S. 37(1) : Business expenditure-Capital or revenue-Infrastructure development expenses-Agreement to maintain common facilities and amenities outside property of assessee-Allowable as revenue expenditure even though advantage may endure for indefinite time-Foreign currency fluctuation-No disallowance can be made-Miscellaneous expenses-A corporate entity and Ad hoc disallowance of expenditure is not permissible without pointing out specific defect-Legal expenses for acquisition of plant-Charges towards drafting agreements, resolutions and rendering legal consultancy services relating to plant acquisition-Professional services-Allowable as revenue expenditure. [S. 43A]