Think tanks who back a wealth tax

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

Arena Idé: Think tank of the Arena group (labour-movement affiliated) (Sweden, grade A)
Center for Law and Social Policy: Policy organisation (United States, grade A)
Center of Economic and Law Studies: Economic and policy research institute (Indonesia, grade A)
Dejusticia (Colombia, grade A)
EU Tax Observatory: Research lab hosted by the Paris School of Economics, directed by Gabriel Zucman (France, grade A)
Economistas Frente a la Crisis: Association of Spanish economists (Spain, grade A)
Institute for Policy Studies: Progressive think tank; inequality programme (United States, grade A)
Institute on Taxation and Economic Policy (ITEP): Tax policy research organisation (United States, grade A)
Instituto Justiça Fiscal (Brazil, grade A)
Decharut Sukkumnoed: Director, Think Forward Center (Thailand, grade A)
Economic Security Project Action: Signatory, coalition letter (United States, grade A)
Konzeptwerk Neue Ökonomie: Think tank for economic alternatives (Germany, grade A)
New Economics Foundation: Think tank (United Kingdom, grade A)
The PRAKARSA: Welfare policy and fiscal justice research institute (Indonesia, grade A)
Anders Skrede: Advisor and author on welfare policy, Manifest Tankesmie (Norway, grade A)
Andreas Tharaldsen: Advisor and policy analyst, Manifest Tankesmie (Norway, grade A)
BC Policy Solutions: Independent public policy research institute (Canada, grade A)
Bangladesh Economic Association: Professional association of economists (Bangladesh, grade A)
Broadbent Institute: Public policy institute (Canada, grade A)
CE Delft: Independent environmental economics research organisation (Netherlands, grade A)
Canadian Centre for Policy Alternatives: Public policy research institute (Canada, grade A)
Causa Pública (Portugal, grade A)
CenTax (Centre for the Analysis of Taxation): Independent tax research centre; directors Arun Advani and Andy Summers (United Kingdom, grade A)
Center for American Progress: Signatory, coalition letter (United States, grade A)
Center for Common Ground: Signatory, coalition letter (United States, grade A)
Centro de Economía Política Argentina: Economic think tank (Argentina, grade A)
Compass: Progressive membership think tank (United Kingdom, grade A)
Demos: Signatory, coalition letter (United States, grade A)
Denktank Oikos: Socio-ecological think tank on post-growth and tax justice (Belgium, grade A)
Development Finance International: Co-publisher of a Southern African inequality report (Tanzania, grade A)
Dirk Holemans: Director of Denktank Oikos; former Member of the Flemish Parliament (Belgium, grade A)
Economic Change Unit: Think tank / research unit (United Kingdom, grade A)
Economic Opportunity Institute: Signatory, coalition letter (United States, grade A)
Economic Policy Institute: Signatory, coalition letter (United States, grade A)
Eirik Mofoss: Co-founder & former Managing Director, Tankesmien Langsikt (Norway, grade A)
Eteron – Institute for Research and Social Change: Greek research institute and campaign ambassador (Greece, grade A)
Fondazione Demo: Cultural and policy foundation close to the Democratic Party (Italy, grade A)
Forum Ökologisch-Soziale Marktwirtschaft (FÖS): Think tank for ecological tax reform (Germany, grade A)
Friedrich-Ebert-Stiftung – Slovakia: Slovak office of Friedrich-Ebert-Stiftung (Slovakia, grade A)
Fundar, Centro de Análisis e Investigación: Civil society research centre (Mexico, grade A)
Helle Cecilie Palmer: Editor and commentator, Tankesmien Agenda / Agenda Magasin (Norway, grade A)
IBON Foundation (Philippines, grade A)
Ida Søraunet Wangberg: Researcher and author, Manifest Tankesmie & former editor of Manifest Tidsskrift (Norway, grade A)
Inequality.org: Signatory, coalition letter (United States, grade A)
Ingrid Grønli Åm: Researcher, journalist, and author at Manifest Tankesmie & Klassekampen (Norway, grade A)
Insight Center for Community Economic Development: Signatory, coalition letter (United States, grade A)
Institut Emile Vandervelde: Research and study centre of the Parti Socialiste (Belgium, grade A)
Institut de recherche et d’informations socioéconomiques: Quebec socioeconomic policy research institute (Canada, grade A)
Institute for Demographic and Poverty Studies: Independent research institute on poverty, inequality, and public finance (Indonesia, grade A)
Institute for Policy Studies: US progressive think tank that co-produced the Nigeria-specific progressive weal (Nigeria, grade A)
Instituto de Pensamiento y Políticas Públicas: Public policy institute (Argentina, grade A)
International Centre for Tax and Development (Pakistan, grade A)
International Tax Observatory: Published the April 2026 brief for a minimum effective wealth tax in Uruguay, wi (Uruguay, grade A)
Magnus Marsdal: Director, Manifest Tankesmie & Editor-in-Chief, Manifest Media (Norway, grade A)
Maine Center for Economic Policy: Signatory, coalition letter (United States, grade A)
Manifest Tankesmie: Left-leaning think tank (Norway, grade A)
Marte Gerhardsen: Director-General, Agency for Education & founding CEO of Tankesmien Agenda (2014 (Norway, grade A)
Momentum Institut: Progressive economic think tank (Austria, grade A)
National Planning Institute: Public research institute (Egypt, grade A)
Nevin Economic Research Institute: Economic research institute (Ireland, grade A)
North Carolina Budget & Tax Center: Signatory, coalition letter (United States, grade A)
Observatoire tunisien de l'économie: Independent economic observatory (OTE) (Tunisia, grade A)
Oklahoma Policy Institute: Signatory, coalition letter (United States, grade A)
Ola H. B. Pedersen: Social scientist and policy writer on taxation and economic democracy (Norway, grade A)
Pennsylvania Policy Center: Signatory, coalition letter (United States, grade A)
Polski Instytut Ekonomiczny: Public economic think tank (Poland, grade A)
Postgroei Nederland: Post-growth research and advocacy network (Netherlands, grade A)
Progresívne fórum (Proforum): Slovak progressive civic association (Slovakia, grade A)
Prosperity Now: Signatory, coalition letter (United States, grade A)
TASC: Think tank for action on social change (Ireland, grade A)
Tankesmien Agenda: Centre-left think tank (Norway, grade A)
Tankesmien Langsikt: Independent think tank on long-term policy and institutional resilience (Norway, grade A)
Tax Justice Network US: Signatory, coalition letter (United States, grade A)
The Australia Institute: Public policy think tank (Australia, grade A)
The Commonwealth Institute for Fiscal Analysis: Signatory, coalition letter (United States, grade A)
Tiril Halvorsen: Senior Advisor and researcher on economic inequality, Tankesmien Agenda (Norway, grade A)
Trine Østereng: Senior Adviser, Tankesmien Agenda (Norway, grade A)
Trygve Svensson: CEO, Tankesmien Agenda & Associate Professor, University of Bergen (Norway, grade A)
World Inequality Lab: Research lab publishing the World Inequality Database; publisher of the 2024 Ind (India, grade A)
ungleichheit.info: Inequality information platform (Germany, grade A)
Centre for Policy Dialogue: Independent think tank, Dhaka (Bangladesh, grade B)
Institute of Public Finance: Nairobi public-finance think tank (IPF Kenya) (Kenya, grade B)
Agnes Gelting Andresen: Rådgiver i Tankesmien Agenda (Norway, grade B)
Axel Fjeldavli: Head of Analysis, Tankesmien Agenda (Norway, grade B)
Bait Al-Amanah: Independent research institute (Malaysia, grade B)
Barbara Blaha: Leiterin des Momentum Instituts (Austria, grade B)
Centre Ali Ben Ghedhahem pour la justice fiscale: Tax justice research centre (Tunisia, grade B)
Centro de Estudios para el Desarrollo Laboral y Agrario: Labour and agrarian research centre (Bolivia, grade B)
Centro de Investigación Económica y Presupuestaria: Public finance research centre (Mexico, grade B)
Centro de Investigación y Formación de la República Argentina: Research institute of CTA (Argentina, grade B)
Denktank Minerva: Progressive think tank on socioeconomic policy and tax justice (Belgium, grade B)
Dieese (Brazil, grade B)
Economics Association of Malawi: National professional economics association (Malawi, grade B)
FiscalFuture e.V.: Youth think tank for fiscal policy (Germany, grade B)
Fundación Friedrich-Ebert Chile: Campaign organiser (Chile, grade B)
GROWFORD Institute: Independent economic and finance research institute (Ukraine, grade B)
Groundwork Collaborative: Economic policy think tank (United States, grade B)
Grupo Economía Pluralista: Group of about 30 Costa Rican economists and academics (Costa Rica, grade B)
Hans-Böckler-Stiftung: Foundation of the German Trade Union Confederation (research funding, IMK, WSI) (Germany, grade B)
Hilde Nagell: Fagsjef i Tankesmien Agenda, forfatter (Norway, grade B)
Inesc (Instituto de Estudos Socioeconômicos) (Brazil, grade B)
Institute for Development of Economics and Finance: Economic research institute (Indonesia, grade B)
Institute for Economic Justice: Johannesburg-based progressive economic policy think tank (South Africa, grade B)
Institute of Strategic & International Studies (ISIS) Malaysia: National strategic and policy think tank (Malaysia, grade B)
Kari Kristensen: Special Advisor, Tankesmien Agenda (Norway, grade B)
Kristian Skard: Partner & Advisor, Agenda Rådgivning (Norway, grade B)
Observatoire québécois des inégalités: Quebec inequality research and knowledge organisation (Canada, grade B)
Observatorio de la Responsabilidad Social Corporativa: Member of the Plataforma por la Justicia Fiscal (Spain, grade B)
Research for Social Advancement: Think tank (Malaysia, grade B)
Trond Gram: Special Advisor, Tankesmien Agenda (Norway, grade B)
Vereniging van Economisten in Suriname: Professional association of economists in Suriname (Suriname, grade B)
Centro Estratégico Latinoamericano de Geopolítica: Think tank (Argentina, grade C)
Finabi Conseil: Financial and tax policy research and consulting cabinet in Algiers (Algeria, grade C)