Immediately after the war Taviani became involved in the task of transforming the monarchy into a republic. Appointed to the Consulta he was later elected to the Constituent Council where he drafted the articles regarding property in the Constitution of the Italian Republic (arts. 41-45 in the final text). In the elections from 1948 to 1976 Taviani always managed to obtain the most votes among the deputies elected from Liguria. From 1947 to 1950 he was first Vice-secretary, then National Political Secretary of the Christian Democratic Party. In the party he always supported the secular basis that De Gasperi had wanted. In 1950 Taviani was head of the Italian delegation in Paris for the Schumann Plan, the first major step towards a united Europe.