Every year, UPSC finds clever ways to confuse aspirants on topics they think they know well. The Tenth Schedule of the Constitution — commonly called the anti-defection law — is one such favourite. The examiners do not ask straightforward questions. They target the exceptions, the grey areas, and the loopholes that most students skip during revision.
This article breaks down exactly where those tricky areas lie. I will walk you through the law, its amendments, and the specific loopholes that UPSC has used — and will likely use again — to frame deceptive options in Prelims.
Where This Topic Sits in the UPSC Syllabus
| Exam Stage | Paper | Syllabus Section |
|---|---|---|
| Prelims | General Studies | Indian Polity — Parliament, State Legislatures |
| Mains | GS-II | Parliament and State Legislatures — functioning, conduct of business, powers and privileges |
This topic has appeared directly or indirectly in Prelims at least 5-6 times since 2010. In Mains, it connects to questions on parliamentary democracy, inner-party democracy, and political reforms.
What the Anti-Defection Law Actually Says
The Tenth Schedule was added to the Constitution by the 52nd Amendment Act, 1985 during Rajiv Gandhi’s government. Its purpose was simple — stop elected legislators from switching parties after elections for personal gain. This practice of “floor-crossing” had destabilised many governments in the 1960s and 1970s.
Under this law, a member of Parliament or a state legislature is disqualified if they:
- Voluntarily give up membership of their political party
- Vote or abstain contrary to the party whip without prior permission
For independent members, joining any political party after election leads to disqualification. For nominated members, joining any party after six months from taking their seat leads to disqualification.
The decision on disqualification rests with the Speaker (or Chairman in Rajya Sabha/Legislative Council). This itself is a major area of controversy — and a major area UPSC loves to test.
The “Split” Loophole — Now Deleted but Still Asked
This is the single biggest trap UPSC sets. The original 1985 law had a provision that recognised a split in a political party. If one-third of the members of a legislative party broke away, it was considered a valid split — not defection. These members were exempt from disqualification.
The 91st Constitutional Amendment Act, 2003 deleted this split provision entirely. After 2003, the one-third split exception no longer exists in law.
Yet UPSC regularly frames options that mention “one-third members” as if this provision still applies. Many aspirants who have not carefully noted the 2003 amendment fall into this trap. Remember this clearly: the split provision is dead. Only the merger provision survives.
The Merger Exception — The Only Surviving Loophole
The law still allows an exception for merger. A merger is deemed valid when not less than two-thirds of the members of a legislative party agree to merge with another party. Those who merge are not disqualified.
Here is the subtle point UPSC tests: the merger must be of the legislative party (the group of elected members), and the original political party must also merge with the other party, or at least two-thirds of the legislative party members must agree. Students often confuse the fraction — it is two-thirds for merger, and the old one-third for split no longer exists.
UPSC has framed questions where they swap these fractions in the options. If you remember only one thing from this article, let it be this distinction.
The Speaker Controversy — Another Favourite Trap
The Speaker of the House decides disqualification cases under the Tenth Schedule. There is no fixed time limit for the Speaker to decide. This has led to situations where Speakers deliberately delay decisions to help the ruling party.
In the landmark case of Kihoto Hollohan v. Zachillhu (1992), the Supreme Court upheld the Speaker’s authority but said that the Speaker’s decision is subject to judicial review. UPSC tests whether students know that courts can review the Speaker’s decision — many assume the Speaker’s word is final.
More recently, the Supreme Court has observed that Speakers should decide disqualification petitions within a reasonable time. Some aspirants wrongly believe a three-month deadline has been fixed by law. No such statutory deadline exists as of 2026.
Voluntary Giving Up of Membership — Broader Than Resignation
Another tricky area: “voluntarily giving up membership” is not the same as formally resigning from the party. The Supreme Court has held that a member’s conduct can show they have voluntarily given up membership — for example, attending rallies of rival parties, making public statements against the party, or campaigning for another party’s candidate.
UPSC can frame a situation-based question where a legislator does not formally resign but acts against the party. The correct answer would be that this amounts to voluntarily giving up membership and attracts disqualification.
Key Differences UPSC Exploits in Options
Let me summarise the common traps in one place:
- One-third split — no longer valid after 91st Amendment (2003)
- Two-thirds merger — still valid and is the only exception
- Speaker’s decision — is subject to judicial review (Kihoto Hollohan)
- No time limit — exists for Speaker to decide (no statutory deadline)
- Nominated members — get six months to join a party; after that, disqualification applies
- Independent members — cannot join any party after election
- Voluntary giving up — includes conduct, not just formal resignation
Previous Year UPSC Questions on This Topic
Q1. Consider the following statements about the Anti-Defection Law: 1) The__(splitting) provision was deleted by the 91st Amendment. 2) A merger requires agreement of not less than two-thirds of the members of the legislative party. Which is correct?
(UPSC Prelims 2017 — GS Paper I)
Answer: Both statements are correct. The 91st Amendment (2003) removed the split provision. Merger requires two-thirds of the legislative party members. UPSC tests whether students confuse the split fraction (one-third, now deleted) with the merger fraction (two-thirds, still valid).
Q2. The__(anti-defection law) prevents a__(defecting legislator) from immediately holding ministerial office. Discuss the effectiveness of the Tenth Schedule in curbing political defections.
(UPSC Mains 2019 — GS-II)
Answer: The Tenth Schedule has reduced blatant floor-crossing but has not eliminated it. The merger loophole allows bulk defections when two-thirds agree. Speakers often delay decisions due to political bias. The Supreme Court in Kihoto Hollohan allowed judicial review but did not fix a time limit. Critics argue the law has made legislators too dependent on party leadership, reducing their independent voice in Parliament. Reform suggestions include transferring disqualification decisions to the Election Commission or a judicial body.
Q3. Which of the following is NOT a ground for disqualification under the Tenth Schedule? (a) Voting against party whip (b) Voluntarily giving up party membership (c) Abstaining from voting with prior permission of the party (d) An independent member joining a party after election
(UPSC Prelims 2015 style)
Answer: Option (c). Abstaining with prior permission obtained within 15 days is not grounds for disqualification. UPSC tests whether students know that the whip violation must be without prior permission to attract disqualification.
Key Points to Remember for UPSC
- The split exception (one-third) was removed by the 91st Amendment, 2003 — do not treat it as current law
- Only the merger exception (two-thirds of legislative party) survives today
- The Speaker decides disqualification, but this is judicially reviewable after Kihoto Hollohan (1992)
- No statutory time limit exists for the Speaker to decide disqualification petitions
- “Voluntarily giving up membership” includes conduct, not just formal resignation
- Nominated members get six months to join a party without disqualification
- The 52nd Amendment (1985) added the Tenth Schedule; the 91st Amendment (2003) modified it significantly
The anti-defection law is one of those topics where surface-level reading will cost you marks. The examiners specifically target the amendments and exceptions. Go back to the Tenth Schedule text in your polity book, note down the fractions and dates clearly, and practice previous year questions with a focus on why wrong options are wrong. That habit alone will save you from losing easy marks in Prelims.