Rulemaking authority under Interest-tax Act permits retrospective rules and subjects new rules to parliamentary modification or annulment. Section 27 empowers the Board, subject to Central Government control, to make rules by notification in the Official Gazette for carrying out the Act, including forms and verification of returns and appeals, procedures for rectification and refunds, and other prescribed matters. On first exercise the power may confer retrospective effect from commencement. Every rule must be laid before both Houses of Parliament and may be modified or annulled by parliamentary agreement without affecting prior validity of actions under the rule.