The Socialist International is financed by annual affiliation fees from its member parties and some associated organisations, and by donations. The SI Finance and Administration Committee, a statutory body of the organisation composed of fifteen member parties and organisations elected following each Congress, agrees an annual budget which is adopted by the Council. The 2012 Budget totals £1,250,000 (pounds sterling).

During 2011 the International’s total income was £916,007 with a total expenditure of £951,736, as recorded in the financial statements of the organisation for the year ended 31 December 2011, which were as follows:

£47,291 for communications, including telephone, Internet, postal and printing costs;

£136,803 for rent of the office building and its maintenance, utilities, equipment, office supplies and professional services – banking, legal, accounting and insurance costs, translation and website management;

£335,010 for staff remuneration, national insurance contributions and pension plan;

£104,580 for costs relating to statutory meetings, including the Presidium meeting in Athens in March, meetings with the chair of SIFAC in Helsinki, the Council and related meetings in Athens in June, the Presidium meeting in New York held in conjunction with the United Nations General Assembly in September, meetings of the SWS Commission on climate change in Johannesburg in October and at the COP17 in Durban in December, as well as visits to several countries in the first half of the year in preparation of the June Council and to Costa Rica to prepare the subsequent Council.

£43,597 for costs of missions and delegations to member party meetings, seminars and congresses, including party meetings in Chile, mission to Belarus, ceremony in memory of Bruno Kreisky in Vienna, the Jean-Jaurès Foundation in Paris, meetings with the PvdA in Amsterdam, the congress of the Mauritius Labour Party and meetings with the Prime Minister, the PES Presidency in Brussels, the PES leaders meeting in Athens, the SAP congress in Stockholm, the PS congress in Porto, the PSCH congress in Santiago, the Policy Network meeting in Oslo, the congress of the SDP Montenegro, a pre-election delegation to Cameroon, a PRD meeting in Santo Domingo, the PDT Congress in Porto Alegre, observation of the elections in Cameroon, and the PES Council in Brussels.

£139,895 for costs of committees and other meetings, including the Ethics Committee in London, the meeting of parliamentarians from SI member parties held in conjunction with the 124th Inter-Parliamentary Union (IPU) Assembly in Panama, the Committee for the CIS, Caucasus and Black Sea in Kazakhstan, the Asia-Pacific Committee in Manila, the Committee for Latin America and the Caribbean in Bucaramanga, Colombia, the Middle East Committee in Tel Aviv and Ramallah, the Africa Committee in Windhoek, the Working Group on Reform in Geneva, the Asia-Pacific Committee in Ulaanbaatar, the meeting of SI Parliamentarians in conjunction with the 125th IPU Assembly in Bern, the Committee for Latin America and the Caribbean in Porto Alegre, Brazil, the Special Committee on the Arab World in Crete, the second meeting of the Working Group on Reform held in Marrakech, as well as meetings held in Paris, Helsinki and Athens in relation to the statutory committees of the SI and other SI matters.

£144,560 for costs of Socialist International Women.