Luxembourg poll puts CSV-DP one seat short: what the May Sonndesfro does and does not show

Luxembourg's governing coalition would be one seat short of a parliamentary majority if the latest voting-intention survey were converted into seats. The Sonndesfro Mai 2026, conducted by ILRES for RTL and Luxemburger Wort, places the CSV and DP together on 30 of the Chamber's 60 seats. A majority requires 31.

The distinction matters. This is not a vote, and it is not a prediction of the next legislative election. It is a survey of 1,225 people eligible to vote in Luxembourg, interviewed online and by telephone from 13 to 24 April 2026, with a reported maximum sampling margin of 2.8 percentage points. Published on 5 May, it offers the clearest current measurement of political preferences, but not a verdict already delivered.

CSV falls sharply; several parties advance

The biggest movement against the 2023 election baseline is the CSV's. The party is measured at 21.8%, down 8.0 percentage points from the 29.8% baseline in the poll report, and its projected representation falls from 21 to 15 seats. Its coalition partner, the DP, is measured at 21.5%, up 2.8 points, and moves from 14 to 15 projected seats. The parties are virtually level in vote intention, but the CSV decline removes the coalition's margin.

The LSAP is close behind on 20.9%, two points above its 2023 baseline, with 14 projected seats rather than 11. The ADR records 11.4% and seven projected seats, two more than in 2023. Déi Gréng measure 9.5%, with six projected seats, while déi Lénk stand at 5.8% and retain two seats in the model. The Pirates are the other clear loser in this snapshot: 3.8% and one projected seat, compared with three seats in 2023.

Those figures imply a fragmented chamber. In the ILRES model, CSV-DP totals 30 seats, while CSV-LSAP and DP-LSAP would each total 29. None reaches 31. Coalition arithmetic would therefore require a third party, or a different configuration, if these numbers were reproduced at an election. It is more precise to say coalition options would widen than to declare which government would follow.

A dissatisfied electorate, but no proven cause

The same survey provides important context. It measures 57% as dissatisfied with the government's work and 41% as satisfied. In the previous November 2025 reading presented in the report, the balance was reversed: 54% satisfied and 44% dissatisfied. The economic assessment has also worsened: 68% now give the country's economic situation a negative assessment, compared with 46% in November.

Asked openly which topics politics should urgently address, respondents most often identify housing, at 21%. Pensions follow at 18%, the economy and jobs at 10%, and migration or integration at 9%. These answers help explain the environment in which governing parties are being judged. They do not demonstrate that housing, pensions or another issue directly caused any individual to leave the CSV or choose the LSAP, DP or ADR. A poll can show coexistence of concerns and vote intention; it cannot on its own establish motive.

Who gains, who loses, and how to read it

The CSV is the principal loser measured in the survey because its fall is both large in votes and decisive for the coalition majority. The DP gains support, yet cannot compensate for its partner's decline. The LSAP emerges as the strongest opposition beneficiary in projected seats, closing the gap with both government parties. ADR and déi Gréng also gain seats in the model, suggesting that dissatisfaction is not concentrated in one ideological direction. Déi Lénk increase their vote share without gaining a seat; the Pirates lose votes and two projected mandates.

Objectivity also requires caution around small differences. CSV, DP and LSAP are separated by less than one percentage point, well within the survey's stated maximum margin. The ranking of the three largest parties should therefore not be treated as settled. The robust finding is broader: support is dispersed among three similarly measured parties while the incumbent two-party majority is not reproduced by this survey.

What comes next

The official 2023 election result remains the legal composition of the Chamber, and national elections are next due in 2028 unless political circumstances change that timetable. For the present, the Sonndesfro is an accountability signal. It records pressure on the governing coalition, especially on the CSV, at a time when housing affordability, pensions and economic confidence dominate respondents' stated concerns.

A subsequent survey will be needed to establish persistence. If the CSV remains far below its 2023 level, if the LSAP and smaller parties retain their gains, and if negative economic perceptions persist, the political question will move from a difficult poll result to a durable challenge for coalition strategy. Until then, the verified conclusion is narrower: in April's measurement, Luxembourg's electoral field is tightly divided and the current government's parliamentary majority disappears in the seat projection.