As to what is ratio decidendi has been succinctly observed by Supreme Court in the case of Union of India and others vs. Dhanwanti Devi and others(1996) 6 SCC 44), which is as under:
“9. …… It is not everything said by a Judge while giving judgment that constitutes a precedent. The only thing in a Judge’s decision binding a party is the principle upon which the case is decided and for this reason it is important to analyse a decision and isolate from it the ratio decidendi. According to the well settled theory of precedents, every decision contains three basic postulates-(i) findings of material facts, direct and inferential. An inferential finding of facts is the inference which the Judge draws from the direct, or perceptible facts; (ii) statements of the principles of law applicable to the legal problems disclosed by the facts; and (iii) judgment based on the combined effect of the above.
A decision is only an authority for what it actually decides. What is of the essence in a decision is its ratio and not every observation found therein nor what logically follows from the various observations made in the judgment. Every judgment must be read as applicable to the particular facts proved, or assumed to be proved, since the generality of the expressions which may be found there is not intended to be exposition of the whole law, but governed and qualified by the particular facts of the case in which such expressions are to be found. It would, therefore, be not profitable to extract a sentence here and there from the judgment and to build upon it because the essence of the decision is its ratio and not every observation found therein.
The enunciation of the reason or principle on which a question before a court has been decided is alone binding as a precedent. The concrete decision alone is binding between the parties to it, but it is the abstract ratio decidendi, ascertained on a consideration of the judgment in relation to the subjectmatter of the decision, which alone has the force of law and which, when it is clear what it was, is binding. It is only the principle laid down in the judgment that is binding law under Article 141 of the Constitution.
A deliberate judicial decision arrived at after hearing an argument on a question which arises in the case or is put in issue may constitute a precedent, no matter for what reason, and the precedent by long recognition may mature into rule of stare decisis. It is the rule deductible from the application of law to the facts and circumstances of the case which constitutes its ratio decidendi.”
It will also be apposite to refer to the following observations of this Court in the case of The Regional Manager and another vs. Pawan Kumar Dubey (1976) 3 SCC 334:
“7. …. Even where there appears to be some conflict, it would, we think, vanish when the ratio decidendi of each case is correctly understood. It is the rule deducible from the application of law to the facts and circumstances of a case which constitutes its ratio decidendi and not some conclusion based upon facts which may appear to be similar. One additional or different fact can make a world of difference between conclusions in two cases even when the same principles are applied in each case to similar facts.”
It could thus be seen that one additional or different fact can make a world of difference between conclusions in two cases even when the same principles are applied in each case to similar facts.