The Presumption under Section 20 and Ordinary Evidentiary Presumptions

The law of evidence recognises three kinds of presumption: those a court may draw, those it must draw unless the contrary is proved, and those which admit of no contrary proof at all. Section 20 belongs to the second category. It is a mandatory but rebuttable presumption of law, operating on a foundational fact which the prosecution must first establish, and displaced by the accused on the preponderance of probabilities. Placing it correctly in that taxonomy disposes of most of the arguments made about it.

1. The Three Categories

Category	What it means	Examples
May presume	The court has a discretion; it may regard the fact as proved unless disproved, or may call for proof of it. This is a presumption of fact, drawn from ordinary human experience	The inference from possession of recently stolen goods that the possessor is the thief or the receiver; the general power to presume the existence of facts likely to have happened
Shall presume	The court must regard the fact as proved unless and until it is disproved. This is a presumption of law, and it is rebuttable	Section 20 of this Act; the presumption in dowry death cases; the presumption as to consideration on a negotiable instrument; the presumption of culpable mental state in the narcotics legislation
Conclusive proof	The court must regard the fact as proved and no evidence is permitted to disprove it	Rare, and confined to matters of status and legitimacy; there is nothing of this kind in this Act

2. Where Section 20 Sits

It is mandatory. The words are shall be presumed, so once the foundational fact is proved the court has no discretion, subject only to the discretion in sub-section (3) where the advantage is trivial.
It is rebuttable. The words unless the contrary is proved make it so, and the burden is discharged on the preponderance of probabilities.
It operates on a fact in issue that is peculiarly within the accused's knowledge, namely the purpose for which he accepted, which is the standard justification for a reverse burden.
It requires a foundational fact. This distinguishes it from a presumption of fact, which a court may draw from any material it finds persuasive. Here nothing arises until acceptance of an undue advantage is proved.

⚠ The presumption and the inference of fact are different things

Even where Section 20 is unavailable, because acceptance has not been proved or the offence charged is not one to which the section applies, the court is not helpless. It may still draw an ordinary inference of fact from the evidence, in the exercise of the general power to presume the existence of facts likely to have happened. That is what the Constitution Bench did in substance in Neeraj Dutta v. State (NCT of Delhi), (2023) 4 SCC 731 when it held that demand and acceptance may be established by circumstantial evidence. The distinction matters: the statutory presumption compels a conclusion once a fact is proved, while an inference of fact is drawn only if the material makes it the only reasonable one.

3. Compared with Other Statutory Presumptions

Dowry death. The presumption arises on proof that the death occurred within seven years of marriage and was preceded by cruelty or harassment in connection with a demand for dowry; like Section 20, it is mandatory and rebuttable, and requires foundational facts.
Negotiable instruments. The presumption that a cheque was issued for consideration and in discharge of a debt arises on proof of the signature and issue, and is rebutted on the preponderance of probabilities; the structure is the same as Section 20 and the case law on the standard of rebuttal is frequently cited across the two.
Narcotics legislation. The presumption of culpable mental state, and the presumption from possession, are stronger because the statute requires the accused to prove the absence of mental state and the courts have held that the standard is higher there than the ordinary civil standard.
Section 13(1)(b) of this Act. Not strictly comparable, because the inability to account satisfactorily is an ingredient of the offence rather than a presumption operating on a separate fact, though the Explanation is framed in the language of presumption.

4. Why Reverse Burdens Are Upheld

A provision of this kind is tested by three questions: whether the prosecution must establish foundational facts before it operates, whether the fact presumed is one within the special knowledge of the accused, and whether the burden cast on him is proportionate, being the lighter civil standard rather than proof beyond reasonable doubt. Section 20 satisfies all three. The corrupt purpose exists only in the mind of the recipient, the transaction is private, and requiring the prosecution to prove the purpose by ordinary evidence would make the offence practically unprovable while leaving the accused free to explain if an innocent explanation exists.

5. Related Topics and Provisions

Topic or provision	Connection
The Statutory Presumption: Section 20	The provision in full
The Act and the Presumption of Innocence	The constitutional test applied to reverse burdens
Demand and Acceptance Compared	The foundational facts
Sections 13(1)(b) and 20, Prevention of Corruption Act, 1988	The two burdens in the Act
Bharatiya Sakshya Adhiniyam, 2023	The general law of presumptions