Examine the constitutional principle that legislation should not operate retrospectively to deprive citizens of vested rights, with reference to the 2026 Transgender Persons Amendment Act controversy.

Indian constitutional law presumes that an amending statute operates prospectively unless Parliament expressly says otherwise, because Articles 14 and 21 protect settled expectations from arbitrary disturbance. The Centre's August 2026 assurance to the Supreme Court that pre-amendment transgender identity cards remain valid [3] is a fresh illustration of this principle in operation.

The principle and its constitutional basis

• A vested right — one already accrued and acted upon — cannot be extinguished by a later law that is silent on retrospectivity; courts read such statutes narrowly to avoid arbitrariness under Article 14.
• Identity documents engage Article 21: the identity certificate issued by the District Magistrate under the Transgender Persons (Protection of Rights) Act, 2019 [1] is the gateway to changing name and gender in official records and to welfare access.
• NALSA v. Union of India (2014) [2] located self-identified gender within dignity and autonomy, making rights already recognised under that framework especially resistant to retrospective erasure.

Application to the 2026 controversy

• The Amendment Act, 2026 (assented 30 March 2026) removed the statutory definition of "transgender person" and interposed a medical board headed by a Chief Medical Officer to recommend certification to the DM [4].
• Petitioners contend this reintroduces medicalisation and hands the state near-unfettered power over gender identity [3].
• Crucially, the Act carried no explicit savings or transitional clause; litigation, not legislation, forced the Centre to clarify that existing cards continue to operate, subject to the pleas' outcome [3].

Limits of the principle

• Prospectivity protects only accrued rights; it does not bar Parliament from altering the future certification process, nor does it settle the amendment's substantive validity — that challenge remains pending.
• Applicants whose claims were pending at commencement occupy a grey zone the doctrine resolves imperfectly [3].

The episode shows that prospectivity is a shield for continuity, not a substitute for scrutiny of substance. Drafting practice should therefore build express savings clauses into rights-affecting amendments, sparing vulnerable groups the cost of litigating for what the Constitution already guarantees under Articles 14 and 21.