The documents if not duly stamped, shall not be admissible as evidence in the court of law. As per the provision of Indian Stamp Act, 1899, any person who, with the intention to evade the Stamp duty, executes or signs any instruments chargeable with stamp duty, without the same being duly stamped, shall on conviction, be punished with rigorous imprisonment for term which shall not be less than one month but which may be extended up to six months and fine up to Rupees Five Thousand.