Which party will gain most seats in Russian Parliamentary Election? [Subquestion: Will United Russia (ER) gain the most seats in the next Russian parliamentary election?]

probability: 61%

rationale:

Summary The resolution of this question depends on the absolute net gain in seats compared to the pre-election baseline, not the total number of seats won. While United Russia (ER) is highly likely to retain its constitutional majority and will win the most valid votes, the challenge lies in whether it can achieve the largest absolute increase in seats. Evidence suggests that ER is structurally positioned to do so, despite smaller parties having more room to grow proportionally. For example, if a smaller party like New People (NP) doubles its current faction of 15 seats, it would achieve a net gain of 15 seats. In contrast, ER only needs a 5 to 10 percent increase from its current baseline of roughly 312 active members to achieve a net gain of 20 to 30 seats.

The electoral machinery heavily favors ER, with the introduction of multi-day voting, electronic voting, and district manipulation all designed to consolidate its power 2 sources. Furthermore, ER benefits from the creation of 7 new single-member districts (SMDs) in occupied Ukrainian territories, providing a straightforward path to additional seats en.wikipedia.org. Additionally, if there is a tie in the number of seats gained, the tie-breaker goes to the party with the most valid votes. Polling consistently shows ER dominating the popular vote by a wide margin 3 sources, meaning any exact tie would definitively resolve in ER's favor.

Strongest Arguments for Yes

• Favorable Seat Mathematics: Because net seat gains are measured in absolute numbers rather than percentages, ER has a significant advantage. A massive proportional surge for a smaller party like NP (which has only 15 seats) still yields a modest absolute gain of 15 to 20 seats. ER only needs to modestly consolidate its massive baseline to surpass this number.
• Structural and Administrative Advantages: The Kremlin has set target performance metrics, with regional officials instructed to aim for a 55% vote share for ER russian-election-monitor.org. Expanded electronic voting and a managed electoral environment make it highly probable these targets will be met or exceeded nestcentre.org.
• New Constituencies: The addition of 7 new ER-friendly single-member constituencies in occupied Ukrainian territories (which did not vote in 2021) offers a guaranteed influx of new seats for the ruling party en.wikipedia.org.
• Fewer Concessions to the Opposition: Reports indicate that the "guaranteed passage corridor" of cleared single-member districts for systemic opposition parties has narrowed from roughly 20 down to 10-13 besacenter.org. This funnels more single-member victories directly to ER.

Strongest Arguments for No

• High Baseline Ceiling: ER currently sits near its practical ceiling, holding roughly 72% of the total seats. Because the stated strategy for the party often emphasizes "renewal" and "rotation" rather than outright expansion en.wikipedia.org, there is limited administrative appetite to push ER's seat count dramatically higher.
• The Surging New People Party: Polling indicates that NP has surged, reaching as high as 13.4% 2 sources, up from 5.3% in 2021. If the Kremlin actively sponsors NP as a "legalized form of protest" to act as a second pillar 2 sources, NP's seat count could easily jump by more than 20 seats, potentially outpacing ER's gains.
• CPRF Seat Redistribution: The Communist Party (CPRF) is in steep decline, dropping from roughly 19% in 2021 down to 10% in recent polling en.wikipedia.org. The seats CPRF loses must be redistributed, and the Kremlin may choose to direct these freed seats to NP or LDPR rather than inflating ER's already massive majority.

Key Uncertainties

• Administrative Calibration of the Vote: The exact balance the Kremlin strikes between ER and the systemic opposition is the primary variable. If the state engineers a more moderate ER result (e.g., 48-50%) while deliberately boosting NP to displace CPRF as the second major force russian-election-monitor.org, NP could secure the largest absolute gain.
• Pre-Election Baseline Shifts: There are currently 15 vacant mandates in the State Duma duma.gov.ru. If these seats are filled prior to the election, ER's starting baseline will rise, inherently lowering the maximum number of new seats it can net on election day.
• Polling vs. Official Results: Current polling places ER's genuine support between 30% and 39% 2 sources. The gap between these figures and the targeted official result of 55% relies entirely on administrative manipulation. If fraud is calibrated closer to vote share rather than explicit seat-gain targets, ER's absolute net gains could be surprisingly small.