West Bengal Elections 2026: A Look Back At 2021 Opinion Polls Vs Exit Polls Vs Actual Results

The 2021 West Bengal election delivered a large Trinamool Congress majority, overturning expectations from many polls. Final seat tally, vote share, and the divergence between predicted and actual outcomes offer insights for future campaigns and polling accuracy in the state.

The 2021 West Bengal Assembly election ended with a sweeping win for the Trinamool Congress, overturning many expectations of a neck-and-neck race. Mamata Banerjee’s party secured a third straight term with a large seat lead over the Bharatiya Janata Party, which finished as the main opposition but stayed far from a majority in the 294-member House.

The gap between pre-election and post-poll narratives and the final outcome has drawn fresh attention as parties prepare for the 2026 West Bengal Assembly elections. Surveys often caught the direction of the contest, placing the Trinamool Congress ahead, yet several polls still pointed to a possible BJP upset or a very narrow finish, which did not match the actual verdict.

2021 West Bengal election results and seat distribution

Counting on 2 May 2021 showed that the election was not the cliff-hanger many projections had suggested. Out of 292 seats declared that day, the Trinamool Congress won 213, while the BJP secured 77. The Indian Secular Front won 1 seat and an Independent took 1, establishing the BJP as opposition but leaving a wide gap with the ruling party.

The full House result became clear only after voting in Jangipur and Samserganj, where polling was delayed because candidates died before voting. When elections were finally held in these two constituencies, both seats went to the Trinamool Congress. This raised the party’s total from 213 to 215 in the 294-member Assembly, while the BJP remained at 77, and the ISF and Independent retained 1 seat each.

2021 West Bengal election vote share and party performance

Alongside the seat margin, the statewide vote share also underlined the scale of the Trinamool Congress victory. The TMC-led alliance received 48.02% of the valid vote, while the BJP-led National Democratic Alliance polled 38.15%. Despite becoming the principal opposition, the BJP’s vote share translated into far fewer seats than many predictions had indicated before and immediately after polling.

The contrast between votes and seats highlighted how many surveys misread the scale, rather than the direction, of the mandate. Most pollsters, both before and after voting, acknowledged the Trinamool Congress as a major contender. However, only a handful came close to anticipating a lead of more than 120 seats between the TMC and the BJP across West Bengal.

2021 West Bengal election opinion polls and projected outcomes

Months and weeks before voting, several opinion polls suggested the Trinamool Congress held an advantage, though estimates of the margin varied widely. A number of surveys showed the TMC comfortably ahead, but a few prominent exercises projected that the BJP could either draw level or even overtake the ruling party, raising talk of a possible change of government in the state.

Opinion poll figures for the 2021 West Bengal election showed a broad but uneven pattern. Many agencies clubbed parties into alliances: TMC+, BJP+, and the Left-Congress-ISF combine, with some also listing “Others.” Key pre-poll estimates are summarised below.

Looking across these pre-poll surveys for the 2021 West Bengal election, three broad ideas stood out. Many mainstream agencies placed the Trinamool Congress in front. A smaller group of high-visibility polls instead gave the BJP a clear lead. Several others suggested a fiercely contested or nearly hung Assembly, reinforcing the sense of a closely fought battle.

2021 West Bengal election exit polls and projected margins

After the final phase of voting ended, exit polls for the 2021 West Bengal election tightened the picture further. While a number of agencies still showed the Trinamool Congress marginally ahead, several forecasts depicted a razor-thin finish. Some even predicted that the BJP could emerge as the largest party or might cross the halfway mark in the 294-seat Assembly.

An NDTV poll of polls for the 2021 West Bengal election averaged these estimates and suggested roughly 156 seats for the Trinamool Congress and around 121 for the BJP. This composite picture still placed the TMC in front yet implied a far narrower victory than the final results, which delivered a much wider difference in seats between the two main parties.

2021 West Bengal election final tally and lessons for 2026

The 2021 West Bengal election has since become a case study on how polls can correctly identify the leading party yet misjudge the eventual scale of that party’s dominance. For analysts tracking the 2026 contest, 2021 serves as a benchmark: opinion polls largely leaned towards the Trinamool Congress, exit polls made the race appear extremely close, but the actual ballot delivered a decisive TMC win.