Why does the Bundestag’s size vary? Its make-up has to reflect the results of the second vote. But it is common for voters to split their ballot, meaning parties often win more seats in the first vote than the second. If a party wins more constituencies than it is entitled to based on its list vote share, the extras are known as “overhang seats”. Other parties are awarded “balance seats” to keep the chamber proportionally representative of the list vote. This is why the current Bundestag, which was elected in 2017 with 709 members, is the biggest ever (see chart). To keep its size in check German parliamentarians voted last year to reduce the number of constituencies from 299 to 280 by 2025.
Parties devise their lists for the second vote at their conferences several months ahead of the election. This is often where their candidate for chancellor is chosen, too. Germany’s government is usually a coalition. After the vote, talks get under way between parties and the new parliament is expected to convene within one month of the election. Whichever group of parties can command a majority gets to govern. Usually, the coalition party with the most seats fields the chancellor.
Who might that be? Our poll tracker shows the latest odds for the contenders to succeed Angela Merkel.
For more coverage of the German elections, visit our dedicated hub