Meant to protect free speech from anti-defection law, ‘merger’ is now a defence for joining a rival party

A recent constitutional controversy has brought fresh scrutiny to Paragraph 4 of the Tenth Schedule — the "merger" exception to the anti-defection law — as l...

What Happened

A recent constitutional controversy has brought fresh scrutiny to Paragraph 4 of the Tenth Schedule — the "merger" exception to the anti-defection law — as legislators have invoked it to justify joining rival parties.
The provision, originally designed to protect genuine party realignments from being penalised as individual defections, is now being used as a legal shield when groups of legislators move to another party while their original party continues to exist independently.
A formal merger under the Tenth Schedule requires that the "original political party" — not just its legislative wing — merges with another party; legislators citing only legislative-wing mergers have attracted constitutional challenges.
The controversy has reignited a long-standing academic and parliamentary debate on whether the merger exception creates a constitutionally sanctioned loophole and whether the 52nd Amendment's original intent is being subverted.

Static Topic Bridges

The Tenth Schedule and the Anti-Defection Law (52nd Amendment, 1985)

The Tenth Schedule was inserted into the Constitution by the Constitution (52nd Amendment) Act, 1985, popularly known as the Anti-Defection Law. It was enacted against the backdrop of widespread floor-crossing, horse-trading, and political instability in the 1970s and 1980s, when elected legislators frequently switched parties for personal or material gain, destabilising governments.

Applicable to members of Parliament and state legislatures.
Disqualification under Paragraph 2: A member is disqualified if they voluntarily give up membership of their political party or vote/abstain against the party whip without prior party permission.
Decision-making authority: The Speaker (Lok Sabha/state assemblies) or the Chairman (Rajya Sabha) decides disqualification petitions — a provision itself contested for its lack of independence.
Original Schedule (1985) had two exceptions: the "split" exception (one-third of legislators) and the "merger" exception.
The "split" exception (Paragraph 3) was removed by the Constitution (91st Amendment) Act, 2003, after being widely exploited to engineer mass defections.

Connection to this news: The current debate centres on the surviving "merger" exception. With the split provision abolished, the merger clause is the only remaining constitutional exit from anti-defection consequences, making its interpretation critically important.

Paragraph 4 — The Merger Exception: Text, Intent, and Conditions

Paragraph 4 of the Tenth Schedule provides that a member is not disqualified if their "original political party" merges with another party and either the member votes in accordance with the merger or, if the member does not accept the merger, they form or join a separate group.

A "merger" is constitutionally valid only if at least two-thirds of the members of the legislature party concerned agree to it.
Crucially, the merger must be of the "original political party" — meaning the party organisation itself must formally merge, not merely the legislative wing of members in Parliament or a state legislature.
The term "original political party" is defined in Paragraph 1(b) of the Tenth Schedule as the political party to which the member belonged when they were elected.
This distinction between "political party" and "legislature party" is the crux of current disputes.

Connection to this news: In recent instances, legislators have claimed the merger exception based on a two-thirds majority of the legislative group joining another party — without the parent party organisationally merging. Constitutional scholars argue this misreads Paragraph 4, which requires the merger of the party itself, not merely its legislative faction.

The 91st Amendment (2003) — Closing the Split Loophole

The Constitution (91st Amendment) Act, 2003, amended both the Constitution and the Representation of the People Act. It deleted Paragraph 3 of the Tenth Schedule, which had allowed one-third of a legislature party to split without disqualification — a threshold widely used to legitimise politically motivated defections.

Pre-2003: One-third of party legislators splitting was exempt from disqualification as a "split."
Post-2003: Only a full party merger (under Paragraph 4) qualifies as an exception; no split provision exists.
The amendment also capped the size of Council of Ministers at 15% of the total strength of the House (Article 91A), addressing inducements for defection through ministerial berths.
The amendment was a response to sustained criticism — including from the Law Commission (170th Report, 1999) — that the split provision defeated the law's purpose.

Connection to this news: With the split provision removed, the merger clause has gained disproportionate importance. Its current contested use — to allow legislative-wing "mergers" without actual party mergers — is viewed by critics as recreating, through a different legal route, the very instability the 91st Amendment sought to eliminate.

Kihoto Hollohan v. Zachillhu (1992) — Supreme Court on the Tenth Schedule

In Kihoto Hollohan v. Zachillhu and Others (1992), a five-judge Constitution Bench of the Supreme Court upheld the constitutional validity of the Tenth Schedule, rejecting the argument that the Speaker's adjudicatory role violated judicial review.

The Court held that the Schedule does not violate the basic structure of the Constitution (including separation of powers or democratic principles).
It ruled that the Speaker's/Chairman's decisions are subject to judicial review, but only after the decision is made — not through interim intervention.
The Court emphasised that anti-defection law serves the public interest by promoting political stability and government continuity.
Importantly, the Court recognised the risk of Speaker bias but stopped short of transferring jurisdiction to courts or tribunals.

Connection to this news: The Kihoto Hollohan ruling established that adjudication of disqualification petitions remains with the Presiding Officer of the House. In current merger disputes, this means the Rajya Sabha Chairman or the relevant Speaker will ultimately decide validity — a decision itself often delayed, adding to the criticism of the regime's enforceability.

Key Facts & Data

Anti-defection law enacted via the Constitution (52nd Amendment) Act, 1985 — inserted as the Tenth Schedule.
Original exceptions: "Split" (Paragraph 3, one-third threshold) and "Merger" (Paragraph 4, two-thirds threshold).
Split exception removed by the Constitution (91st Amendment) Act, 2003.
Merger exception (Paragraph 4): Valid only when the "original political party" merges — not merely the legislature party.
Two-thirds threshold for a valid merger under Paragraph 4 of the Tenth Schedule.
Adjudication authority: Speaker (Lok Sabha/assemblies) or Chairman (Rajya Sabha).
Key case: Kihoto Hollohan v. Zachillhu (1992) — Supreme Court upheld constitutional validity of the Tenth Schedule.
The 170th Report of the Law Commission (1999) had recommended abolition of both split and merger exceptions.
Articles 102(2) and 191(2) of the Constitution read with the Tenth Schedule govern disqualification for defection of MPs and MLAs respectively.