Every person who procures a marriage of himself or herself to be solemnized under this Act in contravention of the conditions specified in clauses (iii), (iv),and (v) of section 5
shall be punishable—
in the case of a contravention of the condition specified in clause (iii) of section 5, with rigorous imprisonment which may extend to two years or with fine which may extend to one lakh rupees, or with both.
in the case of a contravention of the condition specified in clause (iv) or clause (v) of section 5, with simple imprisonment which may extend to one month, or with fine which may extend to one thousand rupees, or with both.
Legal Commentary & Landmark Judgments: Section 18
Section 18 prescribes statutory penalties and criminal punishments for contravening mandatory conditions of a Hindu marriage specified under Section 5, covering bigamy, underage marriage, and incestuous unions.
In bigamy prosecutions, the complainant must adduce cogent proof of the actual performance of essential ceremonies for both marriages. In defence, examine whether the customary rites were completely solemnized and whether the first marriage was legally subsisting on the date of the second ceremony.