Estonian Reform Party was founded in 1994 by Siim Kallas, then-president of the Bank of Estonia, as a split from Pro Patria National Coalition Party. As the Reform Party has participated in most of the government coalitions in Estonia since the mid-1990s, its influence has been significant, especially regarding Estonia's free market and policies of low taxation. The party has been a full member of Liberal International since 1996, having been an observer member between 1994–1996, and a full member of the Alliance of Liberals and Democrats for Europe (ALDE). Reform Party leaders Siim Kallas, Taavi Rõivas, Andrus Ansip and Kaja Kallas have all served as prime ministers of Estonia. From 8 July 2022, the party has been the senior partner in a coalition government with Isamaa and the Social Democratic Party.

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