The Election Commission's Special Intensive Revision (SIR) of voter rolls in West Bengal led to the deletion of 90,83,345 names ahead of the 2026 assembly elections, with the BJP securing a majority of seats in constituencies that saw the highest number of deletions. The Trinamool Congress, which had governed the state for 15 years under Chief Minister Mamata Banerjee, lost power as the BJP made significant inroads, particularly in areas where over 15,000 voters were removed from electoral lists.

An NDTV review of 147 constituencies with over 25,000 combined deletions found the BJP won 95 seats, while Trinamool won 51 and Congress one. In 67 seats with 15,000–25,000 deletions, the BJP won 47; in 62 seats with 5,000–15,000 deletions, it won 50. The BJP also won all 13 seats where fewer than 5,000 voters were deleted.

The highest number of deletions occurred in Murshidabad (4.55 lakh), North 24 Parganas (3.26 lakh), and Malda (2.39 lakh). In Murshidabad, Trinamool's representation fell from 20 of 22 seats in 2021 to nine in 2026. In North 24 Parganas, its tally dropped from 28 of 33 seats to eight, while in Malda, it declined from eight to six. The remaining seats in these districts were captured by the BJP.

The SIR process, aimed at removing duplicate and ineligible voters, especially in border areas adjacent to Bangladesh, triggered political controversy, with Trinamool alleging bias and targeting of its voter base. The final voters' list, published February 28, recorded 63.66 lakh deletions, up from 58.20 lakh in the draft, with over 60 lakh cases referred for judicial adjudication.

The newly elected BJP government will take charge by early May, as election officials maintain the voter revision was routine and依法 compliant, while opposition parties demand an independent review of the SIR methodology.