The accused in a trial under Section 138 of the Act has two options. He can either show that consideration and debt did not exist or that under the particular circumstances of the case the non-existence of consideration and debt is so probable that a prudent man ought to suppose that no consideration and debt existed. To rebut the statutory presumptions an accused is not expected to prove his defence beyond reasonable doubt as is expected of the complainant in a criminal trial. The accused may adduce direct evidence to prove that the note in question was not supported by consideration and that there was no debt or liability to be discharged by him. However, the court need not insist in every case that the accused should disprove the non-existence of consideration and debt by leading direct evidence because the existence of negative evidence is neither possible nor contemplated. At the same time, it is clear that bare denial of the passing of the consideration and existence of debt, apparently would not serve the purpose of the accused.
Kumar Exports v. Sharma Carpets, (2009) 2 SCC 513
see also: Uttam Ram vs. Devinder Singh Hudan and Another, (2019) 10 SCC 287