Poaty-Souchlaty was the minister of finance from 1976 to 1983. He served in the government as Minister of Trade and Small and Medium-Sized Enterprises from 1986 to July 1989. Following the Fourth Ordinary Congress of the Congolese Labour Party (PCT) in late July 1989, he was appointed as Prime Minister on 7 August, succeeding Ange-Edouard Poungui. The new government headed by Poaty-Souchlaty was named on 13 August.
After a little more than a year in office, Poaty-Souchlaty resigned on 3 December 1990, as the PCT's single-party regime was coming to an end. He resigned from the PCT at the same time. Poaty-Souchlaty was said to have disagreed with the president, Denis Sassou Nguesso, about what political course the country should take in the face of widespread demands for change.
After his resignation, Poaty-Souchlaty created the Republican Union for Progress (Union républicaine pour le progrès, URP). During the 1992 parliamentary elections, the URP received three seats. At the same time, Poaty-Souchlaty was a candidate in the August 1992 presidential election, placing 12th with 0.30% of the vote.
After leaving the URP, Poaty-Souchlaty joined the Pan-African Union for Social Democracy (UPADS) in 1992. Although he was not given a position during Pascal Lissouba's presidency from 1992 to 1997, Poaty-Souchlaty was elected as one of the party's 25 vice-presidents in December 2006, at its first extraordinary congress.
- Clark, John Frank; Decalo, Samuel (2012). Historical Dictionary of Republic of the Congo (4th ed.). pp. 363–364. ISBN 9780810849198.
- "Alphonse Poaty-Souchlaty". plex.page. 4 December 2020. Archived from the original on 2021-07-29. Retrieved 29 July 2021.
- "FORMER MINISTERS | Ministry of Finance and Budget". www.finances.gouv.cg.
- "Aug 1989 - Congo", Keesing's Record of World Events, volume 35, August 1989, page 36,842.
- John F. Clark, "Congo: Transition and the Struggle to Consolidate", in Political Reform in Francophone Africa (1997), ed. John F. Clark and David E. Gardinier, page 68.
- "Congo prime minister resigns", Rocky Mountain News, 5 December 1990.
- Xavier Bienvenu Kitsimbou, "La démocratie et les réalités ethniques au Congo", University of Nancy II, 26 October 2001, page 104 (in French).
- "Pascal Tsati Mabiala élu secrétaire général de l'Union panafricaine pour la démocratie sociale (UPADS)", Les Dépêches de Brazzaville, 29 December 2006 (in French).