Germany's 5 Percent Rule Was Designed to Prevent Weimar

The Weimar Republic used a more or less pure proportional system. A party that won one percent of the national vote got roughly one percent of the Reichstag's seats. By 1930, that math was producing a chamber with more than a dozen factions and chronic coalition failure. The Sperrklausel — the five-percent hurdle written into West German federal law in 1949 — was a direct response.

The drafters of the Basic Law actually omitted it. The Parliamentary Council's main committee deleted a constitutional affirmation of an electoral hurdle from the draft, leaving the question to ordinary legislation. The Allied military governors, with the agreement of the West German state premiers, then put a five-percent threshold into the first electoral law for the 1949 Bundestag election. For that first vote it applied separately within each Land; on 25 June 1953 the Bundestag rewrote the law so the threshold was calculated on votes cast nationwide.

A party that clears five percent of the second-vote (the list vote) gets seats roughly proportional to its share. A party that does not clear five percent gets nothing — unless it wins at least three single-member constituencies, the Grundmandatsklausel exemption originally added for regional parties like the Bavarian CSU. The Federal Constitutional Court has repeatedly upheld the threshold for federal elections while striking it down for European Parliament elections, where coalition-building stakes are lower.

The practical effect is visible in any modern Bundestag photograph: between four and seven parties, never twelve. Whether that stability is worth the votes that go unrepresented is a question the Karlsruhe judges have answered, on balance, yes.