Dec 16, 2025 – The Election Commission releases the first‑phase draft SIR roll for West Bengal, showing more than 58 lakh electors deleted and flagging anomalies such as unusually high young deaths, gender‑biased deletions and disproportionate impact on certain communities [1].

Dec 19, 2025 – The EC announces the appointment of roughly 4,000 micro‑observers to oversee SIR hearings across 294 assembly constituencies, sets the hearing schedule to start on Dec 27, and states that the notice‑sending phase will close on Feb 7, 2026 with the final electoral roll to be published on Feb 14, 2026 [10].

Dec 22, 2025 – Chief Minister Mamata Banerjee tells a gathering of TMC booth‑level agents that “the Election Commission is working only as per directions of the BJP,” criticises the appointment of observers without state notice and denounces micro‑observers for lacking local‑language knowledge [9].

Dec 27, 2025 – SIR hearings commence at 3,234 centres statewide, targeting about 32 lakh unmapped voters; over 4,500 micro‑observers supervise the process, voters may submit any of 12 documents (Aadhaar not standalone), and electors aged 85 or above are exempt from in‑person attendance [8].

Dec 28, 2025 – TMC MP Partha Bhowmik alleges the EC is forcing elderly and disabled voters to travel to distant hearing camps, while senior minister Sashi Panja calls the approach “inhuman” and urges home‑based hearings for all voters over 85, noting reports that roughly 1.36 crore people could be summoned [7].

Dec 30, 2025 – The EC orders home verification for voters aged 85 plus, ailing or disabled, directing officials to contact them by phone and verify at residence; Banerjee brands the SIR a “large scam aided by artificial intelligence,” claims 54 lakh names have been deleted, and threatens a march on the Election Commission office in Delhi if legitimate names disappear [6].

Jan 5, 2026 – SIR notices are issued to TMC MP‑turned‑MP Dev and cricketer Mohammed Shami (and Dev’s family); both cite the process as unprepared and flawed, and TMC leaders condemn the summons as evidence of the EC’s loss of credibility [5].

Jan 6, 2026 – Banerjee tells reporters, “the Election Commission is employing mobile applications developed by the BJP’s IT‑cell” for the SIR, adds that the exercise “marks eligible voters ‘dead’” and forces vulnerable people to attend hearings; on the same day TMC MP Derek O’Brien files a Supreme Court petition seeking intervention against the EC’s “arbitrary and procedurally irregular actions” [4].

Jan 8, 2026 – West Bengal’s election office announces that domicile certificates will not be accepted as evidence in SIR hearings, requiring voters to present state‑notified permanent‑address or residence certificates; officials warn that applicants who used domicile papers may be recalled for fresh hearings [3].

Jan 10, 2026 – Banerjee writes a fourth letter to the Chief Election Commissioner, alleging harassment of eminent citizens such as Nobel laureate Amartya Sen during the SIR, citing deaths, illnesses and stress‑related incidents, and notes the EC’s addition of four special roll observers to the panel [2].

Feb 3, 2026 – The Supreme Court schedules a batch of petitions on Feb 4 to challenge the constitutionality of the SIR and the mass deletion of voters; Banerjee secures a gate pass and prepares to appear before a bench led by Chief Justice of India Surya Kant, while the Court had earlier ordered the EC to publish the list of excluded voters [1].

Feb 4, 2026 – Banerjee appears in person before the Supreme Court as a batch of petitions questioning the SIR’s legality and the removal of over 58 lakh West Bengal electors are heard; the hearing forms part of a broader judicial review of the roll‑revision exercise [1].

Feb 7, 2026 – The notice‑sending phase of the SIR is slated to conclude, after which no further summons will be issued before the final roll is published [10].

Feb 14, 2026 – The Election Commission plans to publish the final electoral roll for West Bengal, concluding the Special Intensive Revision process [10].