What is Single Transferable Vote (STV)?
Historical Background
Key Points
12 points- 1.
Voters using STV do not simply choose one candidate; instead, they rank candidates by marking their preferences as 1, 2, 3, and so on. This allows voters to express a more nuanced choice, indicating who they would prefer if their first choice cannot win or has already won with a surplus.
- 2.
The primary goal of STV is to achieve proportional representation. This means that the number of seats a party wins should be roughly proportionate to the percentage of votes its electors cast. It ensures that even smaller parties or groups can secure representation if they gather enough support.
- 3.
In India, STV is the prescribed method for electing members to the Rajya Sabha, the President, and the Vice-President. This choice reflects the indirect nature of these elections, where elected representatives (like MLAs for Rajya Sabha) act as the electorate.
Visual Insights
Single Transferable Vote (STV) Mechanism for Rajya Sabha Elections
A flowchart detailing the step-by-step process of the Single Transferable Vote (STV) system, as used in Rajya Sabha elections, from ranking preferences to vote distribution and quota achievement.
- 1.Voters (MLAs) Rank Candidates by Preference (1, 2, 3...)
- 2.Calculate Quota: [Total Valid Votes / (Number of Seats + 1)] + 1
- 3.Count First Preference Votes
- 4.Are any candidates elected (reached quota)?
- 5.Transfer Surplus Votes of Elected Candidates to Next Preference
- 6.Are all seats filled?
- 7.Eliminate Candidate with Fewest First Preference Votes
- 8.Transfer Eliminated Candidate's Votes to Next Preference
- 9.Declaration of Results
Recent Real-World Examples
1 examplesIllustrated in 1 real-world examples from Mar 2026 to Mar 2026
Source Topic
Understanding the Complex Process of Electing Rajya Sabha Members
Polity & GovernanceUPSC Relevance
Frequently Asked Questions
121. When calculating the quota for an STV election like Rajya Sabha, what common mathematical error do aspirants make, and what is the correct formula to remember?
Aspirants often forget the '+1' in both the denominator and the final result. The correct Droop Quota formula for STV is: [Total number of valid votes / (Number of seats to be filled + 1)] + 1. For example, if 200 MLAs are voting for 4 seats, the quota is [200 / (4+1)] + 1 = 41. Remembering both '+1's is crucial for MCQs.
Exam Tip
"Droop Quota" has two "O"s, reminding you of the two '+1's in the formula: one in the denominator and one at the end.
2. For which specific STV elections in India is the 'open ballot' system mandatory, and for which does 'secret ballot' still apply, often confusing aspirants?
The 'open ballot system' was introduced in 2003 and is mandatory only for Rajya Sabha elections, where MLAs must show their marked ballot to their party's authorized agent. For the election of the President and Vice-President, the 'secret ballot' system continues to be used, maintaining the confidentiality of the vote. This distinction is a common MCQ trap.
