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Timeline: Assessing SIR's impact on West Bengal and the 2026 election results
This timeline tracks the Special Intensive Revision (SIR) context in West Bengal, historical assembly-constituency dynamics, and the 2026 election results. It consolidates delimited boundaries, past AC tallies, SIR-related deletions, and the latest vote shares to assess whether SIR alone decided the outcome for BJP.
Why It Matters
The timeline highlights how electoral roll revisions interact with historical constituency patterns and current voting results, informing debates on electoral integrity and the potential lasting impact of SIR on future elections.
Timeline
11 Events
May 5, 2026: West Bengal AC landscape and BJP expansion
May 5, 2026
Historical AC counts show the TMC held 124 stronghold ACs in 2011, 2016 and 2021; in 2026 the TMC lost 78 of these 124 strongholds and won 34 outside the group. The BJP retained all 54 ACs it had won in 2019, 2021 and 2024 and added 65 new ACs.
May 5, 2026: Election results — BJP 45.8%, TMC 41.1% (as of 10pm); vote changes and deletions
May 5, 2026
As of 10pm on election night, the BJP led with 45.8% of the vote and the TMC had 41.1%. The BJP gained 7.1 percentage points from 2024, while the TMC fell by 4.7 points. BJP polled 5.6 million more votes; the TMC 1.7 million fewer votes compared with 2024. Net SIR deletions stood at 8.9 million, including 2.7 million in adjudication.
2026: Six states/UTs held elections after SIR, including West Bengal
2026
Six states/UTs had elections after the SIR, among them West Bengal.
2025: Special Intensive Revision (SIR) conducted in 14 states/UTs; Bengal deletions include 2.7 million adjudication and 6.2 million deleted in SIR (net 8.9 million)
2025
The article notes SIR/SR was conducted across 14 states/UTs since last year; in West Bengal, 2.7 million electors were removed under adjudication and 6.2 million were deleted in SIR beyond adjudication, totaling 8.9 million deletions.
2024: BJP won 90 assembly constituencies
2024
In the 2024 elections, the BJP won 90 ACs.
2021: BJP won 77 assembly constituencies
2021
In the 2021 elections, the BJP won 77 ACs.
2021: TMC and allies won 215 assembly constituencies
2021
In the 2021 West Bengal assembly elections, the TMC and allies won 215 ACs.
2019: BJP won 121 assembly constituencies
2019
In the 2019 elections, the BJP won 121 ACs.
2016: TMC and allies won 211 assembly constituencies
2016
In the 2016 West Bengal assembly elections, the TMC and allies won 211 ACs.
2011: TMC and allies won 226 assembly constituencies
2011
In the 2011 West Bengal assembly elections, the TMC and allies won 226 ACs.
2008 delimitation changes West Bengal assembly constituencies
2008
The article notes that boundaries were changed in the 2008 delimitation, making pre-2011 comparisons difficult.