Exemption power for mineral oil participants allows government to modify income tax treatment by notification in public interest. Clause 527 authorises the Central Government, by notification and in the public interest, to make an exemption, reduce tax rates, or otherwise modify income-tax treatment for specified classes of persons in relation to participation in the business of prospecting for, extraction or production of mineral oil, including contracting participants, service or equipment suppliers, and their employees; such notifications must be laid before each House of Parliament.