Parties who back a wealth tax

The strongest evidence first. Each name opens its dated, quoted sources.

Vänsterpartiet: Political party (Riksdag) (Sweden, grade A)
SPD (Sozialdemokratische Partei Deutschlands): Political party (Bundestag, federal government) (Germany, grade A)
Bündnis 90/Die Grünen: Political party (Bundestag) (Germany, grade A)
Communist Party of India (Marxist): Political party (Lok Sabha) (India, grade A)
Reformisterna (S association): Largest association within the Social Democratic Party (Sweden, grade A)
Die Linke: Political party (Bundestag) (Germany, grade A)
Green Party of England and Wales: Political party (United Kingdom, grade A)
Miljöpartiet de gröna: Political party (Riksdag) (Sweden, grade A)
Partido dos Trabalhadores (PT): Political party (Câmara, Senado, government) (Brazil, grade A)
Alice B. Toklas LGBTQ Dems (United States, grade A)
Bloque Nacionalista Galego (BNG): Political party (represented in the Congreso) (Spain, grade A)
Democratic Socialists of America – CA (United States, grade A)
EH Bildu: Political party (represented in the Congreso) (Spain, grade A)
GroenLinks-PvdA: Political party (Tweede Kamer) (Netherlands, grade A)
Jusos (Jungsozialisten in der SPD): Youth organisation of the SPD (Germany, grade A)
Podemos: Political party (represented in the Congreso) (Spain, grade A)
SP (Socialistische Partij): Political party (Tweede Kamer) (Netherlands, grade A)
Working Families Party: Political organization (United States, grade A)
BIJ1: Political party (Netherlands, grade A)
California Democratic Party: California political party (United States, grade A)
Catalunya en Comú (Comuns): Catalan left party; group in the Parlament (Spain, grade A)
ChristenUnie: Political party (Tweede Kamer) (Netherlands, grade A)
Communist Party of India: Political party (Lok Sabha) (India, grade A)
Communist Party of India (Marxist-Leninist) Liberation: Political party (Lok Sabha) (India, grade A)
D66: Political party (Tweede Kamer) (Netherlands, grade A)
Die Linke Fraktion im Sächsischen Landtag: Parliamentary group in the Saxony state parliament (Germany, grade A)
Economic Freedom Fighters: South African left party and third-largest opposition party (South Africa, grade A)
Frente Amplio: Governing coalition and party (Uruguay, grade A)
Frente Amplio (Sumar, IU, Más Madrid, Comuns): Electoral coalition for the 29 Nov 2026 general election; candidate Ada Colau (Spain, grade A)
Green Party: Political party (Ireland, grade A)
Grön Ungdom: Youth wing of the Green Party (Sweden, grade A)
Hackney Green Group: Green Party group on Hackney Council (United Kingdom, grade A)
Les Écologistes: Political party (France, grade A)
New Democratic Party — Ottawa Centre: Federal riding association;2021 convention resolution submitter (Canada, grade A)
Parti du Progrès et du Socialisme: Left-wing political party in Morocco; parliamentary group in the Chambre des Rep (Morocco, grade A)
Partido Socialismo e Liberdade (PSOL): Political party (Câmara) (Brazil, grade A)
Partido Socialista Obrero Español (PSOE): Political party; senior partner in the governments of 2018- (Spain, grade A)
Partij voor de Dieren: Political party (Tweede Kamer) (Netherlands, grade A)
Párbeszéd – A Zöldek Pártja: Left-green party; tabled wealth-tax bills in 2023 and 2025 (Hungary, grade A)
Radnička fronta (Croatia, grade A)
Razem: Political party (Poland, grade A)
Revolución Ciudadana: Political movement (Correísmo) (Ecuador, grade A)
SSU (Socialdemokratiska Ungdomsförbundet): Youth wing of the Social Democrats (Sweden, grade A)
Samfylkingin (Iceland, grade A)
San Diego County Young Democrats (United States, grade A)
Scottish Greens: Political party (Scotland) (United Kingdom, grade A)
Social Democratic Party of Bosnia and Herzegovina (SDP BiH) (Bosnia and Herzegovina, grade A)
Sumar: Political party (Congreso) (Spain, grade A)
Sósíalistaflokkur Íslands (Iceland, grade A)
Tisza Party (Tisztelet és Szabadság Párt): Governing party since 2026; leader Péter Magyar (Hungary, grade A)
Unidas Podemos-En Comú Podem-Galicia en Común (parliamentary group): Parliamentary group, Congreso (XIV legislature) (Spain, grade A)
Wellstone Democratic Renewal Club (United States, grade A)
déi Lénk (Luxembourg, grade A)
déi gréng (Luxembourg, grade A)
Левица (Levica): Political party (North Macedonia, grade A)
African National Congress: South Africa's governing party, in the Government of National Unity (South Africa, grade A)
Alianza Electoral Venceremos: Electoral alliance (Peru, grade A)
Alianza Verde (Colombia, grade A)
All India Forward Bloc: Political party (India, grade A)
Alleanza Verdi e Sinistra: Parliamentary political alliance (Greens and Left Alliance) (Italy, grade A)
Alliance: Political party (New Zealand, grade A)
Arbeiderpartiet: Political party (Norway, grade A)
Australian Greens: Political party (Australia, grade A)
Bloc "Pour que le peuple triomphe": Parliamentary bloc in the Assemblée des représentants du peuple (Tunisia, grade A)
Bloco de Esquerda (Portugal, grade A)
Bündnis 90/Die Grünen Niedersachsen: State branch of the Greens in Lower Saxony (Germany, grade A)
Bündnis Sahra Wagenknecht (BSW): Political party (not in the Bundestag since 2025) (Germany, grade A)
Calderdale Green Group: Green Party group on Calderdale Council (United Kingdom, grade A)
California Communist Party USA: State organising committee, Communist Party USA (United States, grade A)
Canada’s Young New Democrats: Federal New Democratic Party youth wing;2021 convention resolution submitter (Canada, grade A)
Christchurch East Labour Electorate Committee: Local Labour Party electorate organisation (New Zealand, grade A)
Coaliția pentru Națiune: Political party (Romania, grade A)
Communist Party of Finland: Political party (Finland, grade A)
DSA Long Beach: Chapter of the Democratic Socialists of America (United States, grade A)
DSA San Diego: Democratic Socialists of America chapter, San Diego (United States, grade A)
DWARS, GroenLinkse Jongeren: GreenLeft youth organisation (Netherlands, grade A)
Die Linke Fraktion im Abgeordnetenhaus von Berlin: Parliamentary group in the Berlin state parliament (Germany, grade A)
Die Linke Fraktion im Hessischen Landtag: Parliamentary group in the Hesse state parliament (Germany, grade A)
Die Linke Fraktion im Landtag von Sachsen-Anhalt: Parliamentary group in the Saxony-Anhalt state parliament (Germany, grade A)
Ecolo: Belgian Francophone green political party (Belgium, grade A)
Eesti Vasakliit: Estonian political party (formerly Eestimaa Ühendatud Vasakpartei) (Estonia, grade A)
Enhedslisten: Political party (Denmark, grade A)
Erakond Eestimaa Rohelised: party (Estonia, grade A)
Europa Verde: Green political party (Italy, grade A)
Ezker Anitza-IU: Basque branch of Izquierda Unida (Spain, grade A)
Falu arbetarekommun: Local Social Democratic organisation (Sweden, grade A)
Frente Guasu (Paraguay, grade A)
Frente de Todos — General Pueyrredón council group: Municipal council group (Argentina, grade A)
Frie Grønne: Political party (Denmark, grade A)
Fédération de la Gauche Démocratique: Left-wing political alliance and party (Chambre des Représentants) (Morocco, grade A)
Greek Left Alliance (ELAS): Political party (Greece, grade A)
Green League: National political party (Finland, grade A)
Green Party of Aotearoa New Zealand: Political party (New Zealand, grade A)
Green Party of British Columbia: Provincial political party (Canada, grade A)
Green Party of California: California political party (United States, grade A)
Green Party of Canada: Federal political party (Canada, grade A)
Green Party of Korea (녹색당): Political party (South Korea, grade A)
Green Youth of Finland: Political youth organisation (Finland, grade A)
Greens Switzerland (GRÜNE Schweiz): National party (Switzerland, grade A)
Groen: Flemish green political party (Belgium, grade A)
Gällivare arbetarekommun: Local Social Democratic organisation (Sweden, grade A)
Gävle Norra S-förening: Local Social Democratic association (Sweden, grade A)
Handels S-förening Göteborg: Local Social Democratic association (Sweden, grade A)
Hedemora arbetarekommun: Local Social Democratic organisation (Sweden, grade A)
Husie S-förening: Local Social Democratic association (Sweden, grade A)
Izquierda Socialista: Political party (Argentina, grade A)
Izquierda Unida: Political party (member of Sumar in the Congreso) (Spain, grade A)
Jamaat-e-Islami Pakistan (Pakistan, grade A)
Japanese Communist Party (日本共産党): Political party in the National Diet (Japan, grade A)
Jonge Democraten: Independent political youth organisation associated with D66 (Netherlands, grade A)
Jonge Socialisten in de PvdA: Labour youth organisation (Netherlands, grade A)
Justice Party (정의당): Political party (South Korea, grade A)
Kommunistische Partei Österreichs (KPÖ): Political party (Austria, grade A)
Kosmos: Green political party (Greece, grade A)
LIVRE (Portugal, grade A)
La France insoumise (LFI): Political party (France, grade A)
Labour Party (노동당): Political party (South Korea, grade A)
Leeds Green Group: Green Party group on Leeds City Council (United Kingdom, grade A)
Left Alliance: Political party (Finland, grade A)
Left Party (Turkey, grade A)
Left Youth of Finland: Political youth organisation (Finland, grade A)
Levica (Slovenia, grade A)
Majorna S-förening: Local Social Democratic association (Sweden, grade A)
Miljøpartiet De Grønne: Political party (Norway, grade A)
Mouvement Populaire: Political party in Morocco; parliamentary group (Groupe Haraki) in the Chambre d (Morocco, grade A)
Move Forward Party: Political party (2020–2024) (Thailand, grade A)
Movimento 5 Stelle: Political party (Five Star Movement) (Italy, grade A)
New Democratic Party: Federal political party (Canada, grade A)
New Democratic Party of Prince Edward Island: Provincial New Democratic Party (Canada, grade A)
New Democratic Party — Alfred-Pellan: Federal riding association;2021 convention resolution submitter (Canada, grade A)
New Democratic Party — Don Valley East: Federal riding association;2021 convention resolution submitter (Canada, grade A)
New Democratic Party — Eglinton—Lawrence: Federal riding association;2021 convention resolution submitter (Canada, grade A)
New Democratic Party — Etobicoke—Lakeshore: Federal riding association;2021 convention resolution submitter (Canada, grade A)
New Democratic Party — Glengarry—Prescott—Russell: Federal riding association;2021 convention resolution submitter (Canada, grade A)
New Democratic Party — Halifax: Federal riding association;2021 convention resolution submitter (Canada, grade A)
New Democratic Party — Hamilton Centre: Federal riding association;2021 convention resolution submitter (Canada, grade A)
New Democratic Party — New Westminster–Burnaby: Federal riding association; formal resolution submitter (Canada, grade A)
New Democratic Party — Ottawa South: Federal riding association;2021 convention resolution submitter (Canada, grade A)
New Democratic Party — Pickering—Uxbridge: Federal riding association;2021 convention resolution submitter (Canada, grade A)
New Democratic Party — Regina—Qu’Appelle: Federal riding association;2021 convention resolution submitter (Canada, grade A)
New Democratic Party — Toronto Centre: Federal riding association;2021 convention resolution submitter (Canada, grade A)
New Democratic Party — Toronto—St. Paul’s: Federal riding association;2021 convention resolution submitter (Canada, grade A)
New Democratic Party — Vancouver Granville: Federal riding association;2021 convention resolution submitter (Canada, grade A)
New Democratic Party — Winnipeg Centre: Federal riding association;2021 convention resolution submitter (Canada, grade A)
New Democratic Party — York Centre: Federal riding association;2021 convention resolution submitter (Canada, grade A)
PTB-PVDA: Belgian left political party (Parti du Travail de Belgique / Partij van de Arbei (Belgium, grade A)
Partai Buruh: Labour Party of Indonesia (Indonesia, grade A)
Parti Socialiste: Francophone Belgian social-democratic party (Belgium, grade A)
Parti Socialiste Unifié: Democratic socialist political party (Chambre des Représentants) (Morocco, grade A)
Parti Sosialis Malaysia: Political party (Malaysia, grade A)
Parti communiste français (PCF): Political party (France, grade A)
Parti socialiste (PS): Political party (France, grade A)
Partido Comunes (Colombia, grade A)
Partido Comunista Português (Portugal, grade A)
Partido Morado: Political party (Peru, grade A)
Partido Socialista (Portugal, grade A)
Partido Socialista del Uruguay: Party within the Frente Amplio (Uruguay, grade A)
Partido del Trabajo: National political party (Mexico, grade A)
Partidul SENS: Political party (Romania, grade A)
Partiet Vändpunkt: Party founded 2019 by Carl Schlyter after leaving the Green Party (Sweden, grade A)
Partito della Rifondazione Comunista: Communist political party (Italy, grade A)
People Before Profit: Political party (Ireland, grade A)
People's Party: Political party (Thailand, grade A)
Peoples' Equality and Democracy Party (Turkey, grade A)
Piratenpartij Nederland: Dutch Pirate Party (Netherlands, grade A)
Plaid Cymru: Political party (Wales) (United Kingdom, grade A)
Progressive Party (진보당): Political party (South Korea, grade A)
Progressive Party Gwangju branch (진보당 광주시당): Gwangju regional branch of the Progressive Party (South Korea, grade A)
Progressive Party of Aotearoa New Zealand: Political party (New Zealand, grade A)
Québec solidaire: Quebec provincial political party (Canada, grade A)
Québec solidaire Granby: Local Québec solidaire association; manifesto signatory (Canada, grade A)
Québec solidaire Hochelaga-Maisonneuve: Local Québec solidaire association; manifesto signatory (Canada, grade A)
Québec solidaire Rimouski: Local Québec solidaire association; manifesto signatory (Canada, grade A)
Reiwa Shinsengumi (れいわ新選組): Political party in the National Diet (Japan, grade A)
Revolutionary Socialist Party: Political party (Lok Sabha) (India, grade A)
Rifondazione Comunista — Federazione di Lucca: Provincial federation of Partito della Rifondazione Comunista (Italy, grade A)
Rød Ungdom: Youth wing of the Red Party (Norway, grade A)
Rødt: Political party (Norway, grade A)
SP Amsterdam: Amsterdam branch of the Socialist Party (Netherlands, grade A)
SP Eindhoven: Eindhoven branch of the Socialist Party (Netherlands, grade A)
SP Venlo: Venlo branch of the Socialist Party (Netherlands, grade A)
SP Zwolle: Zwolle branch of the Socialist Party (Netherlands, grade A)
SPÖ (Sozialdemokratische Partei Österreichs): Political party (Austria, grade A)
Sala arbetarekommun: Local Social Democratic organisation (Sweden, grade A)
Scottish National Party (SNP): Political party (Scotland) (United Kingdom, grade A)
Senterpartiet: Political party (Norway, grade A)
Sinistra Italiana: Democratic socialist political party (Italy, grade A)
Social Democratic Party (社会民主党): Political party in the National Diet (Japan, grade A)
Social Democratic Party of Switzerland (SP): National party (Switzerland, grade A)
Social Democrats: Political party (Ireland, grade A)
Socialdemokraterna Sjuhäradsbygdens partidistrikt: Social Democratic party district in Sjuhärad (Sweden, grade A)
Socialist Alliance: Political party (Australia, grade A)
Socialistisk Folkeparti: Political party (Denmark, grade A)
Sociální demokracie (SOCDEM): Politická strana (Czechia, grade A)
Solidaritet: Swedish socialist political party (Sweden, grade A)
Sosialistisk Ungdom: Youth wing of the Socialist Left Party (Norway, grade A)
Sosialistisk Venstreparti: Political party (Norway, grade A)
South African Communist Party: South African communist party, in alliance with the ANC (South Africa, grade A)
Sozialdemokratische Partei Österreichs, Landesorganisation Wien (SPÖ Wien): Political party state organisation (Austria, grade A)
Strana zelených (Zelení): Politická strana (Czechia, grade A)
Te Pāti Māori: Political party (New Zealand, grade A)
The Workers' Party: Political party (Singapore, grade A)
Unga Socialdemokrater Göteborg S-förening: Local Social Democratic association (Sweden, grade A)
Unidad Ciudadana – Frente de Todos — Coronel Pringles council group: Municipal council group (Argentina, grade A)
Verdi del Ticino: Cantonal section of the Greens (Switzerland, grade A)
Victorian Socialists: Political party (Australia, grade A)
Vooruit: Flemish social-democratic political party (Belgium, grade A)
Vänsterpartiet Backa (Göteborg): Left Party branch in Backa, Göteborg (first-named submitter of congress motion A (Sweden, grade A)
Welsh Liberal Democrats: Political party (Wales) (United Kingdom, grade A)
Young Left: Political youth organisation (Młoda Lewica) (Poland, grade A)
Young New Democrats of Quebec: Quebec youth wing of the federal New Democratic Party; resolution submitter (Canada, grade A)
Ung Vänster: Youth wing of the Left Party (Sweden, grade B)
ADPD – The Green Party (Alternattiva Demokratika): Political party (member of the European Greens) (Malta, grade B)
Candidatura d'Unitat Popular (CUP): Political party (represented in the Congreso) (Spain, grade B)
Compromís: Political party (represented in the Congreso) (Spain, grade B)
Esquerra Republicana de Catalunya (ERC): Political party (represented in the Congreso) (Spain, grade B)
Juntos por el Perú: Political party (Peru, grade B)
Más País: Political party (represented in the Congreso) (Spain, grade B)
Parti des Travailleurs: Left-wing political party in Algeria (Algeria, grade B)
Partido Comunista do Brasil (PCdoB): Political party (Câmara) (Brazil, grade B)
Partido Democrático Trabalhista (PDT): Political party (Câmara) (Brazil, grade B)
Socialni demokrati (SD) (Slovenia, grade B)
Volt Nederland: Political party (Tweede Kamer) (Netherlands, grade B)
uMkhonto weSizwe Party: South African opposition party founded by Jacob Zuma (South Africa, grade B)
A Just Russia - For Truth: Political Party (Russia, grade B)
AKEL (Progressive Party of Working People): Political party (Cyprus, grade B)
Akbayan Partylist (Philippines, grade B)
Alternative Liste Zürich: Party in the canton of Zurich (Switzerland, grade B)
Arbeidernes Ungdomsfylking: Youth wing of the Labour Party (Norway, grade B)
Assyrian Democrats of the Bay Area (United States, grade B)
Broederschap en Eenheid in de Politiek: Political party (Suriname, grade B)
Budoucnost: Politické hnutí (Czechia, grade B)
Coalición Canaria: Political party (Congreso) (Spain, grade B)
College Democrats at Sacramento State (United States, grade B)
DENK: Political party (Tweede Kamer) (Netherlands, grade B)
DSA Sebastopol (United States, grade B)
DSA Ventura (United States, grade B)
DSA – Los Angeles Chapter (United States, grade B)
Davis College Democrats (United States, grade B)
Democratic Socialists of America – Sacramento County (United States, grade B)
Fallbrook Democratic Club (United States, grade B)
Feminist Democrats of Sacramento County (United States, grade B)
Feministiskt initiativ: Political party (outside the Riksdag) (Sweden, grade B)
Foothills DSA (United States, grade B)
Fraksi PKB DPR RI: Parliamentary Faction (Indonesia, grade B)
Frente Amplio: Left party; its group filed expediente 21.883 (Costa Rica, grade B)
Front des Forces Socialistes: Social-democratic political party in Algeria (Algeria, grade B)
GOOD: South African political party led by Patricia de Lille (South Africa, grade B)
Green Liberal Party of Switzerland (GLP): National party (Switzerland, grade B)
Green Party of Ontario: Provincial political party (Canada, grade B)
Grupo Parlamentario del Partido del Trabajo: Parliamentary group in the Chamber of Deputies (Mexico, grade B)
Grønn Ungdom: Youth wing of the Green Party (Norway, grade B)
Grüne Kanton St. Gallen: Cantonal branch of the Greens (Switzerland, grade B)
Grüne Kanton Zürich: Party in the canton of Zurich (Switzerland, grade B)
Junts per Catalunya: Political party (Congreso) (Spain, grade B)
Kommunistesch Partei Lëtzebuerg (KPL) (Luxembourg, grade B)
LA County Democratic Party (United States, grade B)
Labour Party: Political party (Ireland, grade B)
Labour Party (Turkey, grade B)
Laguna Woods Democratic Club (United States, grade B)
Lambeth Green Group: Green Party group on Lambeth Council (United Kingdom, grade B)
Levice: Politická strana (Czechia, grade B)
Long Beach Latino Democratic Club (United States, grade B)
Los Angeles County Democratic Party: County Democratic party organisation, Los Angeles (United States, grade B)
Mouvement El Bina: Parliamentary political party in Algeria (Assemblée Populaire Nationale and Cons (Algeria, grade B)
Mouvement de la Société pour la Paix: Parliamentary political party in Algeria (Assemblée Populaire Nationale and Cons (Algeria, grade B)
Movimiento Ciudadano: National political party (Mexico, grade B)
Movimiento al Socialismo: Governing party 2006 to 2025 (Bolivia, grade B)
Muttahida Qaumi Movement: Political party represented in National Assembly and Senate (Pakistan, grade B)
Más Madrid: Political party (Madrid Assembly and Congreso) (Spain, grade B)
New Left (Nea Aristera): Political party (Greece, grade B)
Newham Green Group: Green Party group on Newham Council (United Kingdom, grade B)
POP Neuchâtel: Cantonal section of the Swiss Party of Labour (Switzerland, grade B)
Parti Socialiste des Travailleurs: Left-wing political party in Algeria (Algeria, grade B)
Parti de la Voie Démocratique Travailliste: Left-wing political party in Morocco (Morocco, grade B)
Partido Lakas ng Masa (Philippines, grade B)
Partido Manggagawa-Cebu (Philippines, grade B)
Partido Socialista Brasileiro (PSB): Political party (Câmara) (Brazil, grade B)
Partij voor Recht en Ontwikkeling: Political party (Suriname, grade B)
Pessoas–Animais–Natureza: Political party (PAN) (Portugal, grade B)
Piratska stranka Slovenije (Slovenia, grade B)
Progress Singapore Party: Political party (Singapore, grade B)
Red Dot United: Political party (Singapore, grade B)
Rede Sustentabilidade: Political party (Câmara) (Brazil, grade B)
Riverside County Young Democrats (United States, grade B)
S-studenter (Socialdemokratiska studentförbundet): Student federation of the Social Democrats (Sweden, grade B)
SP Den Haag: The Hague branch of the Socialist Party (Netherlands, grade B)
SP Heerlen: Heerlen branch of the Socialist Party (Netherlands, grade B)
SP Kanton St. Gallen: Cantonal branch of the Social Democratic Party (Switzerland, grade B)
SP Kanton Zürich: Party in the canton of Zurich (Switzerland, grade B)
SP Schaffhausen: Cantonal branch of the Social Democratic Party (Switzerland, grade B)
SP Utrecht: Utrecht branch of the Socialist Party (Netherlands, grade B)
SP Zutphen: Zutphen branch of the Socialist Party (Netherlands, grade B)
SYRIZA: Political party (Greece, grade B)
San Francisco Democratic Party: County Democratic Party central committee, San Francisco (United States, grade B)
San Francisco Young Democrats (United States, grade B)
Santa Barbara County Democratic Party (United States, grade B)
Sinn Féin: Political party (Ireland, grade B)
Socialdemokratiet: Political party (Denmark, grade B)
Solano County Democratic Central Committee (United States, grade B)