This principle is an addition to the doctrine of Pith and Substance. What it means is that the power to legislate on a subject also includes power to legislate on ancillary matters that are reasonably connected to that subject. It is not always sufficient to determine the constitutionality of an act by just looking at the pith and substance of the act. In such cases, it has to be seen whether the matter referred in the act is essential to give effect to the main subject of the act. For example, power to impose tax would include the power to search and seizure to prevent the evasion of that tax. Similarly, the power to legislate on Land reforms includes the power to legislate on mortgage of the land. However, power relating to banking cannot be extended to include power relating to non-banking entities. However, if a subject is explicitly mentioned in a State or Union list, it cannot be said to be an ancillary matter. For example, power to tax is mentioned in specific entries in the lists and so the power to tax cannot be claimed as ancillary to the power relating to any other entry of the lists.
As held in the case of State of Rajasthan v. G Chawla, the power to legislate on a topic includes the power to legislate on an ancillary matter which can be said to be reasonably included in the topic. The underlying idea behind this principle is that the grant of power includes everything necessary to exercise that power. However, this does not mean that the scope of the power can be extended to any unreasonable extent. Supreme Court has consistently cautioned against such extended construction. For example, in R M D Charbaugwala v. State of Mysore, SC held that betting and gambling is a state subject as mentioned in Entry 34 of State list but it does not include power to impose taxes on betting and gambling because it exists as a separate item as Entry 62 in the same list.
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