Cenvat credit on inputs or capital goods has been taken or if benefits under the 2003 Service Tax notification have been availed.