New Delhi Municipal Council v. Association of Concerned Citizens of New Delhi & Ors.
Background
In 2009, the New Delhi Municipal Council (NDMC) replaced the old method of calculating property tax (based on the rent a property could reasonably fetch) with a new "Unit Area Method," which instead valued properties using fixed per-square-foot rates tied to location, age and use. Residents and resident associations in NDMC's area challenged these bye-laws in the Delhi High Court, arguing they exceeded what Parliament's law (which still spoke of taxing "annual rent") actually authorized NDMC to do. The High Court struck the bye-laws down as beyond NDMC's powers, and NDMC appealed to the Supreme Court.
Decision Breakdown
The Supreme Court agreed with the High Court that the Unit Area Method is not simply a way of calculating "annual rent" as required by Section 63 of the NDMC Act: it instead values property more like a tax on capital/rental value by a different formula, which NDMC's bye-law-making power did not authorize without Parliament amending the underlying Act. However, recognizing that the new method had been in use since 2009, that an interim Supreme Court order had let assessees pay tax under it in the meantime, and that about 95% of assessees had voluntarily accepted and paid under the new bye-laws, the Court used its special constitutional power (Article 142) to protect that large majority from having their past assessments reopened, while making clear that the original petitioners who had actually challenged the bye-laws would get the benefit of the High Court's ruling in their favour. The appeals were disposed of on these terms.
Lesson Learnt
A government body's power to make subordinate rules (bye-laws) is limited to what its parent statute actually permits: it cannot use bye-laws to introduce a fundamentally different method than what the law itself specifies, even if the new method is arguably better; any such change needs the legislature to amend the law itself. The case also shows the Supreme Court can tailor practical, equitable relief (protecting those who already complied) even while striking down a rule as invalid.